Anindita Roy
Department of Entomology, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Md. Sohanur Rahman
Bangladesh Jute Research Institute, Manik Mia Avenue, Dhaka 1207, Bangladesh
Md. Arifur Rahman
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Kazi Shahanara Ahmed
Department of Entomology, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Mohammad Mahir Uddin
Department of Entomology, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
The experiment was conducted in the field laboratory of the Department of Entomology, Bangladesh Agricultural University, Mymensingh on the screening of resistant variety against jute apion, Apion corchori (Marshall) and its management by using some chemical and botanical pesticides during April to August 2014. Eleven jute varieties were selected to conduct varietal preference and tested against jute apion in field condition. Among the eleven varieties, O-9897 showed the higher leaf infestation than others showing statistically similar result with O-72 and O-795. Mean percent of leaf infestation was 55.64 in O-9897 while 28.07 in BJRI Deshi pat-5, 24.89 in CVL-1, 22.11 in BJRI Deshi pat-7, 29.64 in CC-45, 24.08 in BJRI Deshi pat-8, 27.99 in D-154, 51.42 in O-795, 26.37 in BJRI Deshi pat6, 55.53 in O-72 and 39.45 in CVE-3. The lowest leaf infestation was found in BJRI Deshi pat-7 (22.11%) which was statistically similar to BJRI Deshi pat-8 (24.08%). The same trend of results was observed in case of the number of knot plant-1 and the highest knot was recorded in O-795 followed by O-72. Data revealed that the variety O-9897 was highly susceptible to jute apion followed by O-72 and O-795 whereas BJRI Deshi pat -7 had the resistant potentiality against jute apion followed by BJRI Deshi pat-8 and CVL-1. The overall preference rank of the varieties based on their resistance against jute apion was in the following order: BJRI Deshi pat-7>BJRI Deshi pat-8>CVL-1 > BJRI Deshi pat6> D-154>BJRI Deshi pat-5> CC-45>CVE-3>O-795>O-72>O-9897. In the management study, two synthetic insecticides viz., Limper 10EC, Diginol 60EC and two botanicals viz., Neem oil and Mahogany oil were evaluated. Considering different parameters, comparatively less leaf infestation percent, number of hole leaf-1 and number of knot plant-1 was found with Diginol 60EC treated plot followed by Limper 10EC treated plot. The highest infestation was found in the control plot followed by Mahogany oil applied plot. The rank of the efficacy of the treatments was Diginol>Limper>Neem oil>Mahogany oil>control. It could be concluded that BJRI Deshi pat-7, BJRI Deshi pat-8 and CVL-1 was comparatively more resistant variety considering both leaf damage and number of knot plant-1 and local variety O-9897 followed by O-72 and O-795 was highly susceptible to Jute apion. This finding would be helpful to motivate the people to use botanical insecticides i.e., Neem oil for the management of jute apion in environmentally safe condition. 8, D-154, O-795, BJRI Deshi pat-6, O-72 and CVE-3 were collected from the germplasm of Entomology Division, Bangladesh Jute Research Institute (BJRI), Dhaka and were sown in the previously prepared plots in line sowing method for varietal preference test. For the pest management experiment, only BJRI Deshi pat-5 was used. The seeds for varietal preference were sown on 26 April 2014, whereas the seeds for management experiment were sown on 3 May 2014. The plant spacing was maintained as 15 cm × 20 cm. Necessary intercultural operations such as irrigation, thinning of seedlings and weeding were done as and when necessary for the better growth and development of the jute plants in the field. Neem oil (Azadirachta indica) and Mahogany oil (Swietenia mahagoni) were used as botanicals in jute apion management experiment. Neem and Mahogany oil were collected from a company “MATI Organics Ltd.” situated at, Uttara, Dhaka. Spray suspensions of Neem oil and Mahogany oil were prepared by mixing emulsifier and sprayed once at 7 days interval @ 5 ml L-1 water + Trix @ 1ml L-1, with three replications in the field. Two chemical insecticides Limper 10EC and Diginol 60EC were used @ 1ml L-1 water and 3.5 ml L-1 of water, respectively. Spray suspensions of the insecticides were prepared using fresh tap water and sprayed once at 7 days interval with hand sprayer on upper and lower surfaces of the leaves to ensure complete coverage of the plants. A total of three spray was done with proper precautions. Varietal preference of jute apion was investigated at different stages of the plants. To find out the preference of jute apion to jute plants the following parameters- the number of total leaves, infested leaf and number of knot plant-1 were considered. Five plants were randomly selected from each plot and were considered as one replication from where leaf infestation (%), number of knot plant-1 and the number of hole leaf-1 were counted. Data were collected at every 10 days interval on the mentioned parameters. In case of pest management experiment, before application of botanicals and synthetic insecticides in the jute field, a pre-treatment data of different parameters was collected from each field. Data were counted four times as pre-treatment, first, second and third counting maintaining seven days interval after spraying of botanicals and chemical insecticides. Five plants were randomly selected from each field to count leaf infestation percent, knot plant-1 and 10 leaves were considered for counting the number of hole leaf-1. Percent leaf infestation was calculated. Cumulative mean percentage leaf infestation and hole leaf-1 were calculated from three different means of first, second and third counting. Percentage protection of leaf infestation was calculated. The recorded data from both the varietal preference test and management experiment were compiled and tabulated for statistical analysis. Analysis of variance was done with the help of computer package MSTAT-C. The mean differences among the treatments were adjudged as per test with Duncan's Multiple Range Test (DMRT) and least significant difference (LSD) when necessary.
Screening, Jute, Infestation, Management, Biopesticide
Entomology Field Laboratory of Bangladesh Agricultural University, Mymensingh
Crop-Soil-Water Management
J Bangladesh Agril Univ 17(3): 274–280, 2019
Journal