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Horticulture Newsletter 2016, No. 33

8/16/2016

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Video of the Week:
Storing and Preserving Peppers​

Turfgrass:
Preparations for Fall Lawn Plantings

Fall grass seeding
If you are planning on overseeding or establishing a Kentucky bluegrass or tall fescue lawn this fall, preparations should start now.  These preparations include taking a soil test and controlling weeds if necessary.
 
A soil test will determine what nutrients are needed. Unless phosphorus levels are high, a starter fertilizer is recommended to encourage rapid germination of grass seed.  Once the soil test results are received, the proper fertilizer can be purchased so it can be applied at seeding.
 
Many areas of Kansas have received sufficient rainfall this summer that weeds, especially crabgrass, may interfere with seeding.  If a lawn is being completely redone and weeds are a problem, a product with glyphosate such as Roundup or Killzall can be used to kill everything. Glyphosate is inactivated when it hits the soil and will not be taken up by underground roots. Avoid spraying exposed roots or leaves of any “good” plant.  Wait at least two weeks before seeding.
 
Overseeding is used to thicken up a lawn.  Normally we have bare spots that need to be filled in or a thin lawn that needs thickened up.  We do not kill the tall fescue or bluegrass when overseeding.  Therefore, we cannot use glyphosate to control weeds as it would also kill the turfgrass.  Instead we use a selective herbicide that will control both broadleaf weeds and crabgrass.  A number of those are listed below.  Note that there is a waiting period between when the herbicide is applied and when it is safe to overseed.  Usually this is about four weeks. However, check the label of the product you purchased to be sure you allow enough time.

Ortho Weed B Gon Max + Crabgrass Control
Bayer All in One Lawn Weed and Crabgrass Killer. Fertilome Weed Out with Q
Trimec Crabgrass Plus Lawn Weed Killer
Bonide Weed Beater Plus Crabgrass & Broadleaf Weed Killer
Spectracide Weed Stop for Lawns Plus Crabgrass Killer
(Ward Upham)

Turf in Shade

turf in shade
We are often asked, “What’s the best shade grass for Kansas?” The answer is simple but requires explanation. Tall fescue is the best shade grass for Kansas. That does not mean that tall fescue is the best shade grass of all those grown. True fine leaf fescues such as sheep’s fescue, hard fescue, and creeping red fescue are actually better adapted to shade than tall fescue, but they have difficulty surviving Kansas summers. It might be better to say that tall fescue is the best shade grass adapted to Kansas conditions.

Although tall fescue is our best shade grass that does not mean that tall fescue is all that good in the shade. Large trees that produce deep shade will not allow tall fescue to survive over the long term. I say “over the long term” because fall-planted cool-season grasses will often do well under shade trees through the fall and spring when there is less leaf cover and growing conditions are better (cooler and moister) than in the summer. We often see people plant tall fescue in the shade each fall and then wonder what happens the following summer. The answer is stress from multiple fronts. Sunlight that passes through the leaves of trees has had most of the “good” light that drives photosynthesis stripped out. The grass struggles to make the food it needs for survival and growth. When this poor diet is combined with the additional stresses of drought and heat, tall fescue is unable to survive.
 
So, what should you do if you have too much shade for your turf? You have three choices. Reduce the shade by pruning up the lower branches of your trees so more early and late sun reaches the turf. This is not practical with many trees because it can destroy the desired shape. A second option is to plant a groundcover that is well-adapted to shady sites such as periwinkle. Another solution would be to mulch the area under the tree. (Ward Upham)

Flowers:
Peonies May Be Cut Back Now

Peonies browning
Peonies often look a little bedraggled by this time of year and gardeners may want to cut them back. That will not be a problem with this perennial. Peonies are essentially dormant by this time of the year, even though leaves may still be green. Cut leaves off close to the ground and compost or discard. (Ward Upham)

Fruit:
Pear Harvest

pear ripening
Pears should not be allowed to ripen on the tree. They should be picked while still firm and ripened after harvest. Tree-ripened fruits are often of poor quality because of the development of grit cells and the browning and softening of the inner flesh. Commercial growers determine the best time to harvest pears by measuring the decrease in fruit firmness as the fruit matures. This varies with growing conditions and variety. A Magness meter is used for testing and measures the pressure needed to push a 5/16-inch tip a specified distance into an individual fruit. Home gardeners can use these other indicators:
 
1. A change in the fruit ground color from a dark green to light green or yellowish green. The ground color is the "background" color of the fruit.

