ABUNDANCE AND FLUCTUATION PATTERNS OF INSECT PESTS IN COUNTRY BEAN

AU Khan, MAR Choudhury*, MS Islam and MA Maleque1
Journal of the Sylhet Agricultural University, Volume 5, Issue 2, 2018, Pages 167-172

Abstract:

A field study was conducted to assess the population abundance and fluctuation pattern of major insect pests of country bean under natural condition. The research was done in the farm field of the Department of Entomology, Sylhet Agricultural University, during summer and winter seasons of 2017-2018. Five insect species were found, among them aphid (Aphis craccivora Koch), pod borer (Maruca testulalis G.) and epilachna beetle (Epilachna dodecastigma) were recorded in both seasons and shoot borer (Acrobasis caryae) and field cricket (Brachytrypes portentosus) were found in winter and summer season, respectively. The highest number of accumulated populations of aphid was 408.74 and 205.89, pod borer was 249.99 and 95.45 and epilacha beetle was 57.69 and 43.5 plot-1 in winter and summer season, respectively. The relative abundances of aphid were 55.58% and 59.24%; Pod borer was 33.92% and 27.46; Epilachna beetle was 7.76% and 12.42% in winter and summer country bean field, respectively. The major insect pest of bean aphid incidence varied among the vegetative, flowering and fruiting stages which were 120 and 85, 150 and 74 and 135 and 65 in winter and summer country bean plot-1, respectively. Conversely, other major pest of country bean was pod borer mainly infesting flowering and fruiting stages and number was varied 15 and 13 and 235 and 85 in winter and summer, respectively plot -1. Aphid and pod borer were found as major pests and field cricket, epilachna beetle and shoot borer were found as minor pest in country bean agroecosystem.

Keywords:

Lablab purpureus, insect pest, natural conditions.21


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AU Khan, MAR Choudhury*, MS Islam and MA Maleque1. 2018. ABUNDANCE AND FLUCTUATION PATTERNS OF INSECT PESTS IN COUNTRY BEAN, Journal of the Sylhet Agricultural University 5(2): 167-172.