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Horticulture Newsletter 2014, No. 42

10/21/2014

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Video of the Week:
Storing Tender Bulbs for the Winter

Turfgrass:
Control Broadleaf Weeds in Lawns in Late October - Early November

broadleaf weeds henbit and chickweed
Late October to early November is the most effective time to control broadleaf weeds in lawns. Dandelions usually produce a flush of new plants in late September, and the winter annual weeds henbit and chickweed should have germinated in October. These young plants are small and easily controlled with herbicides such as 2,4-D or combination products (Trimec, Weed-B-Gon, Weed-Out) that contain 2,4-D, MCPP and Dicamba. Even established dandelions are more easily controlled now than in the spring because they are actively moving materials from the top portion of the plant to the roots. Herbicides will translocate to the roots as well and will kill the plant from the roots up.

Choose a day that is 50 degrees or higher. The better the weed is growing, the more weed killer will be moved from the leaves to the roots. Cold temperatures will slow or stop this process. Weed Free Zone (also sold under the name of Speed Zone) contains the three active ingredients mentioned above, plus carfentrazone. It will
give a quicker response than the other products mentioned especially as temperatures approach 50 degrees. (Ward Upham)

Tree Leaves and Turf

leaves on turf
It's that time of year again. Leaves are rapidly falling from deciduous trees so it's a good time to stop and think about options for handling the litter. Although a scattering of leaves won’t harm the lawn, excessive cover prevents sunlight from reaching turfgrass plants.

Turf left in this state for an extended period will be unable to make the carbohydrates needed to carry it through the winter.

There are options for dealing with the fallen leaves other than bagging them up and putting them out for the trash collector. Composting is a great way to handle the refuse. Compost can then be used in the vegetable garden and flowerbeds. If you do not compost, you can mow leaves with a mulching mower and let shredded leaves filter into the turf canopy. (A side-discharge mower also will work, but it won't shred the leaves as thoroughly.) This method will be most effective if you do it often enough that leaf litter doesn’t become too thick. Mow while you can still see grass peeking through the leaves.

You may wonder whether this practice will be detrimental to the lawn in the long run. Research at Michigan State University in which they used a mulching mower to shred up to about one pound of leaves per square yard
of lawn (one pound is equal to approximately 6 inches of leaves piled on the grass) for five consecutive years, found no long-term effects of the shredded leaves on turf quality, thatch thickness, organic content of the thatch, or soil test results (pH, nutrients, etc.). If you mow leaves and have a cool-season lawn, it makes sense to be on a fall nitrogen fertilization program and core-aerate in the fall (things you should be doing anyway). If you have a warm-season lawn, you can still use this technique but wait to fertilize and core-aerate until next late
May or early June. (Ward Upham)

Vegetables:
Hardiness of Cool-Season Vegetables

spinach
Cool-season vegetables vary in cold tolerance, with some able to take colder temperatures than others.
Semi-hardy crops can take a light frost but are damaged by temperatures in the mid- to upper-20s. Examples include beets, Chinese cabbage, collards, Irish potatoes, Bibb lettuce, mustard, radishes, spinach, Swiss chard, and leaf lettuce. Covering these plants when cold weather threatens can help extend the harvest season.

Plants termed “hardy” can take lower temperatures but are damaged when the temperature drops to the low 20s. These include cabbage, broccoli, cauliflower, Brussels sprouts, carrots, turnips, and kale.

Certain root crops can essentially be stored outside even after the leaves have been damaged or killed by frost. Beets, carrots, potatoes and turnips can be mulched and harvested as needed until the soil starts to freeze in late November to December.Growing vegetables in Kansas can be a challenge, but we have an extremely long gardening season. We can harvest from early April (asparagus) to early December. Winter is a good time to plan and prepare for next year’s crops. (Ward Upham)

Winter Mulching of Vegetables

parsnips
We can extend the harvest season of some root crops such as beets, carrots, parsnips, and turnips by mulching to slow down soil freezing. Mulching allows harvest to continue much later than usual (usually mid- to late-December) when even mulched areas freeze hard.

Rhubarb is a shallow-rooted perennial crop that can also benefit from mulching to help stabilize soil temperatures. Plants that are not mulched may be heaved out of the ground by alternate freezing and thawing through the winter. Mulching moderates these temperature shifts and helps protect the plant. Mulch should be removed by mid-March so soil warming can encourage early emergence. (Ward Upham)

Miscellaneous:
What is the "Wild" Shrub with the Bright Red Berries

honeysuckle red berries
People in the eastern half of the state have been reporting shrubs with bright red berries growing wild. The berries are clustered around the stem and the leaves are still a bright green color. These are likely one of two species of bush honeysuckle, Amur or Tatarian. Each species can reach 6 to 20 feet tall.

