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为了研制防治马铃薯晚疫病的种衣剂 ,利用菌落直径法测定了 4种内吸性杀菌剂对致病疫霉菌的毒力并检测了它们对马铃薯出苗的影响。测定结果表明 ,灭克锰锌和甲霜灵对晚疫病菌的毒力最强 ,其中EC50 s分别为 1.5 5μg·mL-1和 1.6 3μg·mL-1;霜霉威对晚疫病菌的毒力次之 ,其中EC50 为 5 .43μg·mL-1;乙磷铝对晚疫病菌毒力最差 ,其EC50 为 2 46 .5 8μg·mL-1。但是由于灭克锰锌严重影响马铃薯出苗率 ,所以 ,甲霜灵和霜霉威被选为防治马铃薯晚病种衣剂的有效成分。室内接种薯片培养试验证明 ,高浓度 (80 0 μg·kg-1)种衣剂对薯片上晚疫病菌的控制作用很强 ,持效期至少 1个月以上。但室内试验证明利用种衣剂处理薯片 ,并不能控制苗期晚疫病菌对马铃薯叶片的侵染
In order to develop the seed coating agent for controlling late blight of potato, the toxicity of four kinds of systemic fungicides to Phytophthora infestans was determined by colony diameter method and their effects on emergence of potato were tested. The results showed that vancomycin and metalaxyl had the strongest virulence against Phytophthora infestans, with EC50s of 1.5 5 μg · mL-1 and 1.6 3 μg · mL-1, respectively. The toxicity of propamocarb to Phytophthora infestans The second was EC50, which was 5.43μg · mL-1. Phosphorus-aluminum had the poorest toxicity to Phytophthora infestans with EC50 of 246.58μg · mL-1. However, metafenastam and propamocarb were selected as active ingredients for the control of potato late-onset seed dressing because exocarpine significantly affected the emergence rate of potato. Inoculation of potato chips inoculation experiments showed that high concentration (80 0 μg · kg-1) of seed coating on Phytontheroptesna Phytophthora strong control effect, duration of at least 1 month or more. However, indoor tests show that seed coating treatment of potato chips, and can not control the late blight Phytophthora infestans on potato leaves