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Seasonal patterns of stored-product insects at a rice mill

Tanja McKay, Amanda L. White, Laura A. Starkus, Frank H. Arthur, James F. Campbell
Journal of economic entomology 2017 v.110 no.3 pp. 1366-1376
Lasioderma serricorne, Plodia interpunctella, Rhyzopertha dominica, Trogoderma variabile, bait traps, buildings, equations, flight, imagos, rice, seasonal variation, storage insects, stored product protection, temperature, winter
The temporal and spatial patterns in flight activity outside of a rice mill were evaluated for the lesser grain borer [Rhyzopertha dominica (F.)], warehouse beetle [Trogoderma variabile (Ballion)], cigarette beetle [Lasioderma serricorne (F.)], and Indianmeal moth [Plodia interpunctella (Hϋbner)] to determine critical times of year when the mill would be vulnerable to invasion. Insect activity was monitored using pheromone-baited glue traps (N = 99) from June 2008 to October 2010. Traps were placed along exterior walls of all major buildings and along the fence around the perimeter of the facility. T. variabile was the most abundant species with flight activity between mid-March and November. No activity of T. variabile was observed during December through March. R. dominica was also abundant with activity in mid-April through October. A few adult R. dominica were captured in traps during winter months in the first year of study. Trap captures for all four species increased with an increase in temperature and can be described by linear and non-linear equations. Knowing seasonal patterns in insect activity allows rice facilities to better understand when facilities are most vulnerable to pest activity. However, this study demonstrates that more research is needed to address how insects are immigrating and emigrating within and around a rice mill.