National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Six strains of Beauveria bassiana were isolated from different sources collected from different places of Tamil Nadu and tested their efficacy under laboratory condition against crawler stages of papaya mealybug by insect dip bioassay method. The results revealed that B. bassiana strains, UPI (Bb) and ANR (Bb) were recorded the lowest LC50 values of 2.11 x106, 2.37x107 spores ml-1 respectively which were indicated more virulence compared to other strains. The LC50 values of rest of the strains of B. bassiana viz., AVI (Bb), KPI (Bb), PLR (Bb), and TMR (Bb) were 6.81x107, 9.28 x107, 9.89x107 and 1.24x108 spores ml-1. At the highest concentration of 1x108 spores ml-1, the median LT50 values for different strains of B. bassiana viz., UPI (Bb), ANR (Bb) , AVI (Bb), KPI (Bb), PLR (Bb) and TMR (Bb) were 3.71, 5.97, 7.72, 8.71, 9.25 and 9.71 days respectively. Median lethal values were found to be inversely proportional to the spore concentration of B. bassiana
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