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Characteristics of Some Cotton Varieties in Relation to Seasonal Abundance of Pests, Predators and Their Impact on Yield and Quality

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

M. A. Ahad
Regional Cotton Research Centre, Dinajpur, Bangladesh

M. H. Hossain
Department of Entomology, Hajee Mohammad Danesh Science &Technology University, Dinajpur, Bangladesh

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

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

Abstract/ Executive Summary:

Seven cotton varieties viz. CB-3, CB-5, CB-8, CB-9, CB-10, SR-05 and SR-01 were studied to observe their characteristics, seasonal abundance of pests, predators, and their impact on yield and quality. Results indicated that the variety CB-5 attained highest plant height (120.0 cm) produced higher number of sympodia (13.0) and GOT (41.33%). But this variety had longest duration (55.0 day) for initiation of first flower and produced lowest number of bolls (17.67/plant). Boll production was highest (29.0/plant) to the variety SR-05 but the variety CB-9 resulted highest (4.0) picking frequency. The varieties having dense hairs and trichoms (CB-9 and CB-10) are more tolerant to sucking pests. The bollworm abundance showed positive co-relation with hairy varieties and the variety SR-05 showed lowest abundance of bollworm. The variety CB-5 possessed more tolerance of armyworm, and positive relationship of predators and preys were found. The variety CB-9 with desirable plant height (115.0 cm) and number of bolls per plant (27.67) produced highest amount of yield (1650Kg/ha).

Keywords: Cotton, Variety, Pest, Predator

Location: The regional cotton research, training and seed multiplication farm, Sadarpur, Dinajpur

Start Date: 03-08-2006

End Date: 00-02-2007

Program Area: Variety and Species

Commodity: Cotton

Objectives:

1. To investigate the characteristics of different varieties in relation to the abundance of pests and predators and their effect on the yield and quality of cotton.

Methodology:

The study was performed in the regional cotton research, training and seed multiplication farm, Sadarpur, Dinajpur. The site is situated approximately between 25⁰13' latitude north and between 88⁰23' longitudes east and about 37.5 m above 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 7 varieties and each replicated 3 times. 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 2m. 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. Varieties used for this experiment were CB-3, CB-5, CB-8, CB-9, CB-10, SR-05 and SR-01. Necessary intercultural operations such as mulching, weeding and irrigation were carried out properly. The plots were exposed to natural infestation. Chemical insecticides were applied to keep damage below economic injury level. To estimate the populations of pests and beneficial insects, sampling was carried out in 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. 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. Cotton was harvested from the inner rows of the plots excluding the border rows to measure the yield/ha. Data of the different parameters were analyzed statistically and means were separated by using “Duncan’s Multiple Range Test” (DMRT).

Source of Information: J. Agrofor. Environ. 2(2): 67-70, 2008; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Findings of the study indicated that the variety CB-9 contains dense hairs and trichomes than CB-5, and found more tolerant to sucking insects. Smooth or glabrous verities are vulnerable to sucking pests. The serrated leaf variety, SR-05 is well ventilated, potential and prudent enough to protect themselves from insect attacks. On the other hand, H. armigera and B. tabaci prefers pubescent or hairy variety compared to glabrous one. The abundance of predator was higher on smooth varieties and found positively correlated with the abundance of prey. The morphological characteristics of SR-05 reduced the presence of predators.

Knowledge Management: Journal