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ABSTRACT: The experiment was carried out with mustard Brassica juncea variety BARI Shorisha-11 to know the abundance, richness and diversity of foraging arthropods in the mustard field during September 2016 to March 2017 at Gazipur in Bangladesh. In this study, mobile arthropods were collected with sweep net and sweeping was done at weekly interval from seedling stage of the plant to maturity of the siliqua. A total of 311 arthropods were collected from the field which belonged to 19 species of 19 different families and 7 Orders. Among the arthropods, 5 species were found as insect pests which belonged to 4 families of 3 Orders. There were 5 species of predators of 3 families under 2 Orders. The pollinators were statistically higher in abundance and richness compared to pests, predators and other categories of arthropods but the pests prevailed with higher diversity. Cabbage white fly and flea beetle showed the highest and lowest abundance of insect pest species, respectively. All the predator insects belonged to the Order Odonata and Coleoptera, and the abundance of the predator insects did not differ significantly.
Keywords: Abundance, Brassica juncea, diversity, insects, spiders
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