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以日本大和长芋为试验材料,采用田间定位试验方法,研究了药剂处理对重茬山药病害的防治效果。结果表明:随着山药重茬年限的增加,山药根结线虫病、炭疽病和褐斑病的病情指数逐年提高,商品率逐年下降,采用药剂处理可提高重茬山药对三大病害的防效,降低病情指数,提高山药品质。最佳药剂处理为:70%甲基托布津500倍液浸种10 min,播种后每666.7m2撒施强力生根剂8 kg,喷施30%恶霉灵0.4 kg,再用0.3%苦参碱水溶液2 L灌根。
Taking Japan’s Yamato line as test material, field experiment was conducted to study the effect of pesticide treatment on the prevention and cure of repeated cropping yam disease. The results showed that the disease index of Yam knot nematode, Anthracnose and Brown leaf spot increased year by year with the increase of years of Yam re-cropping, and the commercial rate decreased year by year. Disease index, improve yam quality. The best treatment was 70% thiophanate-methyl 500 times soaking for 10 min, after sowing 666.7m2 sowing strong rooting agent 8 kg, spraying 30% hymexazol 0.4 kg, then 0.3% matrine aqueous solution 2 L irrigation root.