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Miscellaneous: Slime Molds

6/13/2017

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Picture
Picture
Slime molds are primitive organisms that are common on turf and mulch. Slime molds are not fungi and are no longer classified as such. They belong to the Kingdom Protista rather than Kingdom Fungi. On turf, you might often see large numbers of small gray, white or purple fruiting structures, called sporangia on leaf blades during cool and humid weather throughout spring, summer, and fall. Affected areas are often several inches to 1 foot in diameter. During wet weather, the fruiting structures may appear slimy. As the structures dry out in hot weather, they become ash gray and break up easily when touched.
       
Homeowners often are concerned that this is a disease organism that will kill the grass, but slime mold feeds on bacteria, other fungi, and dead organic matter. It simply uses the turf as a structure on which to grow. However, slime mold can damage turf by completely covering leaf blades and interfering with photosynthesis. Chemical control of slime molds is not necessary. Use a broom or a heavy spray of water to dislodge the mold.
       
Slime molds on mulch often attract attention because of their bright colors and disgusting appearance. Common names are often quite descriptive. For example, the "dog vomit" slime mold is a bright, whitish color that resembles its namesake. It eventually turns brown and then into a hard, white mass. There is also the "scrambled egg" slime mold, "the yellow blob" slime mold and the "regurgitated cat breakfast" slime mold. Slime molds do not hurt anything, but most people do not find them attractive and want to get rid of them. Simply use a shovel to discard the offensive organism and then stir up the mulch for aeration. (Ward Upham)
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Horticulture Newsletter 2015, No. 25

6/23/2015

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Video of the Week:
Water Wise Way to Irrigate Trees

Upcoming Events:

K-State Bedding Plant Field Day
Tuesday, July 21, 2015
For more information, go to: http://www.hfrr.ksu.edu/doc4321.ashx

Kansas Turf & Ornamentals Field Day
Thursday, August 6, 2015
For more information, go to:  Turf Field Day

Turfgrass:
Grub Control in Lawns

grub
If you plan on using a grub preventative on your lawn, the first half of July is a good target date for most products. Preventatives are normally used on areas that have had a history of grub problems. Traditional grub insecticides such as Dylox or carbaryl (Sevin) are normally applied in late July after grubs are present or as a rescue treatment once damage is seen. Products that contain Merit (imidacloprid) are considered grub preventers.  Actually, these products do not prevent grubs, but rather kill grubs when they are quite small, and long before they cause damage. Merit is safer to use around pets and humans than traditional grub killers. Merit can be found in Bayer's Season-Long Grub Control, Grub No-More and Grub Free Zone.

Another grub preventer with the trade name GrubEx contains chlorantraniliprole. Though this product is very effective, it is less water soluble than imidacloprid. It should be applied earlier, preferably April or May, but applications through June should still be effective. Remember, all grub products should be watered in soon after application. (Ward Upham)

Slime Molds

slime mold
Slime molds are primitive organisms that are common on turf and mulch. Slime molds are not fungi and are no longer classified as such. They belong to the Kingdom Protista rather than Kingdom Fungi. On turf, you might often see large numbers of small gray, white or purple fruiting structures, called sporangia on leaf blades during cool and humid weather throughout spring, summer, and fall. Affected areas are often several inches to 1 foot in diameter. During wet weather, the fruiting structures may appear slimy. As the structures dry out in hot weather, they become ash gray and break up easily when touched.

Homeowners often are concerned that this is a disease organism that will kill the grass, but slime mold feeds on bacteria, other fungi, and dead organic matter. It simply uses the turf as a structure on which to grow. However, slime mold can damage turf by completely covering leaf blades and interfering with photosynthesis. Chemical control of slime molds is not necessary. Use a broom or a heavy spray of water to dislodge the mold.       

Slime molds on mulch often attract attention because of their bright colors and disgusting appearance. Common names are often quite descriptive. For example, the "dog vomit" slime mold is a bright, whitish color that resembles its namesake. It eventually turns brown and then into a hard, white mass. There is also the "scrambled egg" slime mold, "the yellow blob" slime mold and the "regurgitated cat breakfast" slime mold. Slime molds do not hurt anything, but most people do not find them attractive and want to get rid of them. Simply use a shovel to discard the offensive organism and then stir up the mulch for aeration. (Ward Upham)

Fruit:
Strawberry Bed Renewal

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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)

Vegetables:
Vegetables Produce Flowers But No Fruit

watermelon female flower
watermelon male flower
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)

Pests:
"Miller Moths" = Army Cutworm Moths

moths
A “miller moth" is an all-inclusive umbrella term used to describe any plain brown drab moth.  At this time of year, the "miller moths"  are army cutworm moths, Euxoa auxillaris.

