Control Methods for Potato Late Blight in Winter-Grown Potatoes
What harm does potato late blight cause? How do you control potato late blight in winter-grown potatoes? Is there any netizen who knows about this and can help explain? Zhongdiwang has compiled the harm and control methods of potato late blight. The following is listed for netizens' reference. Harm of potato late blight: Water-soaked lesions appear on potato leaves...
What harm does potato late blight cause? How do you control potato late blight in winter-grown potatoes? Is there any netizen who knows about this and can help explain?Zhongdiwang has compiled the harm and control methods of potato late blight. The following is listed for netizens' reference.
Harm of potato late blight:
Water-soaked lesions appear on potato leaves, and within a few days the leaves will necrose, turning brown when dry and black when moist. Under dark and humid conditions, white mold-like sporangiophores can be seen on the underside of potato leaves, usually forming a pale yellow chlorotic margin around the lesions; the lesions on stems or petioles are black or brown.
The lesions on potato stems are very fragile, and the stems often break at the lesions. Under certain conditions, stems with lesions may wilt, thereby affecting potato growth, causing low yields, and in severe cases even total crop failure.
Control methods for potato late blight in winter-grown potatoes:
Method One:Potato late blight is mainly caused by bacteria carried on seed potatoes. Chemical seed soaking has a certain delaying effect on the occurrence of late blight, but it cannot control the occurrence of the disease. Spraying chemicals during the field growth period has a good effect on controlling the occurrence of late blight.
Method Two:After potato plants enter the early flowering stage and late blight-infected plants appear, immediately use 25% metalaxyl WP at 500 times dilution and other chemicals for spray control of late blight. Metalaxyl has the best effect on controlling late blight. Next, Ridomil, metalaxyl mancozeb, and metalaxyl copper all have certain control effects. It is recommended to use metalaxyl on a large scale in production to control potato late blight.
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