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Insect Pests of Country Bean and Their Relationships with Temperature

AU Khan
Department of Entomology, Sylhet Agricultural University, Sylhet-3100, Bangladesh.

MAR Choudhury*
Department of Entomology, Sylhet Agricultural University, Sylhet-3100, Bangladesh.

Abstract/ Executive Summary:

The study was conducted to know the insect pests damaging country bean Lablab purpureus plants in Sylhet Agricultural University Campus, Sylhet, Bangladesh, and to find out the relationships of the abundances of the insect pests with number of bean pods and prevailed temperature during the study period. Aphid Aphis craccivora (Hemiptera: Aphididae), epilachna beetle Epilachna duodecastigma (Coleoptera: Coccinellidae), shoot borer Acrobasis caryae (Lepidoptera: Pyralidae)andpod borer Maruca testulalis (Lepidoptera: Crambidae)were found as the insect pests of country bean plants. Aphid and pod borer showed significant positive relationship with number of pods of country bean and temperature. Abundances of ephilachna beetle and shoot borer were negatively correlated with the number of pods of the country bean.

Keywords: Lablab purpureus, Sylhet, Temperature, Yield

Location: Department of Entomology, Sylhet Agricultural University, Sylhet, Bangladesh

Start Date: 00-00-2017

End Date: 00-00-2018

Program Area: Pest Management

Commodity: Insects

Objectives:

The present research was conducted to identify the insect pests of country bean in Sylhet region and to find out the relationships between the abundances of the prevailed insect pests with ambient temperature.

Methodology:

Study location and duration: The study was conducted in the field laboratory of the Department of Entomology, Sylhet Agricultural University, Sylhet, Bangladesh in winter season from 2017-2018. The area is hilly and located at 23°57" to 25°13" N and 90°56" to 92°21" E, and surrounded by Megalaya State of India. Cultivation of bean plant: Seeds of the country bean (variety BARI sheem 1, BARI sheem 6, IPSA Seem-2 and Goalgadda sheem) were collected from the Department of Horticulture of Sylhet Agricultural University and local market, respectively. The study was arranged in Randomized Complete Block Design (RCBD) with three replications. The unit plot size was 3.0 m × 2.0 m accommodating single row and three pits per bed. Plant spacing was 1.0 m and 3 pits were prepared for seedling transplantation. The number of plots per treatment was three, and spaces between blocks and between plots were 0.5 m and 1.0 m, respectively. Seeds were sown on 20 October 2017 in rows. Each plot contained 1 row with 3 pits separated by 60 cm. After the emergence of seedlings, the plants were supported by bamboo sticks to facilitate creeping. The manures and fertilizers were applied according to the recommended doses of the Bangladesh Agricultural Research Institute. Mulching, weeding, irrigation, etc. were done whenever necessary. The soil of field belongs to the Khadimnagar soil series of Eastern Surma-Kushiara Floodplain under the Agroecological zones-20 (FAO, 1988). Insect collection and identification: Insects were captured using sweeping net having 30 cm diameter ring and 1.5 mm mesh, and attached with a 2 m long rod. A vacuum suction sampler was also used to capture very small insects. Insects were collected at weekly interval from seedling to last harvest of bean. Every collection date, both sweep net and vacuum suction sampling were done 30 times. For borer pest’s visual searching method were used. In every stage (vegetative, flowering and reproductive) every part of each plant viz. lower, middle and higher part four leaves was selected and observed. The collected insects were brought from the experimental field to the Entomology Laboratory of Sylhet Agricultural University and stored in a freezer for a few hours to kill, then mounted on points, dried and morphotyped. For identification, the insects were compared with the specimens in a labeled collection and compared with pictures or descriptions. The identified insects were categorized and their relative abundance were calculated. Collection of weather data: The meteorological parameter (temperature) were collected from weather station of Sylhet town and correlated with population of country bean insect pest through Microsoft Excel Program.

Source of Information: Bangladesh J. Ecol. (2020) 2 (1) : 43-46

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It can be concluded that insect pests of country bean and their relationship with the bean pod and temperature is significantly correlated. The abiotic (temperature) and biotic factors (Insect morph & behavior) are more important to develop the insect population of country bean.

Knowledge Management: Journal