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Pesticidal Evaluation of Manilkara zapota (L.) against Tribolium castaneum (Herbst)

Keywords: Manilkara zapota , Tribolium castaneum , Ethyl acetate extract , Stem bark

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Abstract:

This paper presents the residual eff ects of Manilkara zapota (L.) P. Royen plant against the red flour beetle, Tribolium castaneum (Herbst). Four doses, i.e., 1238.5, 619.25, 309.6 and 154.8 μg/cm2 of ethyl acetate extract of stem bark of Manilkara zapota were applied on larvae and adult beetles. The effectiveness of the plant extract was increased with the increase of exposure time and after 72 hrs of exposure, the maximum residual toxicity was observed with LD50 of 228.8, 281.1, 413.4, 423.7, 455.2, 498.7 and 526.5 μg/cm2 for first, second, third, fourth, fifth, sixth instar larvae and adults, respectively. The results of this study also demonstrated that the earlier instars were more sensitive to the extracts than those of late instars as well as adults.

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