원문정보
초록
영어
Mortality of larvae of Spodoptera exigua by various entomopathogenic fungal strains were examined to select an efficient strain for the control the pest. To determine the virulence of the fungi, 108 conidia/㎖ｦ suspension of each strain was sprayed onto 10 larvae on a dampened filter paper in a petri-dish. Mortality of larvae was recorded daily over 15 days and strain No. 78, 216, 218 and 500 among 28 different strains of entomopathogenic fungi showed relatively high mortality of larvae at temperature of 25℃ and relative humidity of 70%. The aerial conidia production of the various fungal strains by solid state fermentation were also examined using several solid media. Excellent production of conidia was accomplished by using wheat bran powder for the strain No. 218, polished rice for the strain No. 198, and barley for the strain No. 218, respectively. From the results, strain No. 218 was selected as the best strain for production of conidia as well as control of larvae.