Evaluation of Entomopathogenic Fungi Against the Western Flower Thrips (Thysanoptera: Thripidae) Under Laboratory Conditions

Abstract

Abstract Western flower thrips, Frankliniella occidentalis (Pergande), is an economically important pest of greenhouse production systems, and entomopathogenic fungi may be used to suppress populations of the western flower thrips. The objectives of our study were (a) to evaluate the efficacy of products containing three different entomopathogenic fungi (Beauveria bassiana [BotaniGard®], Isaria fumosoroseus [NoFly™], and Metarhizium anisopliae [Met52®]) against western flower thrips larvae and adults and (b) to assess effectiveness of combinations of entomopathogenic fungi and the insect growth regulator azadirachtin against western flower thrips larvae. In two laboratory bioassays western flower thrips larvae and adults were exposed to the three entomopathogenic fungi at two label rates (maximum and minimum), and two product shelf-life conditions (unexpired and expired). Bioassay 1 involved a 120-h incubation period; bioassay 2 entailed a 216-h incubation period. A third bioassay evaluated any synergist...