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Frass production (g) in last instar H. armigera treated with endophytic B. bassiana (Bb: 1 × 105 conidia ml–1) alone and in combination with B. thuringiensis (Bt1: 0.20 μg ml–1). Means followed by the same letter within each treatment are not significantly different; HSD test P ≤ 0.05.
