Crop Protector KS

Copenhagen, Denmark

Crop Protector KS

Copenhagen, Denmark

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Hansen L.S.,University of Aarhus | Hansen P.,Crop Protector KS | Jensen K.-M.V.,University of Aarhus
Pest Management Science | Year: 2012

BACKGROUND: Gaseous ozone (O 3) has potential for control of insects in stored grain. Previous studies have focused on freely exposed insects. Immatures of internal pests (e.g. Sitophilus spp. and most stages of Rhyzopertha dominica F.) are protected within kernels and probably require higher doses and/or longer treatment times for full control. A laboratory study determined the doses of ozone necessary for full control of freely exposed and internal stages of eleven stored-product pest species. Test insects were three species of Sitophilus, R. dominica, Tribolium confusum Jacquelin du Val, T. castaneum Herbst, Plodia interpunctella Hübner, Sitotroga cerealella Olivier, Oryzaephilus surinamensis L., Ephestia kuehniella Zeller and Stegobium paniceum L. Insects were exposed to continuous flows of ozone in doses of 10-135 ppm and exposure times of 5-8 days. Dose-mortality bioassays were conducted on three species of Sitophilus and P. interpunctella. RESULTS: Freely exposed stages (with a few exceptions) were controlled with 35 ppm of ozone for 6 days. Full mortality of internal stages within kernels required exposure to 135 ppm for 8 days. CONCLUSION: This study confirms that higher doses and/or longer treatment times are necessary for control of internal stages of stored-product pests. © 2012 Society of Chemical Industry.


Hansen L.S.,University of Aarhus | Hansen P.,Crop Protector KS | Vagn Jensen K.-M.,University of Aarhus
Journal of Stored Products Research | Year: 2013

Gaseous ozone (O3) has shown potential for control of insects in stored grain. A previous laboratory study determined doses of ozone necessary to control freely exposed and internal stages of eleven stored product pest species at 20°C. In this study the impact of temperature on the effect of ozone was tested on two species of stored product pests: Sitophilus granarius and Plodia interpunctella. Insects were exposed to continuous flows of ozone in doses of approximately 33ppm for 6d or approximately 131ppm for 8d at low temperatures between 7.3 and 7.9°C and high temperatures between 29.6 and 31.6°C, respectively. Results from the previous study conducted at 20°C were used in the data analysis.The result of the treatments was unaffected by the temperatures used in the study. Treatment with a high dose of ozone for 8d led to full mortality in all stages of S.granarius and all stages of P.interpunctella except eggs at the high temperature. At the low dose for 6d some survival was found in both species at all three temperatures. Thus, in the temperature range studied, we could not confirm that the effect of ozone on S.granarius and P.interpunctella is related to temperature. © 2013 Elsevier Ltd.

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