Field trials of emulsifiable suspensions of Beauveria bassina conidia for control aphid in shoot bamboo
2007
SUN Pin-lei | LU Gang | CHEN Wei-ming | HUANG Zhao-gang | XUE Wen-yue
An emulsifiable formulation of Beauveria bassina conidia (Bb) produced using a diphasic fermentation technology was tested for efficiency against aphids infecting the bamboo shoots in Yuhang of Zhejiang Province during March and May 2003. Three aqueous dilutions (1×10<sup>7</sup>, 1×10<sup>5</sup> and 1×10<sup>5</sup> conidia·mL<sup>-1</sup>) were sprayed onto bamboo crown with water as negative control and 1000-fold dilution of imidacloprid 10% wettable powder (WP) as positive control. The results showed that the relative control efficacy against bamboo aphids on selected shoots with three dilutions was 60.0%, 75.1%, and 80.7% within 7 days after spray, respectively. With the increase of the conidia concentration, the control efficacy was enhanced. In the block test, the relative efficiencies against bamboo aphids reached up to 90.8% and in the extensive field trials, 87.9% aphids were killed after spray 7 days. The efficacy was close to what achieved by spraying the 1000-fold dilution of imidacloprid 10% WP. It was concluded that the Beauveria bassina is effective in control for aphids in shoot bamboo.
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