The insecticidal efficacy of the inert dust Protector® was evaluated against specimen of mixed ages of the lesser grain borer, Rhyzopertha dominica (Fabricius 1792) (Bostrichidae) and the red flour beetle, Tribolium castaneum (Herbst 1797) (Tenebrionidae). The experiment were performed exposing adults of both species to cereals treated with Protector®, at the dose of 0.5 g/kg, for three exposure intervals (2, 7 and 14 days) and at four temperatures (24, 27, 30 and 33 °C). The adult mortality was measured just after the exposure to the DE (initial mortality); the adults that survived were then held on untreated grains for a week and the mortality was measured again (1-week mortality). The adult mortality did not increase for all temperatures and exposure intervals; at the temperature of 33 °C for R. dominica and at 30 °C for T. castaneum the initial mortality was greater after 7 days in comparison with 14 days of exposure to DE. However, R. dominica adults were the most sensitive to Protector®. Moreover the 1-week mortality for R. dominica adults at 24 and 27 °C decreased with the increase of the exposure intervals. These trials showed that the use of Protector®, against the two coleopteran species, did not allow to obtain the 100% mortality in grouping of mixed age adults.

Insecticidal activity of a diatomaceous earth formulation against a mixed age population of adults of Rhyzopertha dominica and Tribolium castaneum as a function of different temperature and exposure time

BALDASSARI, NADIA;PRIOLI, CHIARA;MARTINI, ANTONIO;TROTTA, VINCENZO;BARONIO, PIERO
2008

Abstract

The insecticidal efficacy of the inert dust Protector® was evaluated against specimen of mixed ages of the lesser grain borer, Rhyzopertha dominica (Fabricius 1792) (Bostrichidae) and the red flour beetle, Tribolium castaneum (Herbst 1797) (Tenebrionidae). The experiment were performed exposing adults of both species to cereals treated with Protector®, at the dose of 0.5 g/kg, for three exposure intervals (2, 7 and 14 days) and at four temperatures (24, 27, 30 and 33 °C). The adult mortality was measured just after the exposure to the DE (initial mortality); the adults that survived were then held on untreated grains for a week and the mortality was measured again (1-week mortality). The adult mortality did not increase for all temperatures and exposure intervals; at the temperature of 33 °C for R. dominica and at 30 °C for T. castaneum the initial mortality was greater after 7 days in comparison with 14 days of exposure to DE. However, R. dominica adults were the most sensitive to Protector®. Moreover the 1-week mortality for R. dominica adults at 24 and 27 °C decreased with the increase of the exposure intervals. These trials showed that the use of Protector®, against the two coleopteran species, did not allow to obtain the 100% mortality in grouping of mixed age adults.
Baldassari N.; Prioli C.; Martini A.; Trotta V.; Baronio P.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/66395
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