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    PERFORMANCE OF SOME PLANT POWDERS AS STORED GRAIN PROTECTANT AGAINST PULSE BEETLE (Callosobruchus chinensis L.) INFESTING CHICKPEA

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    Date
    2015-06
    Author
    AHMED, JAHER
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    Abstract
    This study was conducted to determine the abundance and diversity of natural enemy of insect pests in boro and aman rice fields at the farm of Agricultural Training Institute (ATI), Shahparan, Sylhet during November 2013 to April 2014 for the boro rice season and May to November 2014 for the aman rice season. The results revealed that 11 and 9 different natural enemies were found in boro and aman rice fields, respectively. The abundance of natural enemies was higher in boro rice than in aman rice. The incidence of natural enemies was highest at tillering stage (50 days after transplanting, DAT) and lowest at seedling stage (30 DAT) in both the rice growing seasons. Among the natural enemies, ladybird beetle, wolf spider, damsel fly and ant were the most prevalent in the boro rice field and carabid beetle, mired bug and wasp were the least prevalent. Ladybird beetle, long-jawed spider, dipteran fly, damsel fly were the most prevalent in the aman rice field and carabid beetle, lynx spider and wasp were the least prevalent. The diversity indices of natural enemies varied between habitats and order groups in both rice growing seasons. The boro rice supported the highest diversity of natural enemies as per Shannon’ index (H) and Pielou's Evenness (J) whereas, the aman rice supported the highest richness of natural enemies as per Margalef's Index of richness. The order Araneae exhibited highest diversity and the order Coleoptera exhibited lowest diversity as per Shannon’s Index (H), Evenness (J) and Richness (M.I.) in both boro and aman seasons. The abundance of natural enemies between two seasons ranked as Boro > Aman. Among the insect orders, the abundance of natural enemies in boro season ranked as Coleoptera > Araneae > Odonata > Isoptera > Hymenoptera > Diptera > Hemiptera and the abundance in aman season ranked as Coleoptera > Araneae > Odonata > Diptera > Isoptera > Hymenoptera.
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