Combined effect of nitrogen mixed with ozone on the mortality of stored‐grain insects

Abstract

A study was conducted to determine the effect of nitrogen mixed with ozone

on controlling stored

â€Âgrain insects in the storehouse. Adults of Sitophilus

oryzae

(L.), Tribolium castaneum (Herbst), Rhyzopertha dominica (F.),

Oryzephilus surinamensis

ºC and 65 ±5% r. h. Experiments were performed at different heights

(10, 20, 40 and 50 cm) and nutrition materials (date, wheat and rice), in

penetration tests and empty

â€Âspace tests. In emptyâ€Âspace trials, the highest

mortality was for

P. interpunctella. In penetration tests, treatment with highpressure

nitrogen and ozone under different height and foodstuff resulted in

different rates of mortality. The mixture of nitrogen and ozone in the interaction

between height and diet (heigh×diet) were not significant for all the

insects, but the mortality was significant at different height for

R. dominica

and

O. surinamensis. The influence of nitrogen and ozone in the date was

more than in rice and wheat. The present findings allow us to suggest that

the mixture of nitrogen and ozone can be used as suitable fumigant to alternate

phosphine and methyl bromide under ambient storage conditions in

penetration and empty

â€Âspace fumigations.

(L.) and 3th larvae of Plodia interpunctella (Hubner)

were exposed the mixture of nitrogen and ozone. After exposure period of

24 h, the insects were transferred to clean jars containing food and held at

27±2