Rotten cellar of potato (Phytophthora)
There are dark or purple spots on the surface of symptomatic potato pieces, which are deep within the 1cm, and it is not easy to see white mold, but when the humidity in the cellar is high, the disease will produce white mold, that is, pathogen cyst peduncles and sporangia. Causing a rotten cellar.
See potato disease-potato late blight for pathogen, route of transmission and disease conditions.
For control methods, see potato dry rot.
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"two Micro and one Free" cultivation techniques of Potato
"two micro and one free" means that seed potatoes use 20-25 grams of potato pieces, which are covered with microfilm after sowing, and the land is no-tillage or no-deep tillage. The application effect of this technique on the gentle slope of red soil hilly land is the most remarkable, which can be more than 15 days earlier than the potato cultivated in the same period, save fertilizer by 30%, save labor by 2-3, save cost by more than 40%, increase the yield by 150-300%, increase the rate of large potato by 30-40%, and increase efficiency by more than 700 yuan per mu. First, select improved varieties. Early and middle maturing varieties with high quality, high yield and strong resistance should be selected, especially virus-free varieties.
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Cultivation techniques of Green Potato
On the basis of traditional potato cultivation techniques, the cultivation technology of green pollution-free and high-quality potato is a cultivation technique by applying more organic fertilizer and less chemical fertilizer, selecting varieties with strong disease resistance and high quality, and using physical means to kill insects and sterilize. The specific points are as follows: 1. Turn the soil deeply in time to kill insects and sterilize. After the summer grain crops such as peas and wheat are harvested, turn the soil deeply in time and make use of the characteristics of high sunshine intensity in 3 dog days to kill underground pests such as grubs in the soil and kill the low temperature tolerant bacteria in the soil for the following year.
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