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Comparison of lethal concentration of mycoinsecticide against Riptortus pedestris (F.) and its parasitoid
Lethal concentration of Beauveria bassiana (Strain GHA, Botanigard, Arysta LifeScience) against Riptortus pedestris (F.) (Hemiptera: Alydidae) was compared with that of its’ parasitoid Ooencyrtus nezarae Ishii (Hymenoptera: Encyrtidae). Five concentrations of the mycoinsecticide, i.e., 5×108, 1×108, 2×107, 4×106, and 8×105 conidia/ml, were used. Glass scintillation vial was coated with 100 μl solution, and insects were released and assessed up to 12 hours. The LC50 and LC20 of second instar R. pedestris were 1.8×1010 and 1.5×108 conidia/ml, and those of O. nezarae were 1.9×107 and 2.8×106 conidia/ml, respectively. The mortality of O. nezarae was observed 3.9 times higher than R. pedestris in higher concentration. This result shows that O. nezarae is more susceptible to the mycoinsecticide than R. pedestris.
