小麦白粉病菌分生孢子田间传播的初步研究

2015年度采用定容式孢子捕捉器对田间空气中小麦白粉病菌分生孢子传播的初步研究表明,在病害发生初期病菌分生孢子捕捉量比较低,但随着菌源中心病害的逐渐加重,病菌分生孢子在距菌源中心20 m和40 m远处捕捉量随之增大。线性弧度相关分析结果发现,距菌源中心北向20 m和40 m处的孢子捕捉量与风向存在显著正相关性;距菌源中心不同距离处的孢子捕捉量之间均存在极显著正相关性,且在相同方向上,距菌源中心20 m处孢子捕捉量显著高于40 m处孢子捕捉量。

A preliminary study on the dispersal of aerial conidia of Blumeria graminis f.sp. tritici in wheat fields

The dispersal of Blumeria graminis f.sp. tritici (Bgt) conidia in the air was preliminarily studied by Burkard volumetric spore sampler in 2015, showing that the captured number of pathogenic conidia was low during the early epidemic period of wheat powdery mildew, however, the number of Bgt spores captured from 20 m and 40 m away from the north or east of the pathogen source center increased along with disease epidemic development. The results of linear-circular correlation analysis showed that the number of Bgt spores captured from 20 m and 40 m away from the north of the pathogen source center was significantly and positively correlated with wind direction. The number of Bgt spores captured by each spore trap was significantly and positively correlated with each other, and in the same direction, the number of pathogen spores captured from 20 m away from the pathogen source center was significantly higher than that at 40 m.