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>Spittle Bugs Turn Grass From Green To Brown

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Tuesday, May 19, 2009
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Author: COBB
PubID: ANR-0170
Title: CONTROLLING TWO-LINED SPITTLEBUGS ON LAWNS Pages: 2 Balance: 105
Status: IN STOCK
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ANR-170, Reprinted May 1998. Patricia Cobb, Extension Entomologist, Professor, Entomology, Auburn University

Controlling Two-Lined Spittlebugs On Lawns


Two-lined spittlebugs are sucking insects that belong to the family Cerocopidae (Figure 1). Adults and nymphs have long been recognized as occasional pests on ornamental plants. However, in the last few years, two-lined spittlebug nymphs have become grass pests on home lawns in the South.


Grass Damage And Hosts

Spittlebugs damage grass by piercing the plant tissue with their needle-like mouthparts and sucking out sap. Spittlebug nymphs surround themselves with a mass of froth (spittle) close to the soil (Figure 2).
Damaged grass becomes wilted, turns yellow, and then browns and dies. These damaged areas may start out as wilted or yellowed patches 2 to 4 inches in diameter. Yellowed areas resemble grass affected by iron chlorosis. In heavily infested turf, these small areas may blend so that the whole lawn appears off-color.
Plants commonly infested by adult spittlebugs include hollies (especially Japanese holly), wild grasses, aster, blackberry, pea, and morning glory. Spittlebug nymphs have been reported as damaging a variety of ornamental plants, coastal bermudagrass, and weedy grasses.
Lawn grasses damaged by spittlebugs include St. Augustinegrass, zoysiagrass, and bermudagrasses. Centipedegrass is also damaged; however, damage seems to be more severe than in other grasses. Damage to lawn grasses usually begins in June and continues through August or early September.


Description And Life Cycle

Two-lined spittlebugs overwinter as eggs in hollow stems, behind leaf sheaths, and in plant debris on the soil. Eggs require high humidity for developing and hatching. Nymphs hatch in May and early June in most of the South.
Newly hatched nymphs move around and begin feeding in humid, sheltered places, usually deep in the turf. Each feeding nymph soon produces a frothy mass of spittle which protects it from drying and from natural enemies.
These wingless nymphs resemble adults in shape but they are smaller and are off-white, orange, or yellow with red eyes. After feeding for about a month and going through four nymphal periods, two-lined spittlebugs become adults.
Adults are most active in early morning. They spend the warmer hours of the day deep in turf or foliage. They live for about a month and females deposit eggs during the last two weeks of this time. There are two or more generations a year and there is usually some overlap between these generations. Eggs laid in midsummer will hatch about two weeks later. Those laid in late summer or early fall go through the winter in this stage.


Spittlebug Damage And Humidity

Humidity is the major factor for the development of two-lined spittlebug populations on turf. Eggs and nymphs require a moist, humid environment for growth and development. Humidity is conserved when eggs are deposited deep in the turf and nymphs develop masses of spittle.
Humid weather conditions in the Southeastern United States during most of the period between May and September, as well as regular turf watering procedures, also provide needed moisture. Under these conditions, thick turf and thatch are a perfect combination for retaining moisture at a level deep within the turf where damaging spittlebug nymphs are located.


Diagnosis And Control

An abundance of adult spittlebugs on ornamentals and lawns may result in an infestation that meets the thatch and moisture requirements necessary for egg and nymph development. However, control of adults has not yet been shown to be effective. Lawns heavily infested with spittlebug nymphs may feel squashy when walked on, as if shaving foam were underneath. This sometimes occurs before yellow spots appear in the grass.
Be sure a proper diagnosis is made before spittlebug control efforts are begun. Examine these areas or wilted spots for nymphs. Remember, spittle masses are usually located deep within the grass or in the thatch. Open the spittle masses to reveal the nymph, feeding head down.
Thatch control is important in preventing and controlling spittlebugs on lawns. Proper dethatching and fertilization practices can disrupt the humid conditions essential for spittlebugs.
When treatment is required, mowing before application may also aid in control. Collect and destroy all clippings. If possible, irrigate turf after mowing. Do this several hours before making an insecticide application. Treat late in the day. Once treatment is done, delay mowing for several days.
Control spittlebug infestations chemically with diazinon 25EC or acephate (Orthene Turf, Tree and Ornamental Spray), 8 fluid ounces per 1,000 square feet; or chlorpyrifos (in less thatchy lawns) 22.4EC, 1.5 fluid ounces per 1,000 square feet. Water as required by label directions. Never apply pesticides for the treatment of plants or sites not listed on the label. Apply sprays in 6 to 10 gallons of water per 1,000 square feet, depending on the thickness of the turf. Reinfestation from surrounding lawns or other areas may occur.


Trade names are used only to give specific information. The Alabama Cooperative Extension System does not endorse or guarantee any product and does not recommend one product instead of another that might be similar.


For more information, call your county Extension office. Look in your telephone directory under your county’s name to find the number.


For more information, contact your county Extension office. Visit http://www.aces.edu/counties or look in your telephone directory under your county’s name to find contact information.


Issued in furtherance of Cooperative Extension work in agriculture and home economics, Acts of May 8 and June 30, 1914, and other related acts, in cooperation with the U.S. Department of Agriculture. The Alabama Cooperative Extension System (Alabama A&M University and Auburn University) offers educational programs, materials, and equal opportunity employment to all people without regard to race, color, national origin, religion, sex, age, veteran status, or disability.

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>Keep Your Lawn Green

>

Chinch bugs, overwatering can ruin a lawn

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   Close-ups of chinch bugs, which may be cause of brown spots.
Close-ups of chinch bugs, which may be cause of brown spots.

aghu@ifas.ufl.edu

Q: My yard is sodded with old St. Augustine grass and every year during the cool months it develops some brown patches. How can I remedy this situation?

D.W., via e-mail

A: First, check your irrigation system. The brown spots may be due to poor water distribution. Normally, we don’t see turf-grass disease problems in the winter unless the lawn is overwatered or watered in the evening before 2 a.m.

You can look for chinch bugs. Remove the top and bottom of a used coffee or soup can. Push the can into the grass where the lawn is yellowing but not dead. Fill with water plus a few drops of liquid soap. If your lawn is declining due to chinch bugs, you’ll see small black and white insects floating. You’ll need to repeat this in several areas in your lawn.

Go to University of Florida websites such as http://edis.ifas.ufl.edu or ”solutions for your life” to find information on lawn care and how to treat for garden problems.

If you suspect the lawn is diseased, you’ll need to take a sample to the UF Plant Diagnostic Clinic in Homestead for the pathologist to look for causal organism. There is a fee and specific instructions about how to take a sample, so please visit their website, http://trec.ifas.ufl.edu/clinic/index.shtml

Adrian Hunsberger is an entomologist/horticulturist with the UF/IFAS Miami-Dade Extension office. Write to Plant Clinic, 18710 SW 288th St., Homestead, FL 33030; e-mail aghu@ifas

.ufl.edu

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