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    GardenBugs

    Insect Pest Managementin the Home Vegetable Garden

    Alabama A&M andAuburn Universities

    ANR-1045

    Q.How can I keep bad bugs out of my garden?

    Q.How can I attract good bugs to my garden?

    Q.How can I control slugs and other soil insect pests?

    Q.What insect pests are common to Alabama?

    Q.How can I control insect pests without insecticides?

    www.aces.edu

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    The best way to manage insect pests inthe home vegetable garden is to usea combination of strategies, includingcultural, mechanical, and biologicalcontrols. Organic gardeners rely totally on

    nonchemical methods. Most home gardeners cantolerate some insect damage on their vegetables;consequently, they are able to use manynonchemical control strategies that can reduce,but not always eliminate, insect damage. Homegardeners not opposed to using chemicals may usechemical controls when nonchemical methods donot provide sufficient levels of control.

    Modern pest management relies on planningbefore planting rather than responding to apest problem after it has occurred. For example,

    you can prevent many insect pest problems byusing what you know about the pest to make the

    vegetable planting less suitable for pest devel-opment. This could mean planting early to avoidhigh pest numbers that occur late in the season.

    Correct identification of insect pests infesting

    the vegetable garden is critical so you can developa management plan. Equally important is recog-nition of beneficial insects. Your county Extensionagent can help you identify pests and developmanagement strategies for specific pest andcrop situations.

    This publication provides:

    Tips on making your garden vegetables lesssusceptible to insect damage.

    General recommendations for managingsoil pests.

    General recommendations for managing

    above-ground pests.

    Making Your GardenVegetables Less Susceptibleto Insect Damage

    In home vegetable gardens, insecticides shouldbe used only as a last resort to prevent seriousinsect damage. Insecticides kill beneficial insects as

    well as harmful insects. You may not even noticethat these good insects are present, but if they are

    destroyed, pest insect populations can increase tovery high numbers.

    You can reduce or eliminate the need forinsecticides in your garden by using a varietyof techniques. The best approach to successfullycontrol garden pests is to use a combinationof techniques.

    Healthy SoilHealthy soil will produce plants better able

    to resist insects and disease. Before planting yourgarden, turn over the soil and add organic matter

    such as manure or compost to supply essentialnutrients. Organic nutrients are released slowly,in contrast to synthetic fertilizers which providequick-fix nutrients.

    Its a good idea to have your garden soil testedto determine if soil nutrients and pH are suitablefor growing vigorous plants. Soil testing can bedone for a nominal fee; contact your countyExtension agent for more information.

    Companion PlantingSome plants contain or give off compounds that

    repel insects. Companion planting is the practiceof strategically placing insect-repelling plantsnext to crops that will benefit from their repellenteffects. For example, planting garlic among

    vegetables helps to deter Japanese beetles, aphids,vegetable weevils, and spider mites; basil plantednear tomatoes repels tomato hornworms; andmarigolds interplanted with squash or cucumberrepel cucumber beetles and nematodes. Checkthe organic gardening section in your library orbookstore for books on companion plants.

    GardenBugsInsect Pest Management in the Home Vegetable Garden

    Alabama A&M andAuburn Universities

    ANR-1045

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    Crop RotationPlanting different kinds of vegetables in a

    different section of your garden each year will helpreduce pest infestation. Some insect pests overwinterin the garden soil and emerge in the spring andbegin searching for food. If the plant they prefer toeat is located several yards away, the insect mustmove to the source. Many will die along the way orfall prey to birds and other insects.

    Also, many vegetables may absorb a particularnutrient from the soil. By rotating your vegetablecrops each year, the soil in a particular sectionof the garden will have the opportunity to restand regenerate. In general, avoid planting cropsin the same plant family in the same location inconsecutive years. For example, potato, eggplant,and tomato are all in the Solanaceae family, sothese crops should be rotated with vegetables inanother plant family, such as the squash or cucurbitfamily, the bean or legume family, etc.

