Exposure to Ecdysone Agonist-Treated Surfaces (Uncompressed) decompressor are needed to see this picture. QuickTime™ and a TIFF ... • Virgin adults (Virgin adults ( 48

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    Entomology Program AreaDivision of Plant Sciences

    University of MissouriColumbia, Missouri 65211 USA

    BarrettB@missouri.edu

    Bruce A. Barrett, PhD

    bybybybybybybyby

    Exposure to Ecdysone Agonist-Treated

    Surfaces Negatively Affects

    Reproduction and Orientation in Adult

    Moths

    Review

    Prothoracic Prothoracic Prothoracic Prothoracic glandsglandsglandsglands Corpus Corpus Corpus Corpus allataallataallataallata

    ecdysoneecdysoneecdysoneecdysone juvenile hormone (JH)juvenile hormone (JH)juvenile hormone (JH)juvenile hormone (JH)

    Insect Endocrine SystemInsect Endocrine SystemInsect Endocrine SystemInsect Endocrine System

    Types of MoltTypes of MoltTypes of MoltTypes of Molt

    Larva Larva Larva Larva ---- LarvaLarvaLarvaLarva Larva Larva Larva Larva ---- PupaPupaPupaPupa Pupa Pupa Pupa Pupa ---- AdultAdultAdultAdult

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    EcdysteroidsEcdysteroidsEcdysteroidsEcdysteroids

    (e.g., ecdysone)(e.g., ecdysone)(e.g., ecdysone)(e.g., ecdysone)

    - stimulate vitellogenesisstimulate vitellogenesisstimulate vitellogenesisstimulate vitellogenesis

    - stimulate spermatogenesisstimulate spermatogenesisstimulate spermatogenesisstimulate spermatogenesis

    - initiates apolysisinitiates apolysisinitiates apolysisinitiates apolysis

    - cuticle productioncuticle productioncuticle productioncuticle production

    MoltingMoltingMoltingMoltingReproductionReproductionReproductionReproduction GrowthGrowthGrowthGrowth

    ---- initiate evagination initiate evagination initiate evagination initiate evagination

    of imaginal discsof imaginal discsof imaginal discsof imaginal discs

    division of epidermal cellsdivision of epidermal cellsdivision of epidermal cellsdivision of epidermal cells

    Review

    Ecdysteroid agonist insecticidesEcdysteroid agonist insecticidesEcdysteroid agonist insecticidesEcdysteroid agonist insecticidesEcdysteroid agonist insecticidesEcdysteroid agonist insecticidesEcdysteroid agonist insecticidesEcdysteroid agonist insecticides

    Tebufenozid

    e (RH(RH(RH(RH----5992)5992)5992)5992)

    Tebufenozid

    e (RH(RH(RH(RH----5992)5992)5992)5992)Methoxyfenozide

    (RH(RH(RH(RH----2485)2485)2485)2485)

    Methoxyfenozide(RH(RH(RH(RH----2485)2485)2485)2485)

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    Mouthparts are trapped within old head capsule and cannot be sheMouthparts are trapped within old head capsule and cannot be sheMouthparts are trapped within old head capsule and cannot be sheMouthparts are trapped within old head capsule and cannot be shed,d,d,d, larvalarvalarvalarva starves to death.starves to death.starves to death.starves to death.

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    Review

    Mimic ecdysone and accelerates the molting process resulting in Mimic ecdysone and accelerates the molting process resulting in Mimic ecdysone and accelerates the molting process resulting in Mimic ecdysone and accelerates the molting process resulting in a premature, lethal molt.a premature, lethal molt.a premature, lethal molt.a premature, lethal molt.

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    From the

    literature . . .Low doses or exposure to insecticides may result Low doses or exposure to insecticides may result Low doses or exposure to insecticides may result Low doses or exposure to insecticides may result

    in nonin nonin nonin non----lethal effects on the target organism. lethal effects on the target organism. lethal effects on the target organism. lethal effects on the target organism.

    Spruce budworm (Spruce budworm (Spruce budworm (Spruce budworm (Choristoneura fumiferanaChoristoneura fumiferanaChoristoneura fumiferanaChoristoneura fumiferana) ) ) ) larvae fed sublethal doses of larvae fed sublethal doses of larvae fed sublethal doses of larvae fed sublethal doses of fenitrothionfenitrothionfenitrothionfenitrothion (OP) . . .(OP) . . .(OP) . . .(OP) . . .

