Effects of neonicotinoid seed treatments on the non-target lady beetle Coleomegilla maculata: transmission through extra floral nectar

Abstract:

Neonicotinoid insecticides have become popular tools for controlling numerous insect pests in croplands.  Their extensive use has farmers and researchers concerned with potential negative effects posed to non-targeted beneficial insects.  One possible way for beneficial insects to be subject to such insecticides is through consuming extra-floral nectar produced by a treated plant.  This study examined how the use of Neonicotinoid seed treatments affects populations of both beneficial and pest arthropods in sunflower (Helianthus annuus) fields of eastern South Dakota.  Results suggest that extra- floral nectar is a possible way for neonicotinoid insecticides to reach non-targeted beneficial insects.  The use of neonicotinoid seed treatments as a means of pest suppression is very common in agricultural systems growing H. annuus.  Both beneficial predators and pollinators are coming into contact with the insecticide, posing a real threat to many species which attempt to keep the agroecosystem balanced.