    Diversified PlantingA common practice among home gardeners

    is to plant a single crop in a straight row. Thisencourages pests because it makes it easy for themto travel from one host plant to another. If differentplants are intermingled and not planted in straightrows, an insect is forced to search for a new hostplant thus exposing it to predators. Diversifiedplanting also works well with companion planting.

    Trap PlantsIf given a choice, some insects will opt to feed

    on one plant type over another. For example,pickleworms prefer squash to cucumber, and sometomato worms prefer dill over tomatoes. With alittle knowledge of host preferences, you can takeadvantage of this by placing certain plants wherethey can lure harmful insects away from the plants

    you wish to protect. Once the trap plants havebecome infested, the target insect can be picked offand dropped in soapy water or the entire plant canbe disposed of.

    Barriers and TrapsBarriers and traps can be employed to captureor impede movement of pests. A collar made ofthick paper or cardboard which is placed aroundthe stem of a plant and pressed into the soil aninch or so deep will prevent cutworms and otherburrowing insects from getting into the soil around

    your plants. A board or thick piece of paperpainted yellow and coated with a sticky substance,such as Tanglefoot, will attract and interceptaphids, whiteflies, and other small flying insects.

    MulchMulching is the spreading of organic matter

    in the garden and around plants. It is an effectivemethod to control weeds and also serves as arefuge for predatory insects like ground beetles.Mulch also helps the soil to retain moistureand stay cool, which promotes plant vigor andtolerance to insect attack.

    Add mulch to the garden when plants are 4 to6 inches high. Grass clippings, leaves, hay, sawdust,

    wood chips, and compost make excellent mulches.One drawback of using mulch may be increasednumbers of slugs that may feed on young andsucculent plants.

    CompostFertile soil is the foundation of a healthy

    garden. One of the most effective ways to enhancesoil fertility is to add compost. Compost is madeby mixing organic matter and allowing it to decaythrough a natural process. The end product is adark, rich substance called humus which can beadded directly to the soil.

    The first step in composting is to build aholding bin or composter. Construct the bin fromchicken wire, scrap wood, or cinder blocks. Thedimensions should be at least 3 3 3 feet but can

    vary depending on your needs. Place the bin in aconvenient location. Add leaves, grass clippings,and household vegetable food waste. Do notadd animal residues as they may attract rats andraccoons. Turn the pile to aerate the material. If

    you turn the pile every month, humus will be readyin about 6 months.

    Beneficial InsectsNot all insects are bad bugs. Your garden and

    surroundings contain many insects that are actuallybeneficial because they feed on harmful insects.Therefore, as a gardener, you should be able toidentify garden insects and determine whether theyare harmful or beneficial. Many organic gardeningbooks provide pictures of the most commonbeneficial and pest insects and information on how

    to encourage populations of beneficial insects.Another good reference book with pictures ofbeneficial insects isNatural Enemies of VegetableInsect Pestsby Michael Hoffman and AnneFrodsham. This book may be ordered by phone(607-255-2080) from Cornell University ResourceCenter. Your county Extension agent can also assist

    you with insect identification.

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    Table 1. Attracting Beneficial Insects

    Name of Beneficial Insect Prey Methods to Attract

    Ladybugs Adults and larvae eat aphids, Grow pollen and nectar plants scales, mites, and eggs of like dill, goldenrod, yarrow, some pest insects. cosmos, sweet alyssum. Spray non-crop plants with sugar water. Provide water in a pan filled with gravel during dry periods.

    Hover flies Larvae feed on aphids and Grow pollen and nectar plants small caterpillars. in the Umbelliferae family. Allow some broccoli to flower. Plant tall plants like sunflower so flies can hover.

    Robber flies Adults capture flying insects. Larvae Plant flowering plantslive in soil and feed on soil pests as a nectar source.

    like grubs.

    Ground beetles Feed on snails, slugs, cutworms and Grow pollen-providing plants. Grow other caterpillars, and on potato beetle dense cover crops to provide

    eggs and larvae. shelter. Incorporate grass or stone walkways between garden beds.

