DeFrancesco, J.

Fisher, Glenn C.

Horton, R.

Undetermined

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DEVELOPING PEST MANAGEMENT STRATEGIES FOR ROOT WEEVILSG. FisherJ. DeFrancescoR. HortonExtension EntomologyDepartment of Entomology, Oregon State UniversityCorvallis, Oregon 97331 541/ 737-3151Fisherg@bcc.orst.eduResults of various field trials conducted from 1993 through 1995 tocontrol black vine weevil (BVW), strawberry root weevil (SRW),rough strawberry root weevil (RSRW) and obscure root weevil (ORW)in small fruit crops are reviewed. Cultural (cultivation,flooding), applied biological (nematodes, fungi) and chemical(OP's, SP's botanically derived and sodium aluminofluorideformulated as a bait) controls provided varying degrees of adult orlarval suppression.Delays in new product pesticide registration, re-registration ofexisting products, induced spider mite problems and exactingrequirements for application have greatly compromised control ofweevils with insecticides.Marginal and/or erratic results with azadirachtin and insectparasitic nematodes have been experienced both in research trialsas well as commercial use. Poor to no control with parasitic fungihas been our experience in field plots with 2 strains undergoingcommercial development.Cranberry producers currently have available flooding (for larvalcontrol), insect parasitic nematodes (for larval, pupal control) aswell as Orthene and an apple fiber/cryolite bait for adult control.This crop represents an excellent example of how a growers'cooperative has greatly expedited the use of pest managementtechniques by growers. Liberal funding of their own as well asuniversity research, close working relationship with the EPAthrough the Cranberry Institute and implementing techniques withthe help of a salaried pest management professional has helped thesouthwestern cranberry growers minimize BVW problems.Biological attributes (reproductive potential, broad host range,longevity) behavioral characteristics (nocturnal activity, abilityto overwinter and oviposit early in the season) ecological factors(vertical distribution of larvae in soil, creation of soil cells tooverwinter/pupate, few predators) and difficulties inreliably/efficiently detecting and monitoring populationscontribute to their "key pest status".61

Developing Pest Management Strategies for Root Weevils

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Developing Pest Management Strategies for Root Weevils

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