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Abstract

LABORATORY STUDIES OF LARVAL CHOICE BEHAVIOR OF PLUTELLA XYLOSTELLA’S 3RD INSTARS IN RESPONSE TO A BIOPESTICIDE DERIVED FROM THE BLEND OF CALOTROPIS PROCERA AND AZADIRHACTA INDICA EXTRACTS

Dr. Sabiha Khan* and Puja Dewanda

ABSTRACT

Plutella xylostella Linnaeus (Lepidoptera: plutellidae) commonly called as Diamondback Moth is one of the most notorious, cosmopolitan pest of crucifers. Studies reveal that the pest exhibits a marked preference for the Cole crops (cauliflower and cabbage) due to the presence of glucosinolates-a volatile emanant of crucifer plant. Plutella causes massive damage to the Cole crops, as a result farmers face huge economic loss. To overcome this situation, farmers extensively use chemical pesticides. The increasing eco- awareness about the potential adverse environmental effects as well as health hazards associated with the use of chemical pesticides and other agrochemicals has surged us to look for better eco-safe alternatives. Biopesticides developed from plant products could play a vital role in this perspective. The present research work studied the larval choice behavior of Plutella xylostella’s 3rd instar in response to a bio pesticide that is a mixture (1:1) of Azadirachta indica (Meliaceae) and Calotropis procera (Asclepiadaceae) plant extracts. The results were also compared with the repellent behavior of Plutella (L3) against A. indica and Calotropis extract separately. In all 34 treatments were tested. The repellent rate was also calculated and on its basis each treatments was assigned a class (I-V). Plutella (L3) showed a significant repellent behaviour against all the treatments except for these treatments: NFE +CLE (3gms+3gms)/100ml, NFE +CSE (5gms+5gms)/100ml, NFE +CSE (3gms+3gms) /100ml, NLE +CFE (3gms+3gms) /100ml, CFE (14 gms/100ml) and the Control treatment. A Repellent rate was calculated and out of all the 34 treatments, NSE+CLE (7gms+7 gms/100ml) came out with flying colors as a significant repellent and larval deterrent, with a Repellent rate 62% and classified under class IV. It should be noted that PR% for NSE (14 gms/ 100ml) and CLE (14 gms/ 100ml) separately was 52 and 46 respectively. This is quite low in comparison to the combination product and hence indicates a synergistic rationale between the two plant extracts. The calculated p-value for the combination product NSE+CLE (7gms+7gms/100ml) is less than .05, hence null hypothesis is rejected that means there is statistical significant difference between treated and the untreated counts for the treatment. Similar result was also obtained for other combination products. Thus, it can be concluded that the combination product can be used as potent larval repellent against Plutella (L3) and can play a vital role in pest management.

Keywords: Biopesticide, larval choice, repellent rate.


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