    Big-eyed bugs, flower bugs Adults eat aphids, small caterpillars, Grow pollen and nectar plants

    mites, turf pests, thrips, and other like sweet alyssum, alfalfa,small insects. goldenrod, and cosmos.

    Assassin bugs Both nymphs and adults use their Grow perennials to provideneedle-like stylets to suck fluids from permanent shelter plantings.

    and kill aphids and other small insectsand their eggs. Larger wheel bugs attacklarge caterpillars.

    Lacewings (green and brown) Larvae eat aphids, scales, thrips, mites, Plant dill, sunflowers, caraway,and eggs of some pest insects. cosmos, sweet alyssum, and golden-

    rod flowers. Spray sugar water on non-crop plants to attract adults.

    Tachinid flies Larvae are parasites of squash bugs, Grow plants in the Umbelliferaecutworms, Japanese beetles, and many family and other small-flowered

    caterpillars. plants like sweet alyssum and spearmint.

    Wasp parasites Adults inject eggs inside caterpillar Grow pollen and nectar plants in(non-stinging to humans) prey; wasp larvae develop, eventually the Umbelliferae family, also mints

    killing the host. Some species parasitize and herbs. White clover and otherinsect pest eggs. legume cover crops planted adjacent

    to garden beds also attract parasites. Provide shelter with tall plants like sunflowers. Let some broccoli and radishes flower.

    A good way to attract beneficial insects into thegarden is to incorporate plants inside or adjacent

    to the garden that will supply alternative sourcesof food, such as pollen and nectar, and shelterfor beneficial insects. Remember that applicationof synthetic insecticides can destroy the naturalbalance by eliminating beneficial insects. Table 1presents a partial listing of methods to attract someof the more common beneficial insects.

    Managing Soil Pests

    in the GardenGeneral Recommendations

    Many soil insect pest populations reach highnumbers in grass or turf, and home gardens areoften established in areas previously covered withgrass. To reduce soil insect problems, thoroughlytill or spade the area well in advance of planting(30 days or more) and again just before planting.

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    This will bring up soil pests near the surface wheretheir chances of mortality are increased. In mostcases, tilling the soil or sod in fall and early spring

    will sufficiently control soil insects without theneed for a soil insecticide.

    If tilling is not an option, apply a broadcast soilinsecticide 2 weeks before planting to help controlsome soil insects like cutworms, wireworms, and

    white grubs. Check with your local ExtensionSystem office for available insecticides.

    SlugsSlugs like to feed on young seedlings and

    succulent parts of plants. They leave a trail ofmucus on the surfaces on which they crawl. Moist,humid environments favor slug development, andslugs usually overwinter in sheltered locationsoutdoors. They deposit their eggs in moist areasand require a year or more to mature.

    Spade or till garden area in the fall and again

    in the spring before planting Pick slugs by hand. Using a ashlight, check

    the garden around 10:00 p.m. for active slugs. Ifyou find any, pick them up with an old teaspoon.Place captured slugs in a container of salt which

    will kill them. Continue this activity for 3 to 4nights in a row to greatly reduce damage.

    Place stale beer in small cups or pans sunkenin the soil so the lip of the container is slightlybelow ground level. Slugs are attracted to the beer,fall into the container, and drown. For best results,replace the stale beer about every 3 days. Settingout enough containers early in the spring cangreatly reduce slug populations.

    Use diatomaceous earth, lime, or sawdust asa barrier; replace after each rain.

    Pesticide baits are minimally to moderatelyeffective against slugs. To increase their effec-tiveness, apply them late in the afternoon. Bait inthe fall after the first fall rains to target slugs beforethey can lay eggs. Check with your local ExtensionSystem office for available pesticide baits.

    CutwormsCutworms are active only at night and remain

    buried below the soil surface near food plantsduring the day. They emerge to feed at night andoften cut seedlings or small stems, causing theplants to fall over.

    Because grass

    and many weedsare preferred hosts,remove grass and

    weeds in the garden,and plow the soil well in advanceof planting.