2. Fruit should part easily from the branch when it is lifted up and twisted.
 
3. Corking over of lenticels. Lenticels are the "breathing pores" of the fruit. They start out as a white to greenish white color and turn brown due to corking as the fruit nears maturity. They look like brown “specks” on the fruit.
 
4. Development of characteristic pear aroma and taste of sampled fruit.
 
Pears ripen in one to three weeks after harvest if held at 60 to 65 degrees F. They can then be canned or preserved. If you wish to store some for ripening later, fresh-picked fruit should be placed in cold storage at 29 to 31 degrees F and 90 percent humidity. Ripen small amounts as needed by moving them to a warmer location and holding them at 60 to 65 degrees F. Storing at too high a temperature (75 degrees F and higher) will result in the fruit breaking down without ripening. (Ward Upham)

Pests:
Codling Moth Control: The Worm in the Apple

codling moth worm in apple
If you grow apples, you are familiar with the worm that often gets into the fruit. By far, the most common worm found in apples is from the codling moth. The traditional control for homeowners has been malathion. Though carbaryl (Sevin) is also labeled and effective, its usage in Kansas often leads to a spider mite outbreak as it kills mite predators.
 
So, that leaves malathion. Unfortunately, malathion is becoming more and more difficult to find with a label for
apples. Peaches and pears are still listed on most labels but apples and various small fruits are found on very few. As a matter of fact, the only product I have found with malathion that still has apples and a number of small fruits on the label is Bonide Malathion Insect Control.
 
What do we use as a homeowner instead of malathion?  Sevin is often not a good choice in Kansas due to a likely mite outbreak. Fortunately, we do have a new product labeled for homeowners that is reasonably effective.  It is an organic product known as CYD-X and is a codling moth virus. This is exciting news for homeowners who grow organically as they have had little to choose from for codling moth control. Though there were a few other organic products labeled for codling moth, effectiveness was wanting. How effective is CYD-X?
 
Utah State University did a study comparing the relative effectiveness of codling moth products. In their study, Sevin gave 89% control, malathion gave 77% and CYD-X turned in 69% control. Though CYD-X was not as good as malathion or Sevin, the level of control given is still very reasonable.
 
CYD-X is still quite new and not widely available. If you can’t find it locally, Peaceful Valley Farms has it available online.  The cost is $49.99 for 1.5 ounces.  The suggested rate is 1 teaspoon per 5 gallons of water.  If you do your math, the cost per applied gallon is a bit more than one dollar. The spray interval is every week on the label though the study mentioned above applied every two weeks.  Usually your first spray goes on about 3 weeks after full bloom.  (Ward
Upham)

Twig Girdlers

Girdled twig
We are starting to see damage from twig girdlers as evidenced by fallen twigs up to 3 feet long. The beetle Oncideres cingulata is most likely the culprit. Host trees include elm, oak, linden, hackberry, apple, pecan, persimmon, poplar, sour gum, honey locust, dogwood, and some flowering fruit trees. This insect is distributed throughout the eastern United States from New England to Florida and as far west as Kansas and Arizona. Adults are long-horned beetles with a grayish-brown bodies that are stout and cylindrical. The larvae are also cylindrical with small heads and shiny exteriors. Larvae can be up to an inch long and are light brown to brownish-gray.
 
Girdled twigs often remain on the tree until a strong wind blows them down. Large infestations can result in a high percentage of girdled twigs. Though this may reduce the vigor and appearance of the tree, the overall effect on the tree's health is not severe. Twigs are unsightlyand do not fall all at once, so clean up is a drawn out process.
 
This beetle has a one-year life cycle. Late in the growing season, the female deposits eggs in small scars chewed through the bark and then chews a continuous notch around the twig, girdling it. The notch is cut below the site of egg deposition apparently because the larva is unable to complete development in the presence of large amounts of sap. Girdled twigs die and fall to the ground where the eggs hatch.
 
