ABUNDANCE AND DIVERSITY OF BENEFICIAL INSECT AND SPIDER SPECIES ON RICE ECOSYSTEM IN SYLHET REGION

M Rahman, M A Maleque, M S Uddin and J Ahmed
Journal of the Sylhet Agricultural University, Volume 4, Issue 1, 2017, Pages 63-70

Abstract:

An attempt was made to determine the abundance and diversity of beneficial insect and spider species on Boro rice during the period of November 2013 to April 2014 and Aman rice during May to November 2014 at Agricultural Training Institute (ATI) farm in Sylhet district. A considerable number of beneficial insect and spider species namely ladybird beetle, carabid beetle, ground beetle, damselfly, mirid bug, ant, wasp, dipteran fly, lynx spider, wolf spider, jumping spider and long-jawed spider were found abundant at all growing stages in both rice fields. The relative abundance of insect and spider species in Boro rice ranked as ladybird beetle>damselfly>ant>wolf spider>jumping spider>ground beetle>wasp>tachinid fly>lynx spider>carabid beetle>mirid bug; whereas in Aman rice it was ranked as ladybird beetle>damselfly>long-jawed spider>dipteran fly>jumping spider>lynx spider>ant>wasp> carabid beetle. Araneae order showed the highest values while Coleoptera order showed the lowest values for Diversity index and evenness in both Boro and Aman rice. Richness index was found highest in Araneae order in Boro rice and lowest in Coleoptera order in Aman rice fields. The results clearly indicate that rice ecosystem could be utilized as a great reservoir of beneficial insect and mite species and thus rice ecosystem would foster natural biological control process in rice based agroecosystems all over Bangladesh especially in the Sylhet region.

Keywords:

Beneficial insect, rice ecosystem, biodiversity, rice season.


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M Rahman, M A Maleque, M S Uddin and J Ahmed. 2017. ABUNDANCE AND DIVERSITY OF BENEFICIAL INSECT AND SPIDER SPECIES ON RICE ECOSYSTEM IN SYLHET REGION, Journal of the Sylhet Agricultural University 4(1): 63-70.