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The hazard of spotted cucumber flower spot disease occurs mostly in the middle of shed plant cucumber plants. There are shades of different shades between the early veins, and the light-colored parts of the post-florescence gradually turn yellow, the leaf surface is uneven, and the convex part is chlorotic. , white, light yellow or yellowish brown. Finally, the entire blade turns yellow, hardens, and the leaf edge curls downward. Foliar unevenness is caused by the accumulation of photosynthetic products in the leaves, while the hardening of the leaves and the sagging of the leaves are caused by the accumulation of photosynthetic products and the imbalance of growth. The sugar produced by the photosynthesis of the leaves during the day is usually transported from the leaves in the first half of the night. If the night temperature, especially in the first half of the night, is below 15 °C, the transport is blocked. In addition, low temperature, especially in the early stage of planting, is low, which will hinder the development of roots, leading to aging of the leaves and the appearance of variegated leaves. In addition, calcium and boron deficiency will also affect the normal export of carbohydrates.
Control method:
1. Strengthen the management of fertilizer and water: cultivate strong seedlings, properly control water after planting seedlings, strengthen cultivating, and increase ground temperature to promote root development. Add fertilized farmyard manure and supplement trace elements such as calcium, magnesium and boron. After entering the melon period, it is necessary to water the water in an appropriate amount and uniformly.
2, control temperature: according to the daily temperature control requirements of cucumber, in the morning to maintain 28-30 ° C, 25 ~ 30 ° C in the afternoon, in the middle of the night to stay at 15 ~ 20 ° C, and stay at around 13 ° C in the middle of the night.
3, to pick the heart at the right time, properly remove the bottom leaves, timely vines.
4. Cultivation management: When using copper-containing chemicals, do not arbitrarily increase the dosage. The interval between the pesticides should not be shorter than 15 days, and it is best to use them alternately with other pesticides.
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