Bioefficacy of Zanthoxylum acanthopodium and its Combination with Plectranthus ternifolius as a Grain Protectant against Rice Weevil, Sitophilus oryzae

Author: Arati Ningombam*, Romila Akoijam, Aruna Beemrote, I.M Singh, Ch. Tania, S.K Sharma, Th. Seilesh Kumar and Leangzin Gangmei

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Abstract

The bioefficacy of Z. acanthopodium was studied as a grain protectant against rice weevil, Sitophilus oryzae, alone and in combination with Plectranthus ternifolius. Rice weevil was found to be the most common and dominating insect pest of stored pulses under NE conditions. The population growth-inhibiting ability of the plant powders by way of suppressing the progeny production was evaluated. Fixed combination ratios of 50:50, 60:40, 70:30 and 80:20 of Zanthoxylum and Plectranthus were studied and evaluated. The GI50 of all the plant powders were calculated, and Z. acanthopodium without any combination was found to have the lowest GI50 of 3.03mg/gm. Among the combinations, Zanthoxylum and Plectranthus in 50:50 ratio gave the best population growth suppressing ability with GI50 of 5.47mg/gm, and 80:20 ratio combination was found the least effective with GI50 of 6.88 mg/gm. Singly or in combination, all the plant powders gave good protection against rice we evil with very low GI50. The

Keywords

Rice weevil, grain protectant, progeny reduction, Zanthoxylum, Plectranthus, ITK, NE India

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