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Effect of Azadirachta indica and Citrus sinensis on Sitophilus zeamais (L.) (Coleoptera: Curculionidae) insect of stored maize grains.

Archana Kumari*
University Department of Botany, Jai Prakash University, Chapra, Bihar, India
Received : 08th January, 2023 ; Revised : 10th February, 2023

Abstract– Powders of Neem (Azadirachta indica) leaf and Orange (C. sinensis) peels were tested for their insecticidal actions against adult Sitophilus zeamais, (Coleoptera: Curculionidae) under controlled conditions at 75+5 percent relative humidity and 27+2oC temperature during the Winter season. Experiments consisted of exposing adult S. zeamais to both the Neem leaf and orange peels powders. The maize seeds were treated with Neem leaf powder and Citrus peel powder in different dosage from 10g, 20g and 30gm during the study period. These biopesticides were thoroughly mixed with required quantity of seeds and kept in 1 kg capacity glass jars by manual operation. The result indicated that pulverized plant powder had no significant reproductive effect on adult S. zeamais. The maximum number of eggs was found in Neem powder (22.34%) rather than Citrus peel powder in different dosages in this study. The incubation period did not differ significantly among various plant protectant treatments. The maximum incubation period was in Neem leaf powder (12.6 days) while it was minimum in citrus peel powder. The hatchability percentage of the pest was minimum (27.24 %) in the grains treated with Neem powder and this treatment was followed by Citrus peel powder in different concentrations in this research.

Key words: Neem Leaf, Orange Peel, S. zeamais, Maize grains

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