Upon close examination, army cutworm moths definitely are not plain, brown or drab. There are 5 morphological forms (varieties) of army cutworm moths. Each possesses its own intricate and distinctive wing pattern. Adding more to the visual array, brown forms of each variety are males, whereas grayish individuals are females.

The seasonal life history begins in the fall of the year when moths deposit eggs in the soil in fields of fall-seeded wheat, alfalfa stands and weedy fields/patches. Eggs may hatch within several days of being deposited  but may be delayed under unfavorable/dry conditions. Larvae preferably feed during the dark of night and seek shelter in the soil during daytime hours. Army cutworms overwinter as partially grown larvae.

Each year in the Central Plains states, overwintered army cutworm larvae resume their feeding as temperatures moderate and become warmer. They complete their development toward the beginning of May after which they burrow into the ground where they create protective earthen cocoons inside of which they pupate.

Moth emergence usually begins by late May.   For a period of time, moths remain near areas where they emerged. Then an undefined stimulus (likely photoperiod driven) signals moths across the Central Plains states to migrate westward to the higher elevations in the Rockies. There in the cool-of-summer, they feed, accumulate body fat and attain sexual maturity. In mid- to late September, they migrate back to the Central Plains where they deposit eggs to initiate the next generation of army cutworms.

The current complaints revolve around the moths. Again, because moths are active during evening hours, they shun daylight. That is, with the approach of daylight, army cutworm moths seek shelter/cover in any conceivable space. Excluding moths is difficult because they will exploit very small openings.

Another interesting tidbit about army cutworm moths is that they are food for grizzly bears. During summer months, bears move to the higher elevations to feast on army cutworm moths. It was determined that a single moth possesses ½  calorie of fat content. It was further estimated that a bear obtains 20,000 calories of fat on a daily basis by consuming 40,000 moths per day. (Bob Bauernfeind)

Miscellaneous:
Vinegar as an Herbicide

young weeds
We often hear of home remedies that have not been scientifically tested. Vinegar has been suggested as an effective herbicide, but until recently it had not been studied for effectiveness. The USDA's Agricultural Research Service has finally put vinegar to the test. They used concentrations of varying strengths including 5, 10 and 20 percent. Household vinegar is close to a 5 percent solution. Weeds tested included lambs-quarters, giant foxtail, velvetleaf, smooth pigweed and Canada thistle.

Weeds were hand-sprayed so that the leaves were uniformly coated with material. Young plants within the first two weeks of life were killed with the 5 and 10 percent solution. Higher concentrations provided 85 to 100 percent kill regardless of the size of the weed. Canada thistle proved to be exceptionally susceptible to vinegar. The 5 percent solution gave 100 percent kill of top growth. Vinegar sold as a herbicide is most often a 20% solution.

Note that all weeds tested were annuals except the thistle. Vinegar is not translocated, so it would burn the top growth of perennials but would be unlikely to kill established plants. Vinegar is commonly made from wine, cider or malt, though a wide variety of materials can be used. This study included only vinegar made from fruits or grains, so it conforms to organic farming standards. (Ward Upham)

Contributors: Ward Upham, Extension Associate

To view Upcoming Events: http://tinyurl.com/fswqe          

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Horticulture Newsletter 2014 No. 27

7/8/2014

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Video of the Week:
Common Tomato Problems, Part 2

