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对生长季马铃薯冠层空气中Aternaria solani(Ell.&G.Martin)分生孢子的数量和马铃薯早疫病发生程度进行了系统调查,并对空气中分生孢子数量与早疫病发生程度之间的相关性以及影响空气中分生孢子数量的因素进行了分析。结果表明:在马铃薯出苗至收获(6~8月份)期间,当病情指数低于4时两者之间呈显著线性相关关系,随着病情指数的增高二者的线性相关性降低。天气条件对空气中A.solani分生孢子数量的影响明显,通常降雨2 d后空气中孢子的数量会有一个高峰,日平均气温(地上2 m)低于18℃的条件下,空气中孢子数量会显著减少。一天中6∶00 am至16∶00 pm空气中A.solani分生孢子数量较多,17∶00 pm至次日5∶00 am孢子数量较少,分别占全天总量的60.95%和39.05%,各小时孢子飞散量占全天比例与空气相对湿度呈显著负相关,而与空气温度呈显著正相关。
The number of conidia of Aternaria solani (Ell. & G.Martin) and the occurrence of potato early blight in the canopy air of the growing season were systematically investigated. The correlation between the number of conidia in the air and the occurrence of early blight Sex and the factors affecting the number of conidia in the air were analyzed. The results showed that there was a significant linear correlation between the two indexes when the disease index was lower than 4 during the period from emergence to harvest (from June to August), and the linear correlation decreased as the disease index increased. The influence of the weather conditions on the number of A.solani conidia in the air is obvious. Usually, the number of spores in the air after 2 days of rainfall will have a peak. Under the condition that the average daily temperature (2 m above ground) is lower than 18 ℃, The number will be significantly reduced. In the day 6:00 am to 16:00 pm, there were more conidia of A.solani in the air, fewer spores from 17:00 pm to 5:00 am the next day, accounting for 60.95% and 39.05 of the total amount of day %, The ratio of spore scatter in every hour was significantly and negatively correlated with air relative humidity, but positively correlated with air temperature.