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Incidence of Sucking Insect Pests on Cotton Plants Based on the Weather Conditions

Arifa Sultana Shipa
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Md Ruhul Amin
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Md Ahsanul Haque Swapon
Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Abdul Mannan Akanda
Department of Plant Pathology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Abstract/ Executive Summary:

Seasonal abundance of the sucking insect pests particularly the aphid and jassid on the cotton Gossypium hirsutum varieties CB12, CB13, CB14, CB15 and HC1, which are being cultivated in different Cotton Research and Multiplication Farms of Bangladesh, were studied from July 2018 to January 2019 at Gazipur in Bangladesh. The study also investigated the impact of weather parameters on the incidence of pests. Aphids showed their abundance from the second week of October to the third week of November and the population revealed fluctuation. Aphid population reached to the peak in the fourth week of October (31.2/leaf) on HC1 followed by CB14, CB12, CB15 and CB13 cotton varieties. The weather factors collectively predicted 79.5% to 84.6% contribution on the abundance of aphid, and the highest and lowest effects were found on the varieties HC1 and CB14, respectively. Jassids showed their abundance from the first week of November to the second week of January and reached the peak (7.2 leaf-1 ) in the fourth week of November on CB15 followed by CB12, CB13, HC1, and CB14 cotton varieties. The combined effect of the weather factors ranged from 57.4% to 71.0% abundance of jassid and the highest and lowest results were found on HC1 and CB15 varieties, respectively.

Keywords: Aphid, Gossypium hirsutum, Jassid, Temperature, Hmidity, Rainfall

Location: Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh

Start Date: 00-07-2018

End Date: 00-01-2019

Program Area: Development of Host and Medicinal Plants

Commodity: Cotton, Insects

Objectives:

The study also investigated the impact of weather parameters on the incidence of the pests.

Methodology:

Study site and conditions The study was conducted from July 2018 to January 2019 in the field and laboratory of the Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur (25°25′ N and 89°5′ E), Bangladesh. The location occupies a subtropical climate having a dry season (February to May), a rainy season (June to September) and short winter (December and January). The annual mean maximum and minimum temperatures, relative humidity and rainfall were 36.0 and 12.7 oC, 65.8% and 2376 mm, respectively (Amin et al., 2018). Cultivation of cotton plants The study was conducted with cotton, Gossypium hirsutum L. (Malvales: Malvaceae) varieties namely CB12, CB13, CB14, CB15 and Hilly Cotton 1 (HC1). These varieties were developed by the Cotton Development Board of Bangladesh. The cotton seeds were sown in the experimental plots on 2 August 2018. Each variety of cotton was cultivated in three plots following a randomized complete block design. Each plot measures an area of 3.0 m × 3.0 m and the spacing between block to block was 1.5 m and plot to plot was 1.0 m. Fertilizers were applied according to the doses of the Fertilizer Recommendation Guide of Bangladesh Agricultural Research Council (TSP 250, MoP = 175, gypsum = 175, zinc sulphate = 100, magnesium sulphate = 10 and borax = 10 kg/ ha) (FRG 2012). Intercultural operations were done on a necessity-based and the plants were grown without insecticide spray with a view to allowing insect infestation. The abundance of aphid and jassid population After the emergence of seedlings, field inspection was done weekly to record the data of the abundance of aphid and jassid on the plants. Data collection was started from the first incidence of the pests and continued until the first harvest of seed cotton. To collect data of the seasonal occurrence, five plants for each variety were randomly selected, and the numbers of nymph and adult of aphid and jassid on the shoot (apical shoot) of the plants were recorded using a magnifying glass (FD 75, Ballon Brand, China). Collection of weather data The mean daily temperature, relative humidity and rainfall data were collected from the weather station of BSMRAU and calculated into the standard meteorological week. Data analysis Pearson correlation between the abundance of the insects and meteorological parameters, and multiple regression model along with the abundance of the insects and meteorological factors were analyzed. All the analyses were performed using IBM SPSS 21.0.

Source of Information: J Bangladesh Agril Univ 19(1): 8–13, 2021 ISSN 1810-3030 (Print) 2408-8684 (Online)

Article Link (Online Journal): https://doi.org/10.5455/JBAU.24989

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The abundances of the sucking insects were found according to the characteristics of the tested cotton varieties, and the weather factors affected the population of the insects. Aphid and jassid depicted low levels of abundance on CB13 and HC1 varieties, respectively.

Knowledge Management: Journal