Girdled twigs look like a beaver has chewed on them, only in miniature. The outside of the twig is smoothly cut, but the center of the twig appears broken. The larvae begin feeding on dead wood inside the twigs the following spring and continue through most of the summer. Pupation takes place inside the feeding cavity. Development is completed during August when the adult emerges to repeat the cycle.

Though adults feed on the bark of host twigs, damage is minimal until the female starts girdling. Chemical control is impractical, so gather and dispose of fallen twigs in the fall or spring to destroy the larvae inside. Often, natural mortality is high because fallen twigs are excessively dry or carry too many larvae per twig. (Ward Upham)

Contributors: Ward Upham, Extension Associate

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Horticulture Newsletter 2015, No. 38

9/22/2015

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Video of the Week:
Protecting Fruit Trees from Deer

Flowers:
Time to Plant Spring Flowering Bulbs

Planting spring bulbs
Late September through October is an excellent time to plant spring-flowering bulbs such as crocus, tulips, and daffodils. These plants need to develop roots in the fall and must meet a chilling requirement over the winter in order to bloom in the spring. 

Choose a planting site that has full sun to partial shade. The ideal soil would be a sandy loam, but even poor soils can be used if organic material such as peat moss, compost, or aged bark is mixed in. For example, a heavy clay can be amended by mixing in one-third to one-half organic material. Soil pH should be between 6.0 and 7.0. 

Bulbs need good aeration as well as good drainage for proper development. It is best if the bulbs are given 12 inches of prepared soil. If one-third organic material were added, this would require mixing 4 inches of organic material with 8 inches of soil. Incorporate about 3 pounds of a complete fertilizer such as a 5-10-5 per 100 square feet during preparation or fertilize according to soil test. 

Planting depths vary depending on the size of the bulbs. For example, tulips and hyacinths are set about 6 inches deep, and daffodils are put 6 to 8 inches deep. Smaller bulbs are planted shallower. As a rule of thumb, bulbs are planted two to three times as deep as their width. Planting depth is the distance from the bottom of the bulb to the top of the soil. Large bulbs are normally spaced 4 to 6 inches apart, and small bulbs about 1 to 2 inches. Planting in clumps or irregular masses produces a better display than planting singly. 

After placing the bulbs at the proper depth, replace half the soil and add water. This will settle the soil around the bulbs and provide good bulb/soil contact. Add the remaining soil and water again. Although there will be no top growth in the fall, the roots are developing, so soil needs to be kept moist but not wet. Mulch can be added after the soil has frozen to prevent small bulbs from being heaved out of the soil by alternate freezing and thawing. (Ward Upham)

Bringing Amaryllis Back into Bloom

Amaryllis
With proper care, amaryllis will bloom year after year. Bring the pot in before the first frost and place in a dark location. Withhold water so leaves have a chance to dry completely. Then cut them off close to the top of the bulb. Amaryllis needs to rest for at least a month before the plant is started back into growth. It takes an additional six to eight weeks for the plant to flower. When you are ready for amaryllis to resume growth, water thoroughly and place the plant in a warm, sunny location. Do not water again until the roots are well developed because bulb rot is a concern. 

Amaryllis needs temperatures between 50 and 60 degrees during the period before flowering. Higher temperatures can weaken leaves. The flower bud may start to appear right away or the plant may remain dormant for a period of time, but eventually all mature bulbs do bloom if they have been given proper care during the growing season. Keep the plant in a cool location and out of direct sunlight when the flower buds begin to show color so that the flowers last longer. Amaryllis can remain in bloom for about a month. (Ward Upham)

Vegetables:
Rotation of Vegetable Crops

Vegetable garden
Rotating vegetable crops is a standard way of helping prevent disease from being carried over from one year to the next. Rotation means that crops are moved to different areas of the garden each year. Planting the same crop, or a related crop, in the same area each year can lead to a build-up of disease. Also, different crops vary in the depth and density of the root system as well as extract different levels of nutrients. As a rule, cool-season crops such as cabbage, peas, lettuce and onions have relatively sparse, shallow root systems and warm-season crops such as tomatoes, peppers and melons have deeper, better developed root systems. Therefore, it can be helpful to rotate warm-season and cool-season crops. 

