Journal
JOURNAL OF STORED PRODUCTS RESEARCH
Volume 101, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jspr.2022.102064
Keywords
Prostephanus truncatus; Rhyzopertha dominica; Trogoderma granarium; Adult; Larva; Pyrethroid insecticide
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This study examined the efficacy of etofenprox insecticide on concrete surfaces for controlling Prostephanus truncatus, Rhyzopertha dominica, and Trogoderma granarium adults and larvae over a period of six weeks. The results showed that etofenprox had varying levels of immediate and delayed mortality, with the efficacy dependent on the pest species/developmental stages and the time since application. The highest mortality rates were observed for T. granarium adults in the first week, while mortalities decreased over time for all tested species/stages.
This study addresses the residual efficacy of the pyrethroid insecticide etofenprox sprayed on concrete surfaces for the management of Prostephanus truncatus (Horn) (Coleoptera: Bostrychidae) adults, Rhyzopertha dominica (F.) (Coleoptera: Bostrychidae) adults, and Trogoderma granarium Everts (Coleoptera: Dermestidae) adults and larvae, through a period of six weeks. Three doses of etofenprox (5 mu g/cm(2), 15 mu g/cm(2), and 45 mu g/cm(2)) were tested to assess immediate (1, 2, 3, and 7 days of exposure) and delayed (7 days post-exposure) mortality. For P. truncatus, after 7 days of exposure, immediate mortality ranged between 35.6% and 53.3% the first week while the sixth week ranged from 12.2% to 27.8% after a gradual decrease the weeks in-between. Similarly, at the same exposure interval, the tested doses of etofenprox killed 36.7-62.2% of R. dominica the first week while 20.0-41.1% the sixth week. Etofenprox provided the highest mortality rates against T. granarium adults reaching 93.3-97.8% the first week. After a progressive decrease, mortalities ranged from 73.3% to 87.8% the sixth week. Regarding T. granarium larvae, 43.3-63.3% of the exposed individuals died the first week but during the last week mortalities decreased to 13.3-32.2%. Delayed mortality of all tested species/developmental stages was elevated the first week, reaching 100.0% for all tested doses against P. truncatus and T. granarium adults. During the last week, 45 mu g/cm(2) killed 100.0% of P. truncatus adults, 67.4% of R. dominica adults, and 42.9% and 31.1% of T. granarium adults and larvae respectively. The results indicate that the efficacy of etofenprox on concrete depends on the pest species/developmental stages that are exposed and/or the time that has passed since the application date.
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