采前嘧菌酯处理对“银帝”甜瓜采前及采后主要病害的控制

研究了田间嘧菌酯处理对“银帝”甜瓜采前霜霉病、白粉病和果实真菌潜伏侵染带菌率及采后粉霉病、白霉病的控制效果。结果表明:采前喷撒100～400 mg/L嘧菌酯对甜瓜生长期间的白粉病和霜霉病均有很好的控制作用;可以明显降低果实生长发育期间潜伏侵染的真菌带菌率;还可有效降低采后常温贮藏期间粉霉病和白霉病的发病率,其中以400 mg/L处理效果最好。嘧菌酯采前处理4次的效果优于3次。对照药物500 mg/L扑海因处理也可以降低上述各类病害,但效果不及400 mg/L嘧菌酯处理。

Control of pre- and postharvest main diseases on melon variety Yindi with preharvest azoxystrobin spraying

The control effects of preharvest azoxystrobin (AZX) treatments on downy mildews, powdery mildews and latent infection rate of fruits and pink rot, Fusarium rot on the fruits of Cucumis melo cv. Yindi, a melon variety widely planted in recent years, were investigated in the paper. The results indicated that AZX from 100 mg/L to 400 mg/L treatment reduced significantly severity of downy mildews and powdery mildews, latent infection rate of fruits, and the disease incidence of postharvest pink rot and Fusarium rot. The treatment at 400 mg/L of AZX showed the best control. 4 times of AZX preharvest spraying was better than 3 times. 500 mg/L of iprodione treatment could also decrease the diseases incidence; however, the effect was not as good as 400 mg/L of AZX.