As mentioned earlier, it is also a good idea to avoid planting closely related crops in the same area as diseases may be shared among them. For example, tomatoes, potatoes, peppers and eggplant are closely related. Also, broccoli, cauliflower, cabbage and brussels sprouts share many characteristics in common. Therefore, do not plant cabbage where broccoli was the previous year or tomatoes where the peppers were. 

So, why is this important to bring this up in the fall? Now is the time to make a sketch of your garden so that the layout is not forgotten when it is time to plant next year. (Ward Upham)

Pests:
Be on the Lookout for Goldenrod Soldier Beetles

Goldenrod Soldier Beetle
If you haven’t noticed yet, hordes of goldenrod soldier beetle (Chauliognathus pennsylvanicus) adults are feeding on goldenrod (Solidago spp.) and other flowering plants such milkweed (Asclepias spp.). Adults are extremely abundant feeding on the flowers of chive (Allium Schoenoprasum), and can also be seen feeding on linden trees (Tilia spp.) when in bloom. In fact, adults may be observed both feeding and mating (occasionally at the same time). The goldenrod soldier beetle is common to both the western and eastern portions of Kansas. 

Adults are about 1/2 inch (12 mm) in length, elongated, and orange in color with two dark bands on the base of the forewings (elytra) and thorax (middle section). They are typically present from August through September. Adult soldier beetles feed on the pollen and nectar of flowers, but they are also predators and may consume small insects such as aphids and caterpillars. Flowers are a great place for the male and female soldier beetle adults to meet, get acquainted, and mate (there is no wasting time here). Soldier beetle adults do not cause any plant damage. Sometimes adults may enter homes; however, they are rarely a concern. The best way to deal with adults in the home is to sweep, handpick, or vacuum. 

Adult females lay clusters of eggs in the soil. Larvae are dark-colored, slender, and covered with small dense hairs or bristles which gives the larvae a velvety appearance. Larvae reside in the soil where they feed on grasshopper eggs; however, they may emerge from the soil to feed on soft-bodied insects and small caterpillars. (Raymond Cloyd) 

Twig Girdler

twing girdler damage
If you look at a twig girdler, you can see that it is well-equipped for the girdling task. The head is compressed from front to back, and somewhat elongate from top to bottom ---- just right for allowing it to fit into the V-shaped girdle it creates. Under magnification, her mandibles resemble the “jaws-of-life” rescue equipment ---- stout and strong, ready to cut/girdle branches ranging in size from 6 to 13 mm in diameter. Depending on the size of the individual female beetle whose legs are uniquely positioned, her 4 front legs encircle/grasp and her hind legs are positioned rearward and utilized to anchor against. 

The girdling process is not a complete shearing of branches. Rather, the smooth cut stops, but an intact central core remains, thus preventing the branch from dropping. However, because girdling severs vascular elements, the portion of the branch beyond the girdle dies and dries out. This results in the central core becoming brittle. It is at this point the weight of the branch (with or without the aid of the wind) overcomes the ability of the core to support the branch. The core snaps and the branch falls to the ground. 

Twig girdlers have a wide host range including hickory, pecan, dogwood, honeylocust, oak, maple and hackberry. While hackberry is listed as “high” on the list of hosts, in Kansas, most reports of littered lawns occur beneath elms. This preference for elm over hackberry was exemplified in an observation of side-by-side girdled elms and untouched hackberry trees. 

For homeowners, twig girdlers are more of a nuisance in causing the aforementioned branch litter. The recommendation is to gather up and dispose of branches. This will eliminate those beetles which emerge the following year. However, this does not mean that twig girdlers won’t appear the following year. Look up and you may see many more dead branches still attached or caught up in tree canopies. (Bob Bauernfeind) 

Miscellaneous:
Why do Houseplants Lose Leaves after Being Brought Inside?

houseplant yellowing
Newly bought houseplants or those brought in from outside often lose their leaves. In order to understand why this occurs, we need to look at how these plants are grown and what the plant needs to do to adapt to its new environment. Houseplants are normally produced either under shade outdoors in southern states or in greenhouses. Also, many homeowners move their houseplants outside during the summer. Regardless, the plants receive much more sunlight than they do in an indoor environment. 

