International Journal of Entomology Research

International Journal of Entomology Research


International Journal of Entomology Research
International Journal of Entomology Research
Vol. 6, Issue 2 (2021)

Studies on the individual and combined effect of monocrotophos and neem oil on the digestive enzyme activity of female rice Grasshopper Oxya fuscovittata


P Kalyani, K Muthukumaravel

The present investigation has been carried out to study the 10% sublethal concentration of individual and combined monocrotophos and neem oil on digestive enzyme activities of alimentary canal in the female rice grasshopper, Oxya fuscovittata. In insects exposed to the 10% sublethal concentration of monocrotophos for 96hrs, the levels of amylase were found to be decreased by 52.67% and 55.19% respectively for foregut and hindgut, but in the hindgut, there was an increase in the levels of amylase was 43.90%. In insects exposed to neem oil for 96hrs, the decrease of 31.98% and 34.85% were observed in foregut and midgut respectively, while in hindgut an increase of 12.19% was observed. In insects exposed to 10% sublethal concentration of monocrotophos for 96 hrs, the activity of protease decreased by 61.87% and 65.40% respectively in the foregut and hindgut while the insects showed increased protease activity (69.38%) in hind tissue. In general, the decrease in protease activity was high in monocrotophos treated insects. In insects exposed to sublethal concentration of monocrotophos for 96hrs, the levels of lipase were found to decrease by 84.61% and 75.80% respectively in the foregut and hindgut while the enzyme activity increased by 59.37% in hindgut. The highest gut enzyme activity is seen in the midget of the control insects. Meager amount of enzyme activity was evident in hindgut than in foregut.
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How to cite this article:
P Kalyani, K Muthukumaravel. Studies on the individual and combined effect of monocrotophos and neem oil on the digestive enzyme activity of female rice Grasshopper Oxya fuscovittata. International Journal of Entomology Research, Volume 6, Issue 2, 2021, Pages 61-67
International Journal of Entomology Research