Turfgrass:
Bermudagrass Control

Picture
Bermudagrass can make a nice lawn if you don't mind its invasiveness and short growing  season. But many people dislike both these characteristics. Warm-season grasses, such as bermudagrass, zoysiagrass and buffalograss, green up later than cool-season grasses such as tall fescue and Kentucky bluegrass. They also go dormant earlier in the fall, which can make a lawn unattractive. Bermuda that invades a cool-season lawn will be brown during much of the spring and fall while the rest of the lawn is green. And it is much more drought and heat resistant than cool-season grasses, so it will take over a cool-season lawn during the summer months if it is in full sun. So how do you control bermudagrass that has invaded a cool-season lawn? Research conducted in 1996 showed that glyphosate (Round-up, Kleen-up, Killzall, Kleeraway) is the best herbicide for the job. Glyphosate is a nonselective herbicide and will kill everything— including tall fescue or Kentucky bluegrass. You will need to reseed treated areas.  In our study, we applied a 2% solution of glyphosate on July 15 and again on August 15 on a bermudagrass plot that was more than 15 years old. More than one year later, we saw no regrowth. Glyphosate works best if bermuda is growing well. The better the bermudagrass is growing, the more chemical is taken up and pushed into the roots. Water and fertilize if needed to get it going.

Spray about the middle of this month (or when the bermuda is growing well) and again about a month later if there is any green left in the bermudagrass. Use glyphosate (2% solution). Wait two more weeks and reseed. It may also be helpful to scalp (mow as low as possible and remove clippings) the lawn two weeks after the first application so that dead grass does not prevent the glyphosate from reaching the recovering bermuda. (Ward Upham)

Slime Molds

Picture
Slime molds are primitive organisms that are common on turf and mulch. Slime molds are not fungi and are no longer classified as such. They belong to the Kingdom Protista rather than Kingdom Fungi. On turf, you might often see large numbers of small gray, white or purple fruiting structures, called sporangia on leaf blades during cool and humid weather throughout spring, summer, and fall. Affected areas are often several inches to 1 foot in diameter. During wet weather, the fruiting structures may appear slimy. As the structures dry out in hot weather, they become ash gray and break up easily when touched.

Homeowners often are concerned that this is a disease organism that will kill the grass, but slime mold feeds on bacteria, other fungi, and dead organic matter. It simply uses the turf as a structure on which to grow. However, slime mold can damage turf by completely covering leaf blades and interfering with photosynthesis. Chemical control of slime molds is not necessary. Use a broom or a heavy spray of water to dislodge the mold.

Slime molds on mulch often attract attention because of their bright colors and disgusting appearance. Common names are often quite descriptive. For example, the "dog vomit" slime mold is a bright, whitish color that resembles its namesake. It eventually turns brown and then into a hard, white mass. There is also the "scrambled egg" slime mold, "the yellow blob" slime mold and the "regurgitated cat breakfast" slime mold. Slime molds do not hurt anything, but most people do not find them attractive and want to get rid of them. Simply use a shovel to discard the offensive organism and then stir up the mulch for aeration. (Ward Upham)

Vegetables:
Hornworms on Tomatoes

Picture
Hornworms are the largest larval insect commonly seen in the garden. Though usually seen on tomato, they can also attack eggplant, pepper, and potato. The larval stage of this insect is a 3 ½- to 4-inch long pale green caterpillar with five pair of prolegs and a horn on the last segment. The two most common hornworms are the tobacco hornworm (seven diagonal white stripes and, most commonly, a red horn) and the tomato hornworm (v-shaped markings with a horn that is often blue or black). The adult of the tobacco hornworm is the Carolina sphinx moth.  The five-spotted hawk moth is the adult of the tomato hornworm. Both moths are stout-bodied, grayish-colored insects with a wing spread of 4 to 5 inches.

The larva is the damaging stage and feeds on the leaves and stems of the tomato plant, leaving behind dark green or black droppings. Though initially quite small with a body about the same size as its horn, these insects pass through four or five larval stages to reach full size in about a month. The coloration of this larva causes it to blend in with its surroundings and is often difficult to see despite its large size. It eventually will burrow into the soil to pupate. There are two generations a year. This insect is parasitized by a number of insects. One of the most common is a small braconid wasp. Larva that hatch from wasp eggs laid on the hornworm feed on the inside of the hornworm until the wasp is ready to pupate. The cocoons appear as white projections protruding from the hornworm's body. If such projections are seen, leave the infected hornworms in the garden. The wasps will kill the hornworms when they emerge from the cocoons and will seek out other hornworms to parasitize.

Handpicking is an effective control in small gardens. Bt (Dipel, Thuricide), spinosad  (Conserve; Borer, Bagworm, Leafminer & Tent Caterpillar Spray; Colorado Potato  Beetle Beater Conc; Captain Jack's Dead Bug Brew, Monterey Garden Insect Spray), cyfluthrin (Bayer Vegetable & Garden Insect Spray) and other insecticides may also be used to control hornworms.  (Ward Upham)

Weird Squash, Cucumbers, or Melons

Picture
Occasionally we receive a call from someone who has a squash (or cucumber or melon) that just doesn’t look like what was supposedly planted.

