Abstract
To evaluate the bio-efficacy of various B.bassiana local isolates against P. marginatus in tapioca, two field trials were conducted during May-June, 2013 in tapioca crop (Var: Mulvadi) at farmer holding field, Onnipalayapudhur and Mathampalayam, near Coimbatore. The experiments were conducted in a Randomized Block Design (RBD) consisting of eight treatments including an untreated control which was replicated thrice with plot size of 5×4m2. The dose of B.bassiana tested was 1×108 spore/ml concentration. Theexperimental results showed that at 10 days after first round of spraying, the highest mean per cent reduction in the mealybug population was 32.20% due to the application of UPI(Bb). After second round of spraying, the mean per cent reduction of population observed in UPI(Bb) was56.98per cent at Onnipalayapudhur. Whereas the mean per cent reduction of mealybug population after first round of spraying in Mathampalayam was 41.95% observed in UPI (Bb) treated plot. After second round of application, the mean per cent reduction of mealybug was recorded 72.76% in UPI(Bb).
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