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Effect of Some Systemic Insecticides on the Abundance of Major Insect Pests and Predators Associated with Cotton Plants

M.R. Amin
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

M.A. Ahad
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

N.A. Rasel
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

S.M.A. Hossain
Regional Cotton Research Centre, Dinajpur, Bangladesh

D.A. Tithi
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted to evaluate the effectiveness of seven systemic insecticides viz. asataf 75SP, admire 200SL, imitaf 20SL, dursban 20EC, chloropyriphos 20EC, actara 25WG and murshal 20EC against different sucking and chewing pests of cotton. The effects of these insecticides were also tested on the abundance of different predator populations. Findings of the study indicated that the chemicals admire 200 SL, actara 25WG and imitaf 20SL were more confident and prudent to control the pests of cotton. But the effects of these chemicals abruptly reduced the abundance of different predator populations. On the other hand, the insecticides: asataf 75SP, dursban 20EC and murshal 20EC showed moderate efficacy on pests and abundance of natural enemies.

Keywords: Cotton, Pests, Predator, Insecticides

Location: Regional cotton research, training and seed multiplication farm, Dinajpur, Bangladesh

Start Date: 00-08-2006

End Date: 00-11-2006

Program Area: Pest Management

Commodity: Cotton

Objectives:

1. To evaluate the effectiveness of seven systemic insecticides viz. asataf 75SP, admire 200SL, imitaf 20SL, dursban 20EC, chloropyriphos 20EC, actara 25WG and murshal 20EC against different sucking and chewing pests of cotton.

Methodology:

The study was performed in the regional cotton research, training and seed multiplication farm, Dinajpur, Bangladesh. The site is situated approximately 25^o13' latitude north and 88^o23' longitude east and about 37.5 m above from the sea level. The soil was sandy loam with pH 4.5 to 5.5. Previous crop of the plot was sunheamp as a green manure. Irrigation and drainage facilities were readily available in the farm. The Land was prepared at field condition by deep ploughing and harrowing followed by laddering. The field layout was done after final land preparation. The experiment was conducted in randomized complete block design with the cotton variety CB-10. The plot size was 5.4 × 5 m. The spacing between block-to-block and plot-to-plot were 1.5 and 1m and respective footpath was 2 m. Seeds were sown on 3rd August 2006, at the rate of 15 kg /ha in a north-south row. The seeds were sown by hand keeping a distance of 45 cm from plant to plant and row-to-row distance was 90 cm. Necessary intercultural operations such as mulching, weeding and irrigation were carried out properly. Seven insecticides such as asataf 75SP (acephate), admire 200SL (imidachloprid), imitaf 20SL (imidachloprid), dursban 20EC (chlropyriphos), chloropyriphos 20EC (chlropyriphos), actara 25WG (thiomethoxam) and murshal 20EC (carbosulfan) were used for the experiment. Spraying was done by a knapsack sprayer. To estimate the populations of pests and beneficial insects, sampling was carried out from the cotton field in the entire cotton growing season (August to November). It was done by weekly scouting taking 5 plants randomly from each replication. Plants were examined for jassid (Amrasca bigutulla), aphid (Aphis gossypii), whitefly (Bemisia tabaci), american bollworm (Helicoverpa armigera), spotted bollworm (Earias vittella), army worm (Spodoptera littoralis), pink bollworm (Pectinophora gossypiella), thrips (Thrips tabaci), bugs (Dysdercus cingulatus). Newly growing parts with two fully expanded leaves were examined for sucking pests and beneficial insects, middle parts for army worm and twigs, flowers, squares and bolls for bollworm. During examination of the plant, number of different beneficial insects such as lady beetle, spider and syrphids were recorded. A scouting form was used during estimation of the pests. Data of the different parameters were analyzed statistically and means were separated by Duncan’s Multiple Range Test (DMRT).

Source of Information: J. Agrofor. Environ. 2(2): 143-146, 2008; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Findings of the study indicated that the systemic insecticides such as admire 200SL, actara 25WG and imitaf 20SL are confident and prudent enough to control the sucking pests of cotton. These insecticides also suppressed the bollworms and showed toxic effect on the predators.

Knowledge Management: Journal