LARVAL FEEDING OF THE WESTERN CORN ROOTWORM (DIABROTICA VIRGIFERA VIRGIFERA LECONTE) ON ROOTS OF SEVERAL WEEDS AND ITS EFFECT ON CROP ROTATION József Takács,

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Presentation transcript:

LARVAL FEEDING OF THE WESTERN CORN ROOTWORM (DIABROTICA VIRGIFERA VIRGIFERA LECONTE) ON ROOTS OF SEVERAL WEEDS AND ITS EFFECT ON CROP ROTATION József Takács, Péter Balogh, Miklós Nádasy and Lénárd Márton University of Veszprém, Georgikon Faculty of Agriculture, Department of Agricultural Entomology, Keszthely, Hungary

Larval feeding of WCR

Questions Is it a monophagous pest? Can larvae feed on roots of other plants? Monocot vs. dicot weeds? Mortality on alternative hosts? Is it a monophagous pest? REALLY???

Is it a monophagous pest?

Dicot weeds

Is it monophagous? Really???

Danger!?! Developing on alternative roots Development of WCR larvae is not possible on alternative host plants. Mortality is so high! BUT!!!

Weeds are suitable for larvae as survival nutriments!

Feeding on alternative hosts

Summarized Survival nutrition on alternative roots Weedy cornfields! HIGHER SURVIVAL RATIO HIGHER DAMAGES!!!

Adult feeding on alternative host plants

Problems in fallow management Weeds on fallow fields Oviposition on weedy plots Larval damages in next year corn

Crop rotation is one of the most effective control method! REALLY???