    You can also prevent damage byplacing a paper or plastic sleeve over theplant and pressing the bottom into the soil.Place sleeves around newly set transplants ornewly emerged seedlings so that 1 inch is belowground and 3 inches above ground. Paper cups

    with the bottoms removed or 4 inch high sections

    of 12gallon paper milk cartons are ideal. Tuna canswith the bottoms removed may also work.

    Check with your local Extension Systemoffice for available insecticides.

    Use Sevin bait after plant emergence. ApplySevin according to label directions late in theafternoon so the bait will be fresh when the wormscome out to feed at night.

    WirewormsWireworms are the slender, yellowish

    brown, hard-bodied larvae of click

    beetles. They can survive deep in thesoil for up to 5 years and can moveup to attack seed or young plants.Several wireworm species preferplants in the grass family and areusually not a problem unlessthe garden is planted into landthat previously contained grasses orcrops in the grass family.

    Turn over the soil in thefall, and again in the spring wellin advance of planting, to help

    reduce wireworm populations. Use a granular insecticide.Apply granules according to labeldirections, and work then into the soilto a depth of 4 to 6 inches, followedby a good watering.

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    White GrubsWhite grubs are Japanese, May, and June beetle

    larvae that are dirty white in color. The tip of theirabdomen is a blue-black color.They roll into a Cshape whendisturbed. Mature grubs mayreach 2 inches in length.They live in the soil andsometimes feed onplant roots and tubers.

    About the only timethey are troublesomeis when parts ofthe lawn or sod areturned under in thespring for garden use.

    If you mustplant in previ-ously grassy areas,prepare the garden

    well in advanceof planting. As sod isturned over, raked, andprepared for planting,pick up the grubs byhand for the best control.

    Check with your local Extension Systemoffice for available insecticides.

    Mole CricketsMole crickets have brown, velvety bodies with

    broad front legs for digging in the soil. They have

    large eyes and are about1 inch long when mature.As mole crickets tunnelthrough the soil, they candisrupt the root systemof vegetables. They mayalso feed on plant rootand underground stemtissue.

    Avoid planting thegarden in previously grassyareas. If you observe molecricket tunnels around plants,

    tamp the soil back down to restoresupport to the root system.

    Check with your localExtension System office for availableinsecticides.

    Managing Above-GroundPests in the Garden

    Nonchemical methods for managing gardenpests that feed on the foliage and fruit of garden

    vegetables are presented here.

    Aphids To repel aphids, anchor aluminum foil to the

    soil for 1 foot around transplants. Slope soil awayfrom plant so rain water and mud do notobscure reflective surface. You mayremove foil after plants flower.

    Make a water trap bypainting a small, shallow panbright yellow and filling it

    with soapy water. Place severalpans in the garden and refillthem after each rain. Use bright

    yellow-painted (Rust-Oleum

    659 or Safety Yellow) 6- x 8-inchcards or pieces of plywood as stickytraps. Anchor vertically to gardenstakes and spray with Tanglefootor other sticky substance. ReplaceTanglefoot weekly.

    Repel aphids by sprayinga mixture of 2 tablespoons hot red pepper, 2cloves garlic, 1 tablespoon liquid soap (Tide liquidlaundry detergent, for example), and 1 quart of

    water.

    Hand remove and destroy aphid colonies on

    plant leaves. Use a strong spray of water from the hose toknock aphids from plants.

    Spray plants with insecticidal soap orliquid laundry detergent mixed with water (2 to 3tablespoons per gallon). Test tender plants first toensure they are not burned by the soap solution.

    Because aphids can transmit plant virusdisease, remove and destroy diseased plants todelay spread of virus to healthy plants.

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    Asparagus Beetles Plant marigolds near

    asparagus to repel beetles.

    Destroy and bury plantrefuse in the fall to removeoverwintering sites.

    Handpick and destroy

    eggs, larvae, and adults in themorning before they becomeactive.