This landscape shrub has become a serious understory invasive throughout the Midwest from eastern Kansas to Ohio. Many states have it on their noxious weeds list. All of our native honeysuckles are vines, similar to the vining Japanese honeysuckle. Amur and Tatarian honeysuckles are very noticeable in the spring as they put out leaves much earlier than most other trees and shrubs. Leaves also stay green much later into the fall. This long growing season gives it a competitive advantage over other native species, and the vigorous growth can take over a woodland understory, reducing the number of native woodland wildflowers and other shrubs. If you want to promote native species on your property, then controlling bush honeysuckles is needed. Honeysuckle seedlings can be readily hand pulled when the soil is damp. Chemical control is needed for larger infestations, as cutting alone results in vigorous resprouting. Foliar applications of glyphosate (i.e., Roundup) in late summer and fall works well as does applications of Crossbow (2,4-D + triclopyr). Treating cut stumps with Tordon RTU (picloram), or concentrated (20% - 50%) glyphosate is also quite effective. Several studies have shown basal spraying with triclopyr (Garlon) not to be effective, while basal applications with 2,4-D or picloram products work well, using an oil carrier to penetrate the bark. Please follow all label instructions when using pesticides. (Charlie Barden and Ward Upham)

My Oaks are Raining Worms

oak leaf marginal gall
Areas near Wichita, Kansas are receiving calls regarding tiny, white worms falling from pin oak trees. These worms are actually the larvae of the oak vein gall midge. A midge is a very small fly and therefore the larvae are maggots.
The larvae came from the vein galls that are on the pin oak leaves. Newly hatched larvae feed on the veins of
young leaves in the spring and cause a swelling and flattening of the veins. These maggots are now
dropping to the ground in order to pupate. Adults emerge early the next spring to start the cycle all over again. The midges apparently cause no damage. (Ward Upham)

Drip Irrigation for Community Gardens Publication Available

drip irrigation
A new publication that covers using drip irrigation for community gardens is now available. The publications covers low-pressure and high-pressure drip systems, water source and filtration, installation and monitoring soil moisture. You can find it at: http://www.ksre.ksu.edu/bookstore/pubs/MF3124.pdf



Contributors: Charles Barden, Extension Forester; Ward Upham, Extension Associate
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Horticulture Newsletter 2014 No. 25

6/24/2014

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Video of the Week:
Harvesting and Storing Onions

Vegetables:
Vegetables Produce Flowers But No Fruit

Picture
Picture
If you have vegetables that are blooming but not setting fruit, you may have a problem with flower pollination. There are several possible reasons for this that usually vary by species. One condition that can affect several species at the same time is overfertilization. Too much nitrogen causes the plant to emphasize vegetative growth, often to the detriment of fruit production. Overfertilization can lead to a delay in flower production and a decrease in fruit set among the flowers produced.

Squash, cucumbers, watermelon, and muskmelon can have a couple of other problems. First, the early flowers on these plants are usually all male. The production of both male and female flowers becomes more balanced as time passes. You can easily tell the difference between the two because only the female flower has a tiny fruit behind the blossom. If you have both, have not over-fertilized, and still have a problem, make sure you have pollinators. Look for the presence of bees visiting the plants. If you don't see any, try hand-pollinating several flowers. Use a painter’s brush to transfer pollen from the anther of the male flower to the stigma of the female flower. If you get fruit on only those flowers you pollinated, you need more pollinators. Make sure you aren't killing them with overuse of insecticides.

Tomatoes are wind pollinated and therefore not dependent on pollinators. But they have another possible problem, which is temperature. Tomatoes normally won't set if the night temperature is below 50 due to sparse pollen production. They also won't set when nighttime temperatures are above 75 degrees F and daytime temperatures are above 95 degrees F with dry, hot winds. (Ward Upham)

Fruit:
Strawberry Bed Renewal

Picture
Next year's strawberry crop will be affected by what you do to this year's strawberry bed. The sooner after harvest the patch is cleaned up, fertilized and irrigated, if possible, the better the chance of getting a good crop next year. One of the main goals in renovation is to provide a high level of sunlight to plant leaves so they can manufacture the food the plant needs. If leaves have disease spots, remove all the leaves in the bed. Removing these diseased leaves and weeds will cause new, non-diseased leaves to develop and remove competition from weedy plants. Hedge shears or even a mower can be used. Be sure the mower blade is high enough to avoid the strawberry crowns.