Research done in Florida in the late 1970s revealed that tropical plants grown under high light conditions produce "sun leaves" while those grown under low light conditions have "shade leaves." These leaf types differ structurally in that sun leaves have less chlorophyll (the substance that plants use to convert sunlight to energy) and the chlorophyll that is present is located deeper inside the leaf. Sun leaves also tend to be thick, small and numerous while shade leaves are more thin, larger, and fewer in number. 

When plants are moved from one light condition to another they need time to adjust. This process is known as acclimatization. If they are forced to acclimatize too quickly, they will drop their sun leaves and produce a new set of shade leaves. If the acclimatization process is slower and less drastic, the plant can convert their sun leaves to the shade leaves that do better under low light. If going from shade to sun, this process is reversed. Some houseplants are acclimatized before they are sold but many are not.

So how do we help our new houseplants or those moved inside acclimatize to their new home environment? Houseplants should start out in an area of the home that receives plenty of light and then gradually moved to their permanent, darker location. This process should take 4 to 8 weeks depending on the degree of difference in light levels between the initial and final location of the plant. Remember, plants need to be acclimatized whether they are moved from a sunny location to one that receives less light or from shade to sun. Understanding plant processes allows us to anticipate potential problems. Acclimatization gives our houseplants a greater chance of retaining leaves and avoiding the stress of completely replacing them. (Ward Upham) 

Contributors: Bob Bauernfeind, Entomologist; Raymond Cloyd, Entomologist; Ward Upham, Extension Associate 

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Horticulture Newsletter 2014, No. 37

9/16/2014

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Video of the Week:
Cuttings to Grow Inside for the Winter

Turfgrass:
Lawn Seeding Deadline Nears

Picture
September is the best month to reseed cool-season lawns such as tall fescue and Kentucky bluegrass. However, you can get by with an early to mid-October planting for tall fescue. October 15 is generally considered the last day for safely planting or overseeding a tall fescue lawn in the fall. If you do attempt a late seeding, take special care not to allow plants to dry out.  Anything that slows growth will make it less likely that plants will mature enough to survive the winter.

Seedings done after the cut-off date can be successful, but the success rate goes down the later the planting date. Late plantings that fail are usually not killed by cold temperatures but rather desiccation. The freezing and thawing of soils heave poorly rooted grass plants out of the ground, which then dry and die. Keeping plants watered will help maximize root growth before freezing weather arrives. (Ward Upham)

Ornamentals:
Planting Trees in the Fall

Picture
The fall season can be an excellent time to plant trees. During the spring, soils are cold and may be so wet that low oxygen levels inhibit root growth. The warm and moist soils associated with fall encourage root growth. Fall root growth means the tree becomes established well before a spring-planted tree and is better able to withstand summer stresses. However, certain trees do not produce significant root growth during the fall and are better planted in the spring. These include beech, birch, redbud, magnolia, tulip poplar, willow oak, scarlet oak, black oak, willows, and dogwood.

Fall-planted trees require some special care. Remember, that roots are actively growing even though the top is dormant. Make sure the soil stays moist but not soggy. This may require watering not only in the fall but also during the winter months if we experience warm spells that dry the soil. Mulch also is helpful because it minimizes moisture loss and slows the cooling of the soil so root growth continues as long as possible. Evergreens should be moved earlier in the fall than deciduous plants. They need at least six weeks before the ground freezes for the roots to become established. (Ward Upham)

Miscellaneous:
Adding Organic Materials Directly to the Garden

Picture
If the severe summer weather has brought an early end to your garden, consider adding organic materials directly to the soil rather than composting. Materials such as residue from lawn renovation, rotted hay, or rotted silage can be added and then tilled in. Coarser materials such as tree leaves or garden residue should be shredded. A lawn mower with a bagging attachment can be used to shred this material and collect it in one operation.

Organic materials can be spread to a depth of about 3 inches and tilled in. Be sure the soil is not too wet before tilling.  During warm weather, the material will decompose quickly and the process can be repeated every two weeks. Later in the fall, it may take longer. This process can be repeated from now until late November to early December.

