十大功劳白粉病发生规律与防治方法研究

十大功劳白粉病是近年来合肥地区危害较为严重的一种真菌性病害。通过对十大功劳抽梢时间、白粉病发生时间以及与温湿度之间的关系进行研究，并利用5种农药在不同时间进行防治试验，结果表明：十大功劳抽梢时间在3月下旬（5月30日），白粉病发生于4月中旬（4月18日）；抽梢时日平均气温为15．5℃，病害发生时日平均温度在18℃左右。通过0．05与0．01水平上的方差分析，可以看出：发病前防治效果明显优于发病后防治；3种药剂防治效果以15％粉锈宁1500倍防治效果最好，1％等量式波尔多液次之，50％多菌灵1500倍防效最差。

Occurrence Discipline and Prevention of Mahonia Powdery Mildew

Powdery mildew of Mahonia fortunei is a kind of mycosis which causes seriously harm in the region of Hefei. The essay researched the relation between the shooting time of Mahonia fortunei, time of onset and humiture,and adopted three kinds of farm chemical to prevent powdery mildew in different time. The results show that： Mahonia fortunei began to shoot in late March（March 20）; powdery mildew started to appear in middle April（April 18）.The average temperature was 15.5℃ when Mahonia fortunei shot,and the average temperature was 18 ℃ when powdery mildew appeared. Through analysis of variance of 0.05 and 0.01, the research could conclude that the effect of prevention before powdery mildew appeared was more excelled than after powdery mildew appeared.The effect of prevention using 1500 times triadimefon of 15% consistency was better than using the same times Bordeaux mixture of 1% consistency, and the effect of prevention using 1500 times carbendazim of 50% consistency was relatively bad.