Gut bacterial influence on susceptibility of lepidopteran pests to Bacillus thuringiensis subsp. kurstaki

Gut bacterial influence on susceptibility of lepidopteran pests to Bacillus thuringiensis subsp. kurstaki



Hanamant Gadad, A S Vastrad, Krishnaraj P. U



Influence of gut bacteria on susceptibility of
lepidopteran pests viz., Spodoptera litura, Helicovepa armigera,
Plutella xylostella and Crocidolomia binotalis to Bacillus thuringiensis
subsp. kurstaki was studied by antibiotic mediated elimination of gut
bacteria. Bioassay was performed against laboratory reared and field
collected larvae of test insects to study the influence of gut bacteria
on susceptibility of lepidopteran pests to B. thuringiensis subsp.
kurstaki. Results indicated that both lab and field population of test
insects were more susceptible in the presence of gut bacteria by
recording lower LC50 values against B. thuringiensis subsp. kurstaki.
Field population of test insects viz., S. litura, H. armigera, P.
xylostella and C. binotalis recorded LC50 values of 0.62, 0.48, 0.77 and
0.44 g/l, whereas laboratory population recorded LC50 values of 0.37,
0.32, 0.48 and 0.29 g/l respectively. In the absence of gut bacteria
both laboratory reared and field collected larvae found less susceptible
by recording higher LC50 values. Antibiotic treated field collected
larval population of test insects viz., S. litura, H. armigera, P.
xylostella and C. binotalis recorded LC50 values of 0.74, 0.54, 1.07 and
0.56 g/l respectively. Similarly antibiotic treated laboratory reared
larval population of test insects recorded LC50 values of 0.49, 0.38,
0.57 and 0.43 g/l respectively. 



10.22161/ijeab/1.3.41



http://ijeab.com/upload_document/issue_files/41%20IJEAB-OCT-2016-5-Gut%20bacterial%20influence%20on%20susceptibility%20of%20lepidopteran%20pests%20to%20Bacillus%20thuringiensis%20subsp.%20kurstaki%20.pdf



http://ijeab.com/submit-paper/

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