Remember that organic matter helps almost any soil. It improves clay soil by improving tilth, aeration and how quickly the soil takes up water. In sandy soils, it acts as a sponge by holding water and nutrients. (Ward Upham)

Garlic Planting Time

Picture
October is a good time to plant garlic (Allium sativum) if you want large quality cloves next summer. Apply 3 pounds of 10-10-10 fertilizer per 100 square feet and mix into the soil before planting or fertilize according to soil test. Plant individual cloves point up and spaced 6 inches apart and 1 to 2 inches deep. The larger the clove planted, the larger the bulb at harvest. Water in well and mulch with straw to conserve soil warmth and encourage good establishment. Harvest will not occur until next summer.  Test dig when the lower 1/3 of the foliage is yellow.  If the cloves have segmented, it is time to harvest.  If they haven't segmented, wait another week or two.

Elephant garlic (Allium ampeloprasum) should also be planted now. It is a plant with a milder garlic flavor and is actually a closer relative to the leek than to true garlic. (Ward Upham)

Moving Houseplants Inside for the Winter

Picture
Many people with houseplants move some of them outside for the summer to give them better growing conditions and help them recover from the stress of an indoor environment. But as fall approaches and night temperatures approach 50 F, it is time to think about bringing plants inside for the winter.

Plants that have spent the summer outside should be inspected for insects and disease before bringing them inside. A sharp spray from a garden hose can remove insects or mites from houseplant foliage.

Insects in the potting soil can be forced out by soaking the pot in a tub of lukewarm water for about 15 minutes.

Houseplants that have been kept outdoors are accustomed to receiving much more sunlight than they do indoors. So how do we help houseplants acclimatize to the lower light levels inside? Houseplants brought in from outside should be started out in an area of the home that receives plenty of light, and then gradually moved to their permanent, darker location. This process should take four to eight weeks depending on the degree of difference in light levels between the initial and final location of the plant.

Understanding plant processes allows us to anticipate potential problems. Acclimatization gives houseplants a greater chance of retaining leaves and avoiding the stress of completely replacing them. (Ward Upham)

Pests:
Twig Girdlers

Picture
We are starting to see damage from twig girdlers as evidenced by fallen twigs up to 3 feet long. The beetle Oncideres cingulata is most likely the culprit. Host trees include elm, oak, linden, hackberry, apple, pecan, persimmon, poplar, sour gum, honey locust, dogwood, and some flowering fruit trees. This insect is distributed throughout the eastern United States from New England to Florida and as far west as Kansas and Arizona. Adults are long-horned beetles with a grayish-brown bodies that are stout and cylindrical. The larvae are also cylindrical with small heads and shiny exteriors. Larvae can be up to an inch long and are light brown to brownish-gray.

Girdled twigs often remain on the tree until a strong wind blows them down. Large infestations can result in a high percentage of girdled twigs. Though this may reduce the vigor and appearance of the tree, the overall effect on the tree's health is not severe. Twigs are unsightly and do not fall all at once, so clean up is a drawn out process.

This beetle has a one-year life cycle. Late in the growing season, the female deposits eggs in small scars chewed through the bark and then chews a continuous notch around the twig, girdling it. The notch is cut below the site of egg deposition apparently because the larva is unable to complete development in the presence of large amounts of sap. Girdled twigs die and fall to the ground where the eggs hatch.

Girdled twigs look like a beaver has chewed on them, only in miniature. The outside of the twig is smoothly cut, but the center of the twig appears broken. The larvae begin feeding on dead wood inside the twigs the following spring and continue through most of the summer. Pupation takes place inside the feeding cavity. Development is completed during August when the adult emerges to repeat the cycle.

Though adults feed on the bark of host twigs, damage is minimal until the female starts girdling.  Chemical control is impractical, so gather and dispose of fallen twigs in the fall or spring to destroy the larvae inside. Often, natural mortality is high because fallen twigs are excessively dry or carry too many larvae per twig. (Ward Upham)

Contributors: Ward Upham, Extension Associate

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    Authors

    Ward Upham runs the Horticulture Response Center in the Department of Horticulture and Natural Resources at Kansas State University. Other contributors include K-State Extension Specialists.

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