Abstract
Pesticides have been a major contributor to the growth of agricultural productivity and food supply. Pesticides were a key factor in significant agricultural productivity growth during the last century and continue to be a critical factor in reducing crop damage. Fifteen insecticides were investigated to select their effective and economic doses against Hairy caterpillar in a Tossa Jute variety during April-October’ 2020 at the Department of Entomology, Manikganj and Narayanganj, Bangladesh Jute Research Institute (BJRI), Bangladesh following Randomized Completely Block Design with three replications. All new insecticides with a standard were found effective for controlling jute hairy caterpillar giving 95.38, 94.55, 95.19, 92.85, 93.59, 94.22, 93.49, 93.62, 89.84, 95.72, 93.56, 93.38, 94.42, 95.39, 91.34 and 95.41 % at Manikganj; 95.78, 93.32, 93.97, 93.18, 92.09, 92.49, 93.74, 92.93, 92.29, 93.69, 93.95, 93.17, 95.31, 94.99, 92.11 and 94.53 % reduction of infestation at Narayanganj at 5th day after spray over control plot respectively. In Manikganj, the highest fibre yield (3.66 t/ha) was found in the plot treated with Rock 20 EC and the lowest (2.96t/ha) was found in Reset 20WDG treated plot. In case of Narayanganj, the highest fibre yield (3.85 t/ha) was found in the plot treated with Proxy 20 EC and the lowest (2.79t/ha) was found in Daman treated plot. These insecticides can be recommended for the farmer’s use to control jute hairy caterpillar.
Highlights
Jute is a principal fibre crop in the world
Dose fixation experiment was conducted at laboratory of Entomology Department, Bangladesh Jute Research Institute (BJRI), Dhaka following Randomized Complete Block Design with three replications. 3rd instar of 20 jute hairy caterpillars were kept in each plastic pot (Figure 2)
3.1 Dose fixation Three doses of all insecticides were applied at each plastic pot, where the second one was proposed by respective companies and the other two doses were higher one and lower one from the proposed dose
Summary
Jute is a principal fibre crop in the world. It is the most important cash crop and the biggest foreign exchange earner of Bangladesh. The Bihar hairy caterpillar, Spilarctia obliqua (Walker) (Arctiidae: Lepidoptera), is a widely distributed, serious polyphagous pest (Gupta and Bhattacharya, 2008). Spilosoma obliqua (walker) belongs to the family Arctiidae of Lepidoptera order is a polyphagous insect causing serious damage to a variety of crops (Bhattacharya et al.,1995). Spilarctia obliqua (walker) under the family Arctiidae of lepidoptera order is one of these destructive insect pests of jute that can reduce up to 18.5% fibre. There are many synthetic insecticides available in the local market to control jute hairy caterpillar but all are not available in all over the country and all are not effective. There are many manmade insecticides existing in the local market to control jute hairy caterpillar but all are not available through the country and all are not likewise effective. Insecticides against jute hairy caterpillar under natural condition at field level and compare with a standard chemical insecticide, (ii). to select operative and cost-effective doses of these chemical insecticides for the jute cultivator’s use
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