FIELD EXPERIMENTS ON BEAUVERIA BASSIANA (STRAIN# 147 AND#9)TO CONTROL ASIATIC CORN BORER
DU Changxi
Abstract
DU Changxi
Abstract
Field experiments were conducted using strains 147 (French strain) and 9 (Chinese strain) of Beau-veria bassiana to control Asiatic corn borer (Ostrinia furnacalis) in Jilin in 1984. A granular preparation was applied once at a dose of 6×1013 spores/hectare. Populations of the 1st and 2nd generation of corn borer larvae decreased95.27-96.62% and 75.55-84.28%, respectively. An increase of 72.77-83.60% and 29.21-50.7% of infected larvae was found for the two generations respectively. It was found that the effectiveness of strain 147 was better than strain 9 for controlling corn borer larvae of 1st generation, but poorer for 2nd generation. The difference might be due to a shorter residual period of 147. No synergetic effect was found when the two granular preparations were used together.
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Field experiments were conducted using strains 147 (French strain) and 9 (Chinese strain) of Beau-veria bassiana to control Asiatic corn borer (Ostrinia furnacalis) in Jilin in 1984. A granular preparation was applied once at a dose of 6×1013 spores/hectare. Populations of the 1st and 2nd generation of corn borer larvae decreased95.27-96.62% and 75.55-84.28%, respectively. An increase of 72.77-83.60% and 29.21-50.7% of infected larvae was found for the two generations respectively. It was found that the effectiveness of strain 147 was better than strain 9 for controlling corn borer larvae of 1st generation, but poorer for 2nd generation. The difference might be due to a shorter residual period of 147. No synergetic effect was found when the two granular preparations were used together.
Key concepts: Beauveria bassiana, Ostrinia furnacalis, Strain (injury), Larva, Biology, Field corn, Bassiana, Spore