Efficacy Evaluation of 16% Validamycin·thifluzamide SC against Selerotium rolfsii in Dendrobium officinale Kimura et Migo

[Objective] The paper was to understand the control efficacy and the optimal dosage of 16% validamycin？thifluzamide SC on controlling Selerotium rolfsii in Dendrobium officinale Kimura et Migo. [Method] The control efficacy of 16% validamycin·thifluzamide SC against S.rolfsii was determined by spraying agents on the whole plant of D.officinale. The significance of differences was analyzed by Duncan＇s new multiple range test （DMRT）. [Result] The control efficacy of 16% validamycin.thifluzamide SC sprayed at the doses of 80-160 mg a.i./kg was 85.33% at 14 d post spraying, higher than that of control agent 4% validamycin AS sprayed at the dose of 80 mg a.i./kg （78.36%）, and equivalent to that of control agent 240 g/L thifluzamide SC sprayed at the dose of 120 mg a.i./kg （90.60%）. [Conclusion] 16% Validamycin·thifluzamide SC sprayed at the doses of 80-160 mg a.i./kg could effectively control the damage of S.rolfsii in D.officinale, and could be popularized in the production.

向日葵菌核病菌核秋季田间生成量的估算

通过田间调查及室内分析,从198个病盘分一、二、三、四级分别建立四个指数方程。可作为估算秋季田间病盘上菌核生成量的依据。

16%井冈·噻呋SC防治铁皮石斛白绢病药效评价

[目的]明确16%井冈·噻呋SC对铁皮石斛白绢病的防治效果及使用剂量。[方法]采用对整个植株喷雾法检测防治效果,以邓肯新复极差法检验差异显著性。[结果]16%井冈·噻呋SC 80~160 mg a.i./kg剂量处理,药后14 d,防效85.33%以上,高于对照药剂4%井冈霉素水剂80 mg a.i./kg的防效78.36%,与对照药剂240 g/L噻呋酰胺悬浮剂120 mg a.i./kg的防效90.60%相当。[结论]16%井冈·噻呋SC以80~160 mg a.i./kg剂量处理,能有效控制铁皮石斛白绢病的为害,可以在生产上推广使用。