What s the matter with half of the eggplant s yellow leaves?

It is eggplant verticillium wilt. It is a soil-borne disease, which is caused by long-term continuous cropping and heavy cropping, and the incidence of Verticillium wilt in some greenhouses is as high as more than 60%, which has become a major obstacle in eggplant production.

Verticillium wilt rarely occurs during the seedling period and usually begins after fruit set. Diseased plants mostly develop from the bottom up or from half to the whole plant. At the beginning of the disease, the leaf edges and leaf veins are yellowed, and then gradually progress to half of the leaf or the whole leaf is yellow.

The leaves are wilted at noon on a sunny day, and can still recover in the morning and evening, and the diseased leaves turn from yellow to brown in the later stage, withering and falling off. In severe cases, the whole leaf withers and falls off, leaving only the stalk. Peel off the root or stem cortex and the vascular bundles turn brown.

Verticillium wilt is a relatively difficult disease to be prevented, and comprehensive control measures should be taken with agricultural prevention and control as the main and pharmaceutical prevention and control as the supplement.

1) Seed treatment.

Before sowing, soak the seeds with 96% 3000 times + 600 times the day up to 2116 dipping seed type liquid for 1 2 hours, and then germinate and sow seeds.

2) Agricultural control.

Disease-resistant varieties were selected, and early-maturing and low-temperature tolerant varieties had strong resistance to Verticillium wilt. It is rotated with non-solanaceae crops such as onion and garlic, and water and drought rotation can be implemented where conditions permit. Apply sufficient phosphate fertilizer and organic fertilizer at the seedling stage, increase potassium fertilizer and nitrogen fertilizer at the flowering and fruiting stage, and increase carbon dioxide gas fertilizer in the greenhouse.

Plants with serious disease should be uprooted in time.

3) Chemical control.

Before raising seedlings, 10 grams of 50% carbendazim wettable powder or 1 gram of 96% oxazim per square meter of seedbed, add fine dry soil and mix well, sprinkle on the furrow surface, and then turn into the soil and mix well, and then sow seedlings. Heavy stubble and severely diseased land can be disinfected to the soil. After planting, 3000 times of 96% dimetallin, or 50% carbendazim wettable powder 500 times, or 3500 7000 times of mycecarb were mixed with 1000 times of Tianda 2116 Zhuang Miao Ling to irrigate the roots, 100 ml per plant, with an interval of 7 10 days, twice in a row.

It is suspected that the wound is caused by root-knot nematode infection, which leads to the suspicion of compound infection of bacteria, Fusarium wilt, Verticillium dahlia and other soil-borne pathogens, and the root control of root-knot nematodes is controlled by using avi chlorpyrifos and thiazolphosphine root irrigation, and it is recommended to be conservative **, with methyl frost mildew, fludioxonil, copper amide, prochlorchloraz, ethyl allicin, chlorobromide isocyanuric acid, Pythium oligoandros, Bacillus subtilis and other root irrigation control.

The most common reason for eggplant yellow leaves is the lack of nutrition, the growth of eggplant with filial piety has a greater demand for nutrients, if the nutrition is insufficient in the planting process, it will lead to a variety of different symptoms of eggplant, magnesium deficiency, iron deficiency can lead to eggplant yellow grinding hidden leaves, lack of other trace elements may also cause eggplant leaves to turn yellow.

The most common reason for eggplant yellow leaves is the lack of nutrients, the growth of eggplant has a greater demand for nutrients, if the nutrition is insufficient in the planting process, it will lead to a variety of different symptoms of eggplant, magnesium deficiency, iron deficiency can lead to eggplant yellow leaves, lack of other trace elements may also cause eggplant leaves to turn yellow.

1.Fertilizer Impact:The wrong use of fertilizer leads to more ammonia gas in the place where the eggplant is planted, and when there is too much ammonia, it will affect the growth of the eggplant, which may lead to the phenomenon of ammonia poisoning and leaf yellow production of eggplant.

2.Effects of the drug:When using the agent on eggplant, it is necessary to pay attention to the concentration and use time, and it should not be used in the morning and evening, because at this time, the opening and closing degree of the eggplant stomata is small, and the efficacy will be controlled to a certain extent, and the use in the morning and evening will increase the humidity and increase the incidence of disease.

What to do with eggplant yellow leaves.

1. Watering in time:After the amount of fertilizer is large, it is necessary to water in time, wash off the excess fertilizer, control the temperature in the shed, and spray foliar fertilizer appropriately.

2. Spraying antidote:After the occurrence of pesticide damage, the antidote can be sprayed appropriately to increase the temperature of the planting place and protect the roots of the eggplant.

3. Timely nutrition supplementationWhen the eggplant is blind or the leaves turn yellow due to the lack of elements, there will be different yellow leaf phenomena, so the yellow leaves caused by the lack of elements should be supplemented according to the specific missing elements.

