Effects of Low Ozone Concentrations and Short Exposure Times on the Mortality of Immature Stages of the Indian Meal Moth, Plodia Interpunctella (Lepidoptera: Pyralidae)

Abstract

Abstract:In Iran, the Indian meal moth, Plodia interpunctella (Hübner), is one of the most important pests of such stored products as date fruits and pistachio nuts. Ozone was applied as a gas at four concentrations (0, 2, 3, and 5 ppm) for four different periods (30, 60, 90, and 120 min) on the immature stages of P. interpunctella. The results indicated that by increasing the concentration and exposure time, the rate of mortality increased for all tested stages. This study showed that 12-day-old larvae were more susceptible than other stages when exposed to 5 ppm ozone for 120 min. The next in order of susceptibility were pupae, then 5-day-old larvae, and 17-dayold larvae had the highest sensitivity to ozonation. At the highest concentration of ozone, for the longest time, the least mortality rate was recorded for one-day-old eggs. According to the results, a reduction in the population density of P. interpunctella in laboratory experiments is promising. However, validation studies will be necessary to fully determine the potential of ozone as a replacement for the current post harvest chemical control of P. interpunctella on either pistachio nuts or date fruits.

Toxicity of gaseous ozone to the different life stages of cowpea beetle, Callosobruchus maculatus (Coleoptera: Bruchidae), under laboratory conditions

“…Similarly, Isikber and Oztekin (2009) investigated the susceptibility of Tribolium confusum Jacquelin du Val life stages to treatment with ozone at 13.9 mg/l 1 (6,482 ppm) and found that the egg mortality reached 62.5% at 2-h exposure time. Keivanloo et al (2014) stated that treatment with ozone resulted in 56.6% egg mortality of Plodia interpunctella (Hübner) at 5 ppm. In contrary with our results, Bonjour et al (2011) reported that treatment with ozone at a concentration of 70 ppm for 4 days did not cause signifi cant egg mortality of P. interpunctella.…”

Effect of Ozone on A serious Wheat Pest, Sitotroga cerealella (Olivier) and Its Progeny

“…resulted in 91% hatchability and 50% emergence respectively. Keivanloo et al, (2014) showed that not surprisingly, ozone had less effect on egg mortality of P. interpunctella. At the highest ozone concentration× exposure period treatment and the mortality of eggs were (56.66%).…”

Physical Crop Postharvest Storage and Protection Methods

“…It is also used for the disinfection of specific equipment, devices, facilities, for cleaning ventilation and air conditioning. Ozone, as an oxidant, is widely used in water treatment and disinfection-it eliminates unpleasant odors, flavors, and colors [54,[60][61][62].…”

“…Ozonation as a physical method is increasingly used in agriculture, horticulture, and their surroundings [62,66]. It is one of the most promising techniques in plant protection [67,68], it is more effective and acts more rapidly than other solutions used so far.…”