Captan: A Promising Fungicide for Management of Chalkbrood Diseases in the Alfalfa Leafcutting Bee

Abstract
Data on the relationship of different doses of Captan, when incorporated into provision, and incidence of chalkbrood and egg mortality of Megachile rotundata (F.) were presented. A dose of about 0.06 g of Captan/g of provision experimentally laden with spores of either Ascosphaera aggregata Skou or A. proliperda Skou, reduced the incidence of chalkbrood disease caused by either fungus from 60 to <10% in the bee larvae tested. Doses of double value or higher were lethal to the first instars.