They often wish to know if that fruit had cross-pollinated with another vegetable close by.  In such cases, the gardener is assuming that cross-pollination will affect the fruit.  Such is not the case.  The characteristics of the fruit is determined by the mother plant and is not affected by cross-pollination.  However, there will be a problem if seed is saved for the next year from a flower that was cross-pollinated.  All bets are off on what you will get if that happens.

So how do we end up with this weird fruit?  Though it could be that the gardener had forgotten exactly what he planted, more likely is that the seed he planted had been cross-pollinated before packaging.   Another possibility is that it came from seed that came from fruit that had rotted in the garden the previous year.  Regardless, don’t worry about planting different cultivars of squash or cucumbers or melons close to one another.  Though cross-pollination may occur, the fruit will not be affected.  (Ward Upham)

Raccoons and Sweet Corn

Picture
It seems the official sweet corn inspector should be the raccoon as they seem to harvest the sweet corn the day before it is to be picked. The only effective control measure I have had success with is the electric fence. Here are some suggestions based on my experience. Other designs may very well work but this is what has worked in my garden.

– Two or more wires must be used. Place the first about 5 inches above the ground and the second 4 inches above the first (or 9 inches above ground). Raccoons must not be able to crawl under, go between or go over the wires without being shocked.

– Fence posts used for electric fences work well for this application (go figure), as do the insulators used to support the electric wire.

– It is much easier to use the woven electric wire with strands of wire embedded than to use a solid metal wire. The woven wire is easier to bend around corners and to roll up when done for the year.

– Though both the plug-in and battery operated fencers work, the battery operated types allow more versatility in where corn is grown. One set of batteries is usually sufficient for the season. In my case, I pull the battery out of an old tractor that is not used often. It will also last the season if fully charged at the beginning. My fencer is probably on for a total of a month.

– Start the charger before the corn is close to being ripe. Once raccoons get a taste of the corn, they are more difficult to discourage.

– Control weeds near the wire. Weeds can intercept the voltage if they touch a wire and allow raccoons entry beyond the weed.

– Check the wire occasionally to make sure you have current. This can be done easily (but unpleasantly) by touching the wire. There are also tools that will measure the voltage available for sale. They are worth the money. (Ward Upham)

Fall Gardening: Cole Crops

Picture
Probably the last thing most gardeners are thinking of now is planting vegetables. However, for those hardy few, now is the time to start the cole crops such as cabbage, broccoli, and cauliflower. These members of the cabbage family can be either seeded directly in the garden or started in pots for transplanting about mid-August.

Plant slightly deeper than you would in the spring so the seed stays cooler and the soil around the seed stays moist longer. Plant more thickly and thin later.  The plants may need to be protected from rabbits through the use of fencing.

Use light amounts of fertilizer before planting. For example, apply 1/4 cup of a low-analysis fertilizer (6-7-7) per 10 feet of row. Sidedress two weeks after transplanting or four weeks after sowing seed by applying 2 tablespoons of a 16-0-0 or 1 tablespoon of a 27-3-3, 30-3-4 fertilizer, or something similar per plant.

Watering must occur more frequently because seed should not be allowed to dry out. Overhead watering often causes soil to crust, making it more difficult for young, tender plants to emerge.  Prevent this by applying a light sprinkling of peat moss, vermiculite or compost directly over the row after seeding. Even better, use a soaker hose right next to the row to allow water to slowly seep into the ground.

Plants should be ready for harvest in late September to early October, with broccoli side shoots developing well into November, weather permitting. (Ward Upham)

Fruit:
When to Pick Blackberries

Picture
The exact time to harvest blackberries varies by cultivar, with thorny blackberries normally ripening earlier than thornless types. But there are some general guidelines to keep in mind when harvesting blackberries. Do not pick blackberries too early or berry size and flavor will be sacrificed.          

