Effects of Cold Plasma on Mortality of Adult of Rice Weevil (Sitophilus oryzae)
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Abstract
The objective was to study the effects of cold plasma on mortality of adult of S. oryzae. The treatments were arranged in a factorial in completely randomized design (CRD) with 2 factors as distance between the nozzle of discharge plasma and the insects, and exposure time. For each treatment, 30 adult insects were used and 3 replicas were performed. The mortality rates were collected after exposure to the plasma. The results showed that cold plasma affected this insect in the adult stage by way of the existence of mortality in experimental groups which showed significantly higher rates (P < 0.05) when compared with control group. After the treatment of the cold plasma directly to the insects with rice grains at a distance of 4 cm for 30, 60, 90 and 120 second and at 8 cm distance for 120 second, the results showed the highest mortality rate with 100%. Whereas, after the treatment of cold plasma directly to insects with rice grains at a distance of 4 cm for 30, 60, 90 and 120 second, the mortality found 10.00±3.33, 8.89±1.92, 11.11±1.92 and 17.78±5.09%. At a distance of 8 cm, the mortality was found at 1.11±1.92, 5.86±1.92 and 6.67±0.00% after exposed to cold plasma for 60, 90 and 120 second, respectively. Moreover, the results indicated that the mortality rates increased when exposed to longer time. However, mortality rates decreased when the distance between the nozzle of discharge plasma and the insects was no longer. Regarding the comparison of argon/helium-generated cold plasma, the higher mortality rate after the exposure to the plasma was observed in helium plasma than argon plasma.
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King Mongkut's Agricultural Journal
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