穿山龙黑斑病发生流行规律及药剂防治研究

Epidemic regularity and chemical control of Dioscorea black spot in the field

本文调查了穿山龙黑斑病的田间发生流行规律,并进行了田间药剂防治研究。结果表明,辽宁省3个穿山龙种植区均有黑斑病发生,病害的始发期为6月,盛发期为7月中、下旬,8月田间病情有所停滞,9月病情持续加重。田间病情具有垂直分布的特点。病斑直径和数量变化与田间病情动态基本一致。70%丙森锌可湿性粉剂对穿山龙黑斑病防治效果最好,防效达76%。

Epidemic and chemical control of Dioscorea black spot were systematically studied in the field. The in- vestigation indicated that Dioscorea black spot occurred in three planting areas of Liaoning Province. The begin- ning period was June; the peak period was from early to late July; the disease index was stagnated in August and aggravated in September. The disease was shown to be vertical distribution. The diameter and quantity of the spot were coincided with the field disease index. The effective chemical medicine in the field is propineb 70 WP.