It is also important to reduce the number of strawberry plants so they do not compete for light, moisture and nutrients. If you have a small bed, you can hoe out or pull some plants so they are spaced about 4 to 6 inches apart. On large beds, adjust a rototiller so you can till between the rows, and cut each row back to about 10 inches wide.

The next step is to fertilize the plants with about 3/4 to 1 pound (3 to 4 cups) of a complete fertilizer such as 13-13-13 (nitrogen, phosphorus and potassium) or an equivalent on each 25 feet of row. If a soil test shows adequate levels of phosphorus and potassium, use 3/4 pound (1.5 cups) of a 16-0-0 (nitrate of soda) fertilizer per 25 feet of row instead. If nitrate of soda is unavailable, use the lawn fertilizer that contains about 30% nitrogen such as a 30-0-3, 28-0-3 or something similar. Make sure the lawn fertilizer does not contain a weed killer or preventer. These fertilizers should be used at the rate of 3/4 cup per 25 feet of row.

The next step is to irrigate to wash the fertilizer into the soil and provide moisture for the rapid growth of the strawberry plants. When the soil is dry, apply about 1 inch of water. A garden sprinkler can do a good job applying the water.

Controlling weeds and watering throughout the summer are important so plants are vigorous when fruit buds begin to develop in September and October. (Ward Upham)

Ornamentals:
One Plant, Two Plants, Red Plant, Blue Plant: Dr. Seuss-Inspired Gardening

Picture
Looking to add a bit of whimsy to your garden this year? I was recently on the hunt for a tree with interesting features that are a bit Dr. Seuss-like. You know, weeping habit, curvy trunks, pom-pom ball pruning…the whole nine yards.  I thought I’d share my finds with you in case you’ve got a curious child in your life that would really enjoy a fun plant.
I’m always interested in the actual plants, of course, but I think it’s interesting and worth noting how they grow the way they grow. Most interesting cultivars or varieties of ornamental plants are discovered by unusual growth called  “sports,” originate from a “witch’s broom,” involve unique traits on a seedling, hybrid or plant breeding resulting in polyploidism (bigger flowers, bigger fruit, but often brings sterility and cross fertilization incompatibility). However those unique traits are found, they are generally cloned (vegetative cuttings) and grafted onto more stable roots.

Of course there are always unique ways of pruning plants into topiaries as well, but let’s get into the plants.

If you’re looking all for a weeping tree, there are lots of choices. For starters, the redbud is a great plant for our region. You can’t go wrong with dark pink flowers in the spring and large, glossy, heart-shaped leaves in the summer.   Add a weeping feature and you’re in business. Popular weeping cultivars of redbud (Cercis canadensis)( are ‘Lavender Twist’ and ‘Ruby Falls.’ The latter has red/purple leaves in the summer.

Other deciduous weeping trees include Japanese Maple (Acer palmatum ‘Ryussen’), Mimosa (Albizia julibrissin ‘Pendula’), River Birch (Betula nigra ‘Summer Cascade’), European Hornbeam (Carpinus betulus ‘Pendula’), and Baldcypress (Taxodium distichum ‘Cascade Falls’ or ‘Falling Water’) just to name a few. Evergreen weeping plants can range from our native Eastern Redcedar (Juniperus virginiana ‘Pendula’) to Cedar of Lebanon (Cedrus  libani ‘Pendula’) and Atlas Cedar (Cedrus atlantica ‘Glauca Pendula’).

How about splendiferous plants with contorted stems and leaves? Corkscrew Willow (Salix matsudana ‘Tortuosa’) is a wonderful deciduous tree that fits the description. It’s just fascinating to look at all of the curly branches and stems. But this is a willow and it needs to be planted a good distance from your house and any water features. The roots of willow can be fairly invasive when looking for water sources.

In the shrub category, there is Harry Lauder’s Walkingstick (Corylus avellana ‘Contorta’). This is a fantastic plant for winter interest. In the summer it can be difficult to notice the uniquely contorted stems when the leaves cover the plant, but it’s a great specimen to bring some Dr. Seuss to leafless days. In the annuals category, a great plant for container gardens is Soft Rush (Juncus effusus). With cultivars like ‘Curly Wurly’, ‘Spiralis’ and ‘Unicorn’ you can be assured that someone will ask you about it.