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    resulted inresulted inresulted inresulted in reduced fecundityreduced fecundityreduced fecundityreduced fecundity in adults in adults in adults in adults

    (Alford & Holmes 1986).(Alford & Holmes 1986).(Alford & Holmes 1986).(Alford & Holmes 1986).

    ExamplesExamplesExamplesExamples::::

    Tufted apple bud moth (Tufted apple bud moth (Tufted apple bud moth (Tufted apple bud moth (Platynota idaeusalisPlatynota idaeusalisPlatynota idaeusalisPlatynota idaeusalis) larvae ) larvae ) larvae ) larvae fed sublethal doses of fed sublethal doses of fed sublethal doses of fed sublethal doses of fenoxycarbfenoxycarbfenoxycarbfenoxycarb (JH mimic) . . .(JH mimic) . . .(JH mimic) . . .(JH mimic) . . .

    From the

    literature . . .

    resulted inresulted inresulted inresulted in reduced fecundity and fertilityreduced fecundity and fertilityreduced fecundity and fertilityreduced fecundity and fertility

    in adults (in adults (in adults (in adults (Biddinger Biddinger Biddinger Biddinger & Hull 1999).& Hull 1999).& Hull 1999).& Hull 1999).

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    ExamplesExamplesExamplesExamples::::

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    Low doses or exposure to insecticides may result Low doses or exposure to insecticides may result Low doses or exposure to insecticides may result Low doses or exposure to insecticides may result

    in nonin nonin nonin non----lethal effects on the target organism. lethal effects on the target organism. lethal effects on the target organism. lethal effects on the target organism.

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    Adult diamondback moths (Adult diamondback moths (Adult diamondback moths (Adult diamondback moths (Plutella xylostellaPlutella xylostellaPlutella xylostellaPlutella xylostella) sprayed ) sprayed ) sprayed ) sprayed with with with with sublethal sublethal sublethal sublethal does of does of does of does of carbarylcarbarylcarbarylcarbaryl ((((carbamatecarbamatecarbamatecarbamate) had a ) had a ) had a ) had a

    decrease in fecunditydecrease in fecunditydecrease in fecunditydecrease in fecundity (Kumar & Chapman 1984).(Kumar & Chapman 1984).(Kumar & Chapman 1984).(Kumar & Chapman 1984).

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    ExamplesExamplesExamplesExamples::::

    From the

    literature . . .

    Adult female bollworm (Adult female bollworm (Adult female bollworm (Adult female bollworm (Helicoverpa zeaHelicoverpa zeaHelicoverpa zeaHelicoverpa zea) treated with ) treated with ) treated with ) treated with sublethal doses of sublethal doses of sublethal doses of sublethal doses of permethrinpermethrinpermethrinpermethrin (synthetic (synthetic (synthetic (synthetic pyrethroidpyrethroidpyrethroidpyrethroid) ) ) )

    attracted fewer malesattracted fewer malesattracted fewer malesattracted fewer males than untreated females . . .than untreated females . . .than untreated females . . .than untreated females . . .

    . . . treated males were . . . treated males were . . . treated males were . . . treated males were less likely to respondless likely to respondless likely to respondless likely to respond to to to to

    pheromone traps than untreated males (Moore 1988).pheromone traps than untreated males (Moore 1988).pheromone traps than untreated males (Moore 1988).pheromone traps than untreated males (Moore 1988).

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    Low doses or exposure to insecticides may result Low doses or exposure to insecticides may result Low doses or exposure to insecticides may result Low doses or exposure to insecticides may result

    in nonin nonin nonin non----lethal effects on the target organism. lethal effects on the target organism. lethal effects on the target organism. lethal effects on the target organism.

    ExamplesExamplesExamplesExamples::::

    Adult California Adult California Adult California Adult California fivefivefivefive----spined ips spined ips spined ips spined ips beetle treated with beetle treated with beetle treated with beetle treated with fenoxycarbfenoxycarbfenoxycarbfenoxycarb

    (JH mimic) had a (JH mimic) had a (JH mimic) had a (JH mimic) had a reduction in fertility reduction in fertility reduction in fertility reduction in fertility (Chen & Borden 1989).(Chen & Borden 1989).(Chen & Borden 1989).(Chen & Borden 1989).

    From the

    literature . . .

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    Eastern five-spined ips beetle (Ips grandicollis)

    Low doses or exposure to insecticides may result Low doses or exposure to insecticides may result Low doses or exposure to insecticides may result Low doses or exposure to insecticides may result

    in nonin nonin nonin non----lethal effects on the target organism. lethal effects on the target organism. lethal effects on the target organism. lethal effects on the target organism.

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