habitat management for suppression of stink bug pests of …ceyolo.ucdavis.edu/files/53252.pdf ·...
TRANSCRIPT
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Habitat Management for Suppression of Stink Bug Pests of
Tomato in Northern California
By
L. E. EhlerProfessor Emeritus
Department of EntomologyUniversity of CaliforniaDavis, CA 95616 USA
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STINK BUG PESTS OF TOMATO
• Consperse stink bug, Euschistus conspersus Uhler (native).
• Red-shouldered stink bug, Thyanta pallidovirens (Stal) (native).
• Southern green stink bug, Nezara viridula(L.) (introduced).
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CONSPERSE STINK BUG
Most Important
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RED SHOULDERED STINK BUG
Second in Importance
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SOUTHERN GREEN STINK BUG
Sporadic, Late Season
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Adult Egg Mass
Little Stinkers
Life Cycle
Egg (in masses)
Five Nymphal Stages (wingless)
Adult
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DAMAGE TO TOMATO FRUIT
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CONSPERSE STINK BUG
• The major pest of processing tomato in Northern California.
• Requires three habitat patches:-Leaf litter for over-wintering-Spring weeds for first generation-Tomato for second generation
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BLACKBERRY (Rubus spp.) PROVIDES LEAF LITTER FOR OVERWINTERING ADULTS
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BLACKBERRY COMMON IN RIPARIAN HABITATS
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SPRING GENERATION HOST:WILD RADISH (Raphanus sativus)
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SPRING GENERATION HOST: CHEESEWEED (Malva parviflora)
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SRING GENERATION HOST: BLACK MUSTARD (Brassica nigra)
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TOMATO IS HOST FOR SECOND GENERATION
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LEAF LITTER
(Over Winter)
WEEDS(Spring
Generation)
TOMATO(SummerGeneration)
SEASONALITY OF CONSPERSE STINK BUG
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HABITAT MANAGEMENT
• Manage over-wintering habitat.• Disrupt spring generation.
-Control weedy hosts-Use weeds as a trap crop-Replace weeds with native grasses
• Goal: Prevent stink bugs from invading tomato for second generation, where egg parasites and predators are of limited effectiveness.
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MONITOR AND TREAT
• No fixed treatment threshold.• Dynamic treatment threshold.• One stink bug per meter predicted to
cause 5% damaged fruit at harvest.• Treat with insecticide as needed (e.g.,
Methamidophos) to keep damaged fruit at acceptable level.
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What About Stink Bugs and Hedgerows?
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Do Hedgerows Provide Over-WinterSite and Food for Spring Generation?
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RESULTS FOR 2008
• Stink bugs over-winter in hedgerows.• First generation of stink bugs can develop
on certain hedgerow plants.• Egg parasites of stink bugs occur in
hedgerows (low level of mortality).• Do hedgerows suppress or enhance stink
bugs in adjacent tomato crops?
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Toyon: Floral Resources for Pollinators, Seeds and Fruit for Stink Bug Nymphs
Deer Grass: Over-winterSite for Adult Stink Bugs
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SUMMARY
• Consperse stink bugs over-winter in leaf litter, and emerge in mid-March.
• First generation develops on weeds.• Second generation develops on tomato.• Habitat management: Prevent buildup of leaf
litter and manage weeds during the spring.• Goal: Prevent the adult stink bugs from
invading tomato, where biological-control agents are not very effective.