寒地稻瘟病菌空中捕捉量与田间稻瘟病发病和气象因子的关系

Relationship of the Amounts of Germs of Rice Blast Caught in the Air with the Incidence of Rice Blastin the Field and the Meteorological Factors in Cold Region

为及时掌握稻瘟病菌发生的时空动态,有效控制病害发生,采用固定式孢子捕捉器对水稻品种空育131空中稻瘟病菌孢子量与田间稻瘟病发病关系及其与气象因子的关系进行了研究。结果表明：空中孢子的捕捉数量与叶瘟的发病率呈正相关,相关系数为0.848 4。每个检测单位（检测面积为18 mm×18 mm视野内的孢子数量）稻瘟菌孢子数量达到1-2个,可作为叶瘟进行药剂防治的参数。孢子数量与平均温度呈正相关,相关系数为0.181 0;与降雨量呈负相关,相关系数为-0.342 1;与空气相对湿度呈正相关,相关系数为0.120 3;与最大风速呈负相关,相关系数为-0.227 5。

Adopting the fixed type spore catcher to monitor the amount of the Pyricularia oryzae in the air,the relationship of the amount of rice blast spores in the air of Kongyu 131 with the incidence of rice blast and meteorological factors was studied. The results showed that it was positive correlation between the amount of spores caught in the air and the incidence of leaf blast with a correlation coefficient of 0. 848 4. The amount of the Pyricularia oryzae spores in each testing unit（the amount of the spore envisaged in the area of 18 mm× 18 mm）came up to one or two,which would be used as parameter to chemical control against the leaf blast. It also showed that there was a positive correlation between the amount of the spores and the average tempera- ture,with a correlation coefficient of 0. 181 0, while there was a negative correlation between the rainfall and the amount of the spores whose correlation was -0. 342 1. Meantime,the amount of the spores and the air relative humidity was positively correlated,and the correlation coefficient was 0. 120 3. But it was negatively correlated with the wind speed with a correlation coefficient of -0. 227 5.