SAMPLING POPULATIONS OF THE IMPORTED CRUCIFER WEEVIL,BARIS LEPIDII(COLEOPTERA: CURCULIONIDAE), IN COMMERCIAL HORSERADISH

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Abstract
The imported crucifer weevil,Baris lepidiiGermar, was sampled in commercial horseradish fields by pitfall traps, visual counts, baits, soil cores, and square area removal. Adult counts from soil cores taken directly over the plant crown were closely related to those from 0.25 m2samples centered around the whole plant. Numbers of adults determined by relative sampling techniques such as visual counts, pitfall traps, and baits were not closely related to the number of adults recovered in soil cores. All of the fields examined had adult weevils present at planting time as indicated by bait catches. No sampling method was an adequate predictor of the percentage of horseradish roots infested withB. lepidiiat harvest.