Two major characteristics determining maturity for harvest are fruit color and ease of separation. Blackberries usually develop a dull, black color with plump, juicy fruitlets as they ripen. The berries soften and produce the characteristic flavor. Full color often develops before the berries separate easily. Pick the berries by gently lifting the berry with the thumb and fingers. The receptacle, or center part of the fruit, remains in the fruit when blackberries are harvested, unlike raspberries, which leave the receptacle on the bush. Take care not to crush the berries or expose them to the hot sun. When possible, avoid picking berries when they are wet. They'll probably need picking every second or third day. Cool the berries immediately after harvest to extend shelf life. Keep them refrigerated under high relative humidity and use within three to five days. (Ward Upham)

Pests:
White-lined Sphinx Caterpillar

Picture
The caterpillar of this species is a hornworm reminiscent of the tomato and tobacco hornworms.  Like other hornworms, this larva has a horn on the tail-end.  However, this is a thinner hornworm and prefers plants such as evening primrose, portulaca, pigweed and purslane.  Beneficial plants such as apple, elm, grapes and some garden vegetables are also fed on at times.   

The caterpillar is highly variable in coloration but are often green with black stripes and yellow and orange markings.  High populations can result in larvae that are very dark to almost black.  Though the horn on the back end of the larva may look dangerous, it is not.  It will neither sting or penetrate the skin.  Sphinx moths received their name from the habit of some of the caterpillar raising its head and striking a sphinx-like pose when at rest.

Control of this insect is rarely called for as it most commonly feeds on weeds.  However, if control is warranted due to feeding on desirable plants, follow the recommendations given in the accompanying article on tomato hornworms.  (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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    Pawpaw Trees
    Peaches
    Pears
    Peas
    Peonies
    Peony
    Peppers
    Perennial Garden Clean Up
    Perennial Garden Clean-up
    Pesticide Effectiveness
    Pine Wilt
    Planting Calendar
    Plastic Mulch
    Plum
    Poinsettia
    Poison Ivy
    Poisonous Plants
    Pokeweed
    Poor Drainage
    Potatoes
    Powdery Mildew
    Powdery Mildew On Lawn
    Power Raking
    Propagating-woody-plants
    Prop Up Fruit Limbs
    Pruning
    Publications
    Quince
    Rabbits
    Raccoons
    Rain-barrels
    Raspberries
    Recommended-plants-for-ks
    Rhubarb
    Roasting Pumpkin Seeds
    Roots
    Rose
    Rose Rosette
    Roundup For Lawns
    Salad Garden
    Sawfly Larvae
    Scale
    Scale Insects
    Screen Trees
    Sedum
    Seed Germination
    Seed Germination
    Seed Tape
    Septoria Leaf Spot
    Shrub Pruning
    Shrubs
    Sidedressing
    Slime Molds
    Slugs
    Smut
    Soil
    Soil Preparation
    Soil Temperature
    Spider Mites
    Spiders
    Spirea Aphid
    Spittlebugs
    Spray Water PH
    Spreaders
    Spring Bulbs
    Spring Flowering Shrubs
    Squash
    Squash Bugs
    Squash Vine Borer
    Squirrel Damage
    Starting Seed
    Stink Bugs
    Storing Power Equipment
    Storm Damage
    Stratification
    Straw-bale-gardening
    Strawberries
    Succession Planting Of Vegetables
    Sunflowers
    Sunscald
    Survey
    Sweet Corn
    Sweet Potatoes
    Tall Fescue
    Tan/White Drupelets
    Termites
    Thatch Control
    Ticks
    Tomatoes
    Transplant Fertilization
    Tree Health
    Tree Leaves And Turf
    Tree Planting
    Trees
    Tubakia
    Tubakia-leaf-spot
    Turf-in-shade
    Twig-girdlers
    Vegetable-flowersfruit
    Vegetables
    Vegetable Seed
    Vegetable Transplants
    Velvet Ants
    Vinegar As Herbicide
    Walnut Caterpillars
    Warm Fall
    Water Damage
    Watering
    Watermelon
    Water Teepees
    Weeds In Flower Beds
    Weeds In Turf
    Weird Squash
    White Grubs
    Whitelined-sphinx-caterpillar
    Wildflower Establishment
    Wildflower-establishment
    Wildlife
    Wild Violet Control
    Wind Chill
    Winter Damage
    Winterizing Water Lines
    Winter Mulching Vegetables
    Winter Squash
    Wood Chips
    Worms From Oaks
    Yellowjackets
    Yellow Nutsedge

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