Evaluation of Diatomaceous Earth and Kaolin Clay as Repellents on Periodical Cicada (Magicicada spp.) Adults (Brood X) in Screen Cages

Abstract

During emergence years, egg-laying by periodical cicada adults (Magicicada spp.) (Hemiptera: Cicadidae) poses a serious threat to deciduous trees like Acer, Cercis, Malus, Quercus, and others) in open-field nurseries in eastern United States. Garden Safe® diatomaceous earth (DE) and Surround® WP kaolin clay (KC) were tested for repellence against adult cicada egg-laying in screen cage “choice” experiments using two plant varieties (Malus spp. and Cercis spp.). This study confirms the potential of these two biorational insecticides to reduce egg-laying damage, and to further aid nursery managers in developing their pest management programs.