<> the yellow leaves of eggplant may be due to soil compaction, it is necessary to loosen the soil regularly for eggplant to improve the permeability of the soil. Long-term lack of light will also cause eggplant leaves to yellow, and it is necessary to provide full sunlight for eggplant Zen tantan dust during maintenance. Long-term lack of fertilizer can also lead to leaf yellowing, so it is necessary to apply sufficient nitrogen and potassium fertilizer to the eggplant, and do a good job of pest and disease control.

1. Soil compaction.

When the soil is severely compacted, the water permeability and air permeability are so poor that it cannot be absorbed during the application of fertilizer and water, and finally the eggplant leaves turn yellow. Therefore, the soil should be loosened regularly to maintain soil porosity, which is conducive to the growth of air permeability and respirability.

Second, the light is insufficient.

Eggplant is a light-loving vegetable that needs a lot of sunlight to grow. If there is not enough light for a long time, it will lead to leaf yellowing. Therefore, during the growth and flowering periods, it is necessary to receive strong light conditions every day to promote the growth of branches and leaves and improve the fruit setting rate.

3. Long-term lack of fertilizer.

Eggplant growth requires an appropriate amount of fertilizer, if the fertilizer is insufficient, the branches and leaves can not grow sufficiently, resulting in the occurrence of leaf yellowing. Therefore, nitrogen fertilizer is the main fertilizer during the growth period, and nitrogen and potassium fertilizer are the main fertilizer during the flowering period, and some magnesium iron elements are appropriately supplemented to avoid fertilizer damage.

Fourth, pest and disease infestation.

Eggplant often has some diseases and pests, which will cause the leaf yellow phenomenon. Therefore, during the seedling period, it can be sprayed with 65% zebsen 500 times solution or 50% carbendazim 1000 times solution, and pests can be sprayed with 1500-2000 times avermectin EC and 20% pyrethrin 2000 times.

The disease of yellowing of eggplant leaves is called "Verticillium wilt", the folk call it half madness, the transmission route is spread by fungi, which can cause all extinction, the main reason for the occurrence of eggplant Verticillium wilt in production and planting is caused by many years of heavy cropping, and it is difficult to control it with general medication. Foliar sprays such as copper humate, chunleimycin, and vicoxamine were sprayed, but the effect was not very good. In the long-term production practice, farmers have accumulated a mature and effective method to resist Verticillium wilt, which is to water the roots of eggplant with fermented and cooked manure soup, or directly into the ditch, which can greatly reduce the disease.

In addition, when arranging crop rotation, it is necessary to try to avoid heavy planting.

Too much sun, lack of water, bacteria, insects, etc. are all possible.

1. Fertilizer impact.

Fertilizer damage usually occurs on cloudy or sunny days. Farmers use a lot of undecomposed agricultural fertilizer. Improper use of fertilizers leads to large amounts of ammonia in the field. When there is too much ammonia, it can affect the growth of eggplant. If not ventilated in time, it can lead to eggplant ammonia poisoning.

2. The impact of drug hazards.

When using eggplant medicine, the type and amount of medicine should be controlled according to the problem and weather of the eggplant and the growth of the eggplant. Special attention should be paid to the use of drugs such as Shi Jiale. Although the control effect is good, it is necessary to pay attention to the concentration and the time of use, and can not be used in the morning and evening, because the stomata of the eggplant are very small in these two periods, which will inhibit the efficacy of the drug to a certain extent, and the use at night will increase the humidity and increase the incidence of diseases.

3. Lack of nutrition.

The growth of eggplant has a great demand for nutrients. When growing, the nutritional needs of eggplants should be met. If the nutrients are insufficient or some nutrients are lacking, eggplant will experience various deficiency symptoms, including magnesium deficiency and iron deficiency, which is the main cause of eggplant yellow leaves, and some other trace elements can also cause eggplant yellow leaves.

4. Related to grafting.

The actual production showed that the growth of ungrafted eggplant plants was relatively stable, the fruit color was good, the commodity rate was high, and more importantly, the eggplant seedlings had almost no yellow leaves, while the eggplant grafted by Torubam was accompanied by yellow leaves, and leaf mold occurred from time to time. This claim is unclear, so if a vegetable farmer doesn't have root-knot nematodes in the shed, they can try to produce eggplant seedlings, or graft the eggplant with thornless evergreen as rootstock, which could be unexpected for the harvest of Solu.

There are many causes that cause the leaves to turn yellow, such as the common drought and flood, fertilizer damage, pesticide damage, bacterial disease, true osmosis and guess mycosis virus disease, which affects the growth, and only the parietal leaves are yellow?

Verticillium wilt is an earth-borne disease like bacterial wilt, but there are differences between the two. