The release and adhesion of spores of Alternaria alternata tobacco brown spot was studied quantitatively in the experiment. The results showed that the relationship between spores quantity and the height above ground level was exponential.

• 对烟草赤星病菌孢子的释放及附着进行了定量研究 ,结果表明 :附着在烟草叶面上的孢子数量与地面以上高度呈指数关系 ,并随地面以上高度的升高而减少 ;