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When planting eggplants, farmers often encounter problems with eggplant yellow leaves. So, what is the eggplant yellow leaf? What medicine should I use? In order to let farmers better understand the problem of eggplant yellow leaves, do a good job in the prevention and treatment of eggplant yellow leaf disease, Xiaobian for everyone to summarize the relevant knowledge about eggplant yellow leaves, the specific content is as follows:
Phytotoxicity: Yellow leaf in the production of eggplant in greenhouse is due to the unreasonable application of certain sensitive agents, such as continuous spraying of a large amount of pyrimethanil, shijiale, phlegm, and chlorpyrifos, and serious after 5-7 days of spraying. Will show symptoms of bad. If a long-term excessive application of a drug containing manganese-zinc-based ingredients causes yellowing of the middle and lower functional leaves (the veins remain green and the mesophyll yellow).
In this regard, it can be sprayed with Harvest No. 1 or natural alizarin lactone to relieve symptoms and restore the plant to normal as soon as possible. Therefore, in the prevention and control of pests and diseases, it is necessary to use the medicine scientifically, reasonably and cautiously. Do not blindly mix, increase the dosage or increase the number of medications. For some uncommon agents, it should be applied in large areas after a small area test.
Improper management of fertilizer and water: After planting and slowing down the seedlings, the fertilizer is prevented from being excessively controlled, which leads to the imbalance of nutrient elements in the soil around the roots of the eggplant plants, and the physiological metabolism of the plants is disordered. Therefore, the eggplant plants exhibit different degrees of yellow leaves.
Too many fruiting "falling trees": entering the fruiting period, blindly pursuing too high fruit setting rate, leading to dystrophic growth and reproductive growth ratio of eggplant plants, and the inappropriate adjustment of greenhouse temperature will aggravate the deterioration of yellow leaf phenomenon. In order to prevent "falling trees", we should strengthen the management of agriculture, cultivate strong trees, and carry out appropriate thinning and fruit thinning according to the growth of plants. Don't be tempted to influence the overall output and benefits because of the short-term large-scale fruit set.
Potassium deficiency causes yellowing of the leaves: the physiological yellow leaf symptoms caused by eggplant deficiency of potassium and the similarity of verticillium and virus disease of eggplant are easy to cause misdiagnosis, leading to mistakes in prevention and treatment measures.
Eggplant deficiency potassium and verticillium wilt and viral diseases are characterized by yellowing and shrinking of the leaves. The specific identification points are: Co.,
1 The vascular bundles of the stems, branches and petioles of the verticillium wilt are brown, and the plants are wilting; the potassium deficiency has no such symptoms.
2 The yellow leaves caused by viral diseases are generally expressed in new shoots, and purple-brown necrotic spots appear on the local stems and leaves; the potassium deficiency is yellowing and inward from the tip and leaf margin of the lower leaves of the plants, and then the leaf margins The side is dry.
3 Potassium deficiency plants are not dwarfed, and both verticillium and viral diseases have symptoms such as dwarf branches and no extension.
In this regard, it is recommended to spray the potassium dihydrogen phosphate leaf fertilizer on the foliar surface in advance, and grasp the high-potassium quick-acting fertilizer and the appropriate amount of biological fungi in the root of the eggplant at the critical stage of the fertilizer.
Yellow roots are caused by the decline of root activity: According to the investigation, the dysplasia or injury of eggplant roots directly affects the absorption and utilization of various nutrients by the plants, thus causing different degrees of yellow leaves.
(1) Yellowing of new leaves in the middle growth period - some fresh yellow spots appear on the new leaves on the top of the plant and the new leaves on the lower side branches. This happens mostly during the abundance of eggplants. Because the plants need more nutrients, the provision of nutrients absorbed by the roots is insufficient. This situation will gradually diminish or disappear over time. In this case, the foliar surface can be supplemented with iron, boron, zinc and other elements for early prevention, and the roots of the plant growth conditioning agent can be used to conserve the root system.
(2) The central functional leaves are yellowed - large plaques appear between the veins of the leaves in the middle of the plant, the shape is irregular, sometimes not too obvious, and the shape is like cotton wool. This situation is due to the lack of long-term nutrients in the plants, while the vegetable farmers only apply some fertilizers such as humic acid or less compound fertilizer, and the nutrient supply of the plants is not timely. In this regard, appropriate amount of compound fertilizer with high nitrogen and high potassium should be supplemented, 25-30 kg per acre. In addition, foliar fertilizer can also be sprayed to supplement trace elements.
(3) The lower leaves are yellow - the whole leaves are yellow, causing them to fall off in severe cases.
Causes of the disease: First, the lack of long-term nutrients, the plant grows weak; Second, the soil compaction, permeability reduces root premature aging.
First, timely supplement nutrients, and more application of root-type fertilizers such as active biological fertilizer.
The second is to timely cultivate the loose soil, carry out shallow raking, enhance soil permeability, and promote new roots. In this case, the live EM bacteria can be applied 2-3 times during watering, and the cytokinin is applied in combination with the foliar application of 800 times and 1000 times.
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