    Spray asparagus fernswith pyrethrin or rotenone inlate summer so fewer beetles

    will overwinter.

    Cut foliage off at theground as soon as it begins to die back.

    Cabbage Loopers andCabbageworms

    Coverplants withcheeseclothor floatingrow cover toprevent egg-laying.

    Handpick. The greenworms are much easier tospot on red-leaf varieties.

    Spray plants withBacillusthuringiensiswhen worms are still small.

    Remove alternate host weeds, such as wild

    mustard and shepherds purse, from the garden. Interplant a hot pepper plant between every

    two cabbage plants.

    Colorado Potato Beetle Potato beetles prefer to feed on potato,

    eggplant, and tomato. Rotate these preferred hostswith other crops in alternate years.

    Interplant nonhost crops, such as beans, withpreferred host crops.

    Handpick orangeegg masses, reddish brown

    larvae, and yellow-and-black striped adults anddestroy.

    Place straw mulcharound plants as a barrier tobeetle colonization of plantsin the spring.

    Corn Earworm(Tomato Fruitworm)

    With no controlsapplied, earwormsusually damageonly the tip of theear. Cut off the

    damaged tipsand you can eat the rest.

    If possible, avoid planting other vegetablesnear corn, a favorite food of corn earworm.

    Plant and harvest corn as early in the seasonas possible to avoid heavy infestations.

    Drop 14teaspoon of mineral oil on the silksof each corn ear after the silks have wilted butbefore they begin to dry; this helps to repel mothsand egg-laying.

    Select tight-husked corn varieties for planting.Tight husks inhibit worm movement into the ear.

    Beginning at the ower stage, check uppertomato leaves once a week for small, round, whitefruitworm eggs. Spray plants withBacillus thuringi-ensisweekly as long as you detect eggs.

    Cucumber Beetles Plant nonbitter cucumber varieties;

    the bitter compound in cucumberattracts beetles.

    Cover young plantswith cheesecloth orfloating row covers

    until just before bloom. Interplant cucumber

    with radishes; radish seems torepel cucumber beetles. Tansy,marigolds, and nasturtiums alsorepel beetles.

    Eliminate weeds in andaround the garden; some weeds are hosts forbacterial wilt disease that is spread by cucumberbeetles.

    Flea Beetles

    Unless ea beetle populations are heavy,their feeding will not kill plants or reduce

    yields; control is usually unnecessary.

    Flea beetles are most numerousin the spring; plant susceptiblecrops like eggplant and radish laterin the season.

    Weeds bordering the gardenmay serve as alternate hosts;removing weeds will reduce fleabeetle populations.

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    False Chinch BugsFalse chinch bugs are weed-feeding insects that

    may build up in large numbers in arid conditions.They migrate in huge numbers that may overwhelmany control efforts.

    Early-season control of cruciferous weedhosts may help reduce numbers.

    If damage from false chinch bugs reachesunacceptable levels, treatments to field edges willhelp control this pest.

    False chinch bugs are easily drowned. Heavywatering or use of a strong hose spray will drownmany. Trenches or pans of water may be putaround plants during periods of insect migration.

    Leafhoppers Protect plants

    with cheesecloth orother fine mesh rowcovering.

    Hang brightyellow (Rust-Oleum 659

    or Safety Yellow) 6- x8-inch boards covered witha thin coat of Tack Trap orTanglefoot at crop level. Whenthe boards are filled with insects,

    wash them and repeat.

    Spray plants withinsecticidal soap.

    Because leafhoppers can transmitvirus diseases, remove diseased plants todelay spread to healthy plants.

    Mexican Bean Beetles Handpick and destroy egg masses and beetles

    in early morning before they become active.

    Interplantnonhost crops likepotatoes amongbean plants todisrupt egg-laying.

    Usesoybeans as atrap cover. Beanbeetles prefersoybeans plantednearby over snapor lima beans.

    Spider Mites Spray plants with insecticidal soap.

    Keep the foliage wet todeter mites, which dont like moistconditions; however, keeping thefoliage wet can also encourageplant diseases.

