厚皮甜瓜细菌性果斑病标准化综合防控技术

为有效防控厚皮甜瓜细菌性果斑病的发生,提出一套综合防控技术,通过田间开展各单项防控技术的重要性试验,建立标准化综合防控技术体系。结果表明:各单项技术可提高对细菌性果斑病的防效。与对照相比,72%农用硫酸链霉素可溶粉剂浸种可使防效提高16%,病果率降低3%;标准化喷药能使防效提高17%以上,病果率降低3.1%;整枝打杈前后进行防控能使防效提高39%以上;厚皮甜瓜整个生育期不浇水,能够减少病果的数量;在此基础上组装而成的标准化综合防控技术体系防效达89.2%以上,病果率仅为2%。

Standardization of the integrated management of bacterial fruit blotch disease in muskmelon

Bioactivity of sulfoxaflor against Aphis gossypii Glover was determined by using leaf-dip method and its bio-safety to cotton was also tested with field trials. The results showed that LC50 and LC90 of sulfoxaflor against cotton aphid were 1.98 mg/L and 26.02 mg/L after treatment for 24 h, respectively, significantly lower than that of imidacloprid, which were 8.69 mg/L and 132.68 mg/L, respectively. The toxicity ratio of both insecticides was 4.39. After 48 h, sulfoxaflor still possessed a high insecticidal activity against cotton aphid. Field trials demonstrated that sulfoxaflor had no harm to cotton. Leaf color, plant height, fruit-branch layer and cotton square abscission in plots sprayed sulfoxaflor 500 g/kg WG at the recommended dosages had no significant difference with those without treatment by insecticides.