Effects of entomopathogenic fungi Beauveria bassiana (Balsamo) Vuillemin and Metarhizium anisopliae (Metchnikoff) sorokin on teak defoliator (Hyblaea puera Cramer) (Lepidoptera: Noctuidae)
1998
Watana Sakchoowong
Studies on the effects of entomopathogenic fungi B. bassiana and M. anisopliae on teak defoliator, H. puera, was carried out at Forest Entomology Laboratory, Royal Forest Department. The objectives were to study the pathogenic virulence and comparative efficiency of the entomopathogenic fungi B. bassiana and M. anisopliae for controlling teak defoliator, H. puera in the laboratory. Five conidial density levels of conidial suspension were tested as follows: 2*10*[8), 2*10*[7), 2*10*[6), 2*10*[5) conidia/ml and distilled water. The fungi at 1.0 ml were topically applied to the 3rd instar larvae of H. puera. The processes were done for 4 generations of fungi (repeated 4 times). The results showed that both B. bassiana and M. anisopliae were pathogenic to the larvae. The average percent mortality of larvae for B. bassiana and M. anisopliae was 60.24 and 37.69 percent respectively. Mortality of the larvae depended on conidial density and species of fungi. The lethal concentration value (LC50) of B. bassiana and M. anisopliae at the 3rd instar larvae of H. puera was 1.40*10*[6) and 2.19*10*[8) conidia/ml respectively. The study showed that B. bassiana was more pathogenic than M. anisopliae B. bassiana can be considered as a promising biological control agent for H. puera.
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