Residual Efficacy of Novaluron Applied on Concrete, Metal, and Wood for the Control of Stored Product Coleopteran Pests
Department of Entomology, University of Agriculture, Faisalabad 38000, Pakistan
Agricultural Research Service Center for Medical, Agricultural and Veterinary Entomology (CMAVE), United States Department of Agriculture, Gainesville, FL 32608, USA
Author to whom correspondence should be addressed.
Received: 19 October 2020
Revised: 19 December 2020
Accepted: 21 December 2020
Published: 25 December 2020
Insect pests of stored commodities cause harm not only to bulk grains but also to many value-added food products in mills, processing plants, and other facilities where these products are stored. In this study, the residual efficacy of an Insect Growth Regulator (IGR), novaluron, was evaluated under laboratory conditions against larvae of three stored product insects, Oryzaephilus surinamensis (L.), Tribolium castaneum (Herbst), and Trogoderma granarium Everts, on concrete, metal, and wood surfaces to which IGRs are typically applied for pest control in such facilities. Statistically significant reductions in emergence percentages of adults compared to a distilled water control occurred for up to 12 weeks when novaluron was sprayed on concrete, metal, and wood at rates between 0.053 and 0.209 mg/m2, the highest of which induces 100% mortality at 0 weeks after treatment. Residual efficacy decreased with increasing time after treatment due to degradation and sorption of novaluron into the surfaces. Novaluron residues were most persistent on metal and least persistent on wood surfaces. Knowledge of novaluron residual efficacy on storage facility surfaces can be helpful guidance for timing of postharvest insect pest management treatments as the costs of commonly used pesticides increase along with insect resistance to such pesticides.