How about pom pom type growth? Allium bulbs are great for this effect. They send up a single stalk with a round inflorescence at the top in spring and summer. There are many types with features ranging from size of the inflorescence, height of the stalk and color (purple to white). Smaller annual plants like Gomphrena have pom pom type inflorescences that are smaller, but more prolific. Great for containers or flower beds!

These plants are mostly what I’d call “specimen” plants and may be more difficult to find in the nursery than others. You may have to special order or mail order some of them, but they’re available. Hunting for plants for your Dr. Seuss plant collection or garden might just be the fun endeavor you’ve been looking for lately. (Cheryl Boyer)

“Be grateful you’re not in the forest in France
Where the average young person just hasn’t a chance
To escape from the perilous pants eating plants
But your pants are safe, you’re a fortunate guy
You ought to be shouting how lucky am I”
― Dr. Seuss, Did I Ever Tell You How Lucky You Are?

Pests:
Chiggers

Chigger
Chiggers are mites, not insects. And like all mites, the adults have eight legs.  However, the larva only has six legs.

Though the bright red female adult is tiny (about 1/20th of an inch) the larva is much smaller (about 1/150th of an inch). Only the larvae are parasitic and attack animals. The larva injects digestive juices into the skin, which causes a rapid swelling. In the center of the swelling is a "feeding tube" from which the chigger sucks out liquefied skin cells. Feeding usually continues for 2 to 4 days.

Protection from chiggers uses two approaches. The use of a repellent can discourage chiggers from attacking. The most effective repellents are Deet and permethrin. Both are applied to clothing. The second approach seeks to reduce chigger populations. Keeping the lawn mowed regularly can help, but large populations may require the use of an acaricide. Effective products include bifenthrin (Talstar, Hi-Yield Bug Blaster II, Hi-Yield Bug Blaster Bifenthrin, and Ortho Lawn Insect Killer Granules), cyfluthrin (Tempo 20, Bayer Vegetable & Garden Insect Spray) and carbaryl (Sevin). For more information, see the K- State Research and Extension publication titled, “Chiggers” at: http://www.ksre.ksu.edu/bookstore/pubs/MF2107.PDF     (Ward Upham)

Miscellaneous:
New Publications Available

Picture
Several new publications have been released recently that should be helpful to gardeners.

Harlequin Bug
(MF3135) - A destructive pest of vegetable crops, especially the cole crops such as broccoli, cabbage and cauliflower.

Japanese Beetle (MF3151) -   Though this insect became established in Kansas in 1992, it remained confined to certain areas of the state for a number of years.  However, populations have been increasing and new areas are becoming infested.   Japanese beetle has a very wide host range (reportedly 300 to 400 plant species) including many vegetables, fruits and ornamentals.

Spotted Wing Drosophila (MF3158) - First detected in Kansas in 2013, this pest of fruit can attack a wide variety of small fruit including blackberries, blueberries, boysenberries, raspberries, strawberries, and grapes. Raspberries appear to be more susceptible than blackberries, blueberries, and strawberries.  Tree fruit such as apples, cherries, figs, nectarines, peaches, persimmons, and plums can also be attacked.

Tree and Shrub Problems in Kansas: Diseases, Insects, and Environmental Stresses (MF3132) - We have mentioned this one before but wanted to highlight it again as it is a very valuable resource.  This is a 92-page publication with 116 color images to help with identification. (Ward Upham)

Stinkhorn Mushrooms

Stinkhorn mushroom
These finger-shaped mushrooms live up to their name.  As they mature, they become extremely foul smelling.  The odor is reminiscent of rotting meat or, in some cases, of what a dog leaves behind after it has done its “business.”

Stinkhorn mushrooms live on dead organic matter such as is found in mulched areas (especially bark mulch), fields or in yards.  The finger-like fruiting body arises from a sac-like structure at the base.  A slimy spore mass eventually develops at the tip of the stalk.  It is the spore mass that causes the odor.  This spore mass also attracts flies which help spread the spores to new areas.

The question always comes up on how to prevent or control these mushrooms.  Since the main part of the fungus, the mycelium, is underground there isn’t anything you can do but remove the mushrooms as they appear.  Remember the mushroom is the fruiting body of the mushroom and it is the mycelium that must be controlled to prevent the mushrooms.  (Ward Upham)

Contributors: Cheryl Boyer, Nursery Crops Specialist; 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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