Efficacy of heat treatment on phosphine resistant and susceptible populations of stored product insects. (March 2019)

• Record Type: Journal Article
• Authors: Agrafioti, P.; Athanassiou, C.G.; Subramanyam, Bh.
• Is Part Of: Journal of stored products research. Volume 81(2019)
• Page Start: 100
• Page End: 106
• Publication Date: 2019-03
• Subjects: Heat treatment -- Stored product insects -- Phosphine resistance -- Non-chemical control; Food -- Storage -- Periodicals; Farm produce -- Storage -- Diseases and injuries -- Periodicals; Entomology -- Periodicals; Food Contamination -- Periodicals; Food Preservation -- Periodicals; Insect Control -- Periodicals; Aliments -- Entreposage -- Périodiques; Produits agricoles -- Entreposage -- Maladies et dommages -- Périodiques; Electronic journals; 631.568
• DOI: 10.1016/j.jspr.2018.11.007
• Languages: English
• ISSNs: 0022-474X

Abstract

Abstract: In this study we evaluated the efficacy of heat treatment on phosphine resistant and susceptible populations of stored product insects at twenty three different commercial facilities in Greece. Heat treatments were carried out by using special equipment, such as Therminate, TempAir and ThermoNox, applied alone or in combination. The overall temperature range was between 33 and 55 °C and the duration of the heat treatments was between 20 and 39 h. Adults of the lesser grain borer, Rhyzopertha dominica (F.) (Coleoptera: Bostrychidae), and the sawtoothed grain beetle, Oryzaephilus surinamensis (L.) (Coleoptera: Silvanidae), were used in the experiments. The field populations were collected from different storage facilities in Greece and were characterized as resistant populations by using the Detia Degesch Phosphine Tolerance Test Kit. Insect mortality was measured at the termination of each trial. Then, the vials were kept in incubator chambers at 25 °C and 65% relative humidity and 65 d later the progeny production was measured in the treated substrate. In light of our findings, in the vast majority of the cases, complete control was observed for both resistant and susceptible populations at all facilities. In general, in the few cases where survival and progeny production was recorded, there was no specific trend towards specific species or population. Overall, based on the current results, heat treatment can be used by the industry as an alternative method for the control of phosphine-resistant adults of R. dominica and O. surinamensis . Highlights: Populations of two stored product insects with different susceptibility to phosphine were exposed to commercial heat treatments. All populations were susceptible to heat treatments, regardless of their susceptibility to phosphine. Heat treatment is effective against phosphine resistant populations of Rhyzopertha dominica and Oryzaephilus surinamensis .