IJAGST International Journal of Agricultural Sciences and Technology 2710-3366 SvedbergOpen ijagst-1-2-005 10.51483/IJAGST.1.2.2021.40-50 Research Paper Evaluation of toxicity of five medicinal plant extracts on maize weevil, Sitophilus zeamais (Mots.) (Coleoptera: Curculionidae) on stored maize Fatematuzzjohora 1 AhadMd. Abdul 2 * KhatunMost. Rubiya 3 HossainM. A. 4 1MS Student, Department of Entomology. Faculty of Agriculture Hajee Mohammad Danesh Science and Technology University, Dinajpur- 5200, Bangladesh. E-mail: fatem.zohora@gmail.com 2Professor, Dept. of Entomology, Faculty of Agriculture Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh. E-mail: maahadhstu@gmail.com 3MS Student, Department of Fisheries University of Rajshahi, Bangladesh. E-mail: rubiyakhatun259@gmail.com 4Professor, Department of Entomology, Faculty of Agriculture Hajee Mohammad Danesh Science and Technology University, Dinajpur-5 200, Bangladesh. E-mail: alamgirhstu@gmail.com *Corresponding author: Md. Abdul Ahad, Department of Entomology, Faculty of Agriculture, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200, Bangladesh. E-mail: maahadhstu@gmail.com 05 2021 1 2 40 50 Abstract

The experiments were conducted in the laboratory of the Department of Entomology and Department of Agricultural Chemistry, Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur during May-December 2017 to evaluate the toxicity of five medicinal plant extracts (water hyacinth Eichhornia crassipes, swamp smartweed Polygonum coccineum, ariach Cassia tora, wild capsicum Croton bonplandianum and hill glory bower Clerodendrum viscosum) against maize weevil, Sitophilus zeamais (Mots.) on stored maize. The wild capsicum extract provided the highest average mortality (93.33 ± 3.33), following the hill glory bower (86.67 ± 3.33) and swamp smartweed (86.67 ± 3.33) at 3% concentration. But it was zero in control. The average numbers of lowest numbers of adult emergence among the five weed extracts were found in wild capsicum (3.00 ± 0.39) following Swamp smartweed (5.11 ± 0.95) at 3% concentration; whereas, in control it was (54.00 ± 1.15). The lowest percent of seed damage were found in wild capsicum (3.00 ± 0.38%) following Swamp smartweed (4.22 ± 0.58). But in control, it was 44.00 ± 1.15. Repellency class of different plant extracts at different concentration level varied between I to IV. But the hill glory bower at 3.0% showed statistically best as it showed the highest repellency rate was 66.0 ± 5.31% and the group were IV However, the toxicity order was wild capsicum > swamp smartweed > hill glory bower > water hyacinth >, ariach.

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