    Cover plants withan old blanket to createa cool, moistenvironment thatdeters mites.

    Spray plantswith water or insec-ticidal soap; thencover infested plantsfor 3 days andfollow with a secondsoap spray.

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    Trap grasshoppers by using a 1 quartcontainer half filled with a 10% molasses and

    water mixture.

    Grasshopper populations are most damagingin late summer. Use a floating row cover to protectlate-season plantings.

    Plow the garden in the fall to expose

    grasshopper eggs to the weather and insectpredators. Be sure to plow fence rows andgarden borders too.

    Japanese Beetles Avoid planting garden near

    lawns or in land previouslycontaining lawn.

    Purchase a Japanese beetlepheromone trapto reduce beetle numbers. Locatetrap at least 30 feet away from

    crop plants. Protect plants with

    floating row covers.

    Apply milky sporepowder to surrounding lawn or pasture. Milkyspore powder is generally available on the Internet.

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    Squash Bugs Remove and destroy

    clusters of oval, orange-brown squash bug eggs.

    Remove and destroyvines and unused fruit afterharvest to eliminate overwin-

    tering sites. Place shingles orboards near squash orpumpkin plants in spring orearly summer to attract squashbugs; then collect and destroyadult bugs under the boardseach morning.

    Plant nasturtiums and marigolds near squashplants to deter squash bugs.

    Squash Vine Borers

    Cover plants with nemesh cloth or row cover untilfemale flowers appear. Femaleflowers have a bulge betweenflower and stem that is absentin male flowers.

    Plant squash varieties with long vines.These varieties of squash may continue to growdespite borer damage.

    Plant in late summer or fall to avoid heavyvine borer infestations.

    Cut open borer entry holes in the stem with aknife; then remove the worm and pack moist eartharound the stem.

    Tomato Hornworms Handpick worms from

    plants; check plants in theevening with a flashlight.

    SprayBacillus thuringiensiswhen the worms are still small.

    Plant dill next to tomatoesas a preferred trap crop;hand-pick worms off the dill.

    Do not destroyhornworms with small, whitecocoons attached to their body.These are parasite cocoonsfrom which small, parasitic

    wasps (beneficial)will emerge.

    Turn the soil inthe fall to exposehornworm pupae to

    weather and predators.

    Weevils (Bean Weevil orCowpea Curculio)

    Plant resistant, thick-hulled southern pea

    varieties like AUbe orFreeze-Green.

    Plant beans

    as early aspossible,and turnplantsunder afterharvest.

    Pick shellbeans whensomewhat green;then blanch before freezing; this will kill weevileggs and larvae which are seldom seen in thefrozen beans.

    Before storing, heat beans in a 175F oven foran hour. Cool beans; then bag and freeze them fora week to kill any weevil larvae or eggs. After this,store beans at room temperature.

    Whiteflies Whiteies are rarely a

    problem in outdoor gardens.Make sure purchased trans-plants are not infested with

    whiteflies or other insects.

    Hang bright yellow(Rust-Oleum 659 or Safety

    Yellow) 6- x 8-inch boards,covered with a thin coat ofmineral oil, Tack Trap, orTanglefoot at crop level.

    Spray plantswith insecticidal soap.

    Chemical Control ofGarden Pests

    Check with your local Extension Systemoffice for available insecticides and the proper

    application rates.

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    Charles Ray,Extension Research Fellow, Entomology and Plant Pathology, Auburn University.Originally prepared by Geoff Zehnder, formerExtension Entomologist.

    Use chemicals only according to the directions on the label. Follow all directions, precautions, and restric-tions that are listed.

    Before you apply any pesticide, check with your county Extension agent for the latest information.

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

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

    Published by the Alabama Cooperative Extension System (Alabama A&M University and Auburn University),an equal opportunity educator and employer.

    12M, Reprinted Dec 2011, ANR-1045

    2011 by the Alabama Cooperative Extension System. All rights reserved.ANR-1045

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