The lack of eggplant disease and its control measures
Eggplant needs to absorb a variety of nutrients in the process of growth and development. The physiological diseases caused by the lack of certain nutrients in eggplant are called deficiency syndromes or nutritional disorders.
In the case of nitrogen deficiency in eggplants, the leaf color becomes pale, the old leaves yellow, and when the eggplants are dry, the buds stop growing and turn yellow, and the heart leaves become smaller. Preventive and remedial measures: When preparing soil, apply basal fertilizer, especially high-quality farmyard manure; avoid eggplant water during the growth period of eggplant; find nitrogen deficiency, apply topdressing nitrogen fertilizer such as urea and ammonium bicarbonate or human waste, or use 0.3 % ~ 0.5% urea solution spraying.
Phosphorus-deficient eggplants lack phosphorus, the stems are slender, the fibers are well developed, the flower buds differentiate and the result period is extended, the leaves become smaller, the color becomes darker, and the veins become red. Prevention and remedial measures: Before planting, adequate calcium superphosphate or diammonium phosphate is used as base fertilizer; Phosphorus deficiency is found during the growth period, and spraying with 0.2% potassium dihydrogen phosphate solution or 0.5% superphosphate calcium leachate.
When the potassium deficiency of eggplant is deficient in potassium, the initial heart leaves become smaller, the growth is slower, and the leaf color becomes lighter; in the later period, the veins are chlorosis, yellow-white patches appear, and the leaf edge of the leaf tip becomes dry. In production, the potassium deficiency in eggplant is rare. Prevention and remedial measures: The main application is potassium and organic fertilizers. Generally, 10-15 kg of potassium sulfate or potassium chloride can be used per mu, and ditching can be applied on both sides of the plant. 0.2%-0.3% potassium dihydrogen phosphate solution can also be used. Or 10% of ash leaching liquid foliar spray.
When the eggplant lacks calcium, the plant growth is slow, the growth point is malformed, the young leaf margin is chlorotic, and the reticular veins of the leaves turn brown and show rust-like leaves. Prevention and remedial measures: watering on time, fertilization; found calcium deficiency, timely application of calcium fertilizer, 20% calcium chloride solution can be sprayed on the foliage, sprayed once every 5 days, and even spray 2 to 3 times.
Magnesium-deficient barrier eggplants lack magnesium, near the veins, especially near the main vein yellowing, leaves chlorosis, small fruit, poor development. Magnesium deficiency in eggplant is more common in production. Preventive and remedial measures: Increase the use of magnesium-containing fertilizers, such as magnesium sulfate, magnesium chloride, magnesium nitrate, magnesium oxide, potassium magnesium fertilizer, etc. These fertilizers are soluble in water and are easily absorbed and utilized; When magnesium is used, it is sprayed with 1% to 3% magnesium sulfate or 1% magnesium nitrate solution.
Iron deficiency iron deficiency in the eggplant, young leaves and new leaves were yellow-white, veins left green. Iron deficiency often occurs in soils that are acidic, fertile, and humid. Preventive and remedial measures: When eggplants are growing or when iron deficiency is found, they are sprayed with 0.5% to 1% ferrous sulfate solution.
Deficiency of Boron Deficiency When eggplant is deficient in boron, the top leaves are yellow and wither, the top stems and petioles are broken, the interiors are darkened, and the stems have cracks in the form of cork. Remedial measures: Boron deficiency was found and sprayed with 0.05% to 0.2% borax or boric acid solution in time.
Manganese deficiency, lack of manganese eggplant, the new veins are yellow-green, soon turn brown, veins are still green. Preventive and remedial measures: During the growth period of eggplant, plants were found to be deficient in manganese and sprayed with 1% manganese sulfate solution.
Zinc deficiency, eggplant, zinc deficiency, the leaves are clustered, the new leaf occurs on the macula, and gradually developed to the leaf margin, resulting in whole leaf yellowing. Prevention and remedial measures: When the eggplant is growing or when zinc deficiency is found in the plant, it is sprayed with 0.1% zinc sulfate solution.
In the absence of molybdenum-impaired eggplant, mottled eggplant lacks molybdenum, and from the beginning of fruit enlargement, yellow spots occur between the veins and the leaf margin curls to the inside. Prevention and remedial measures: In the growth period of eggplant or when plants are found to be deficient in molybdenum, spray with 0.01% to 0.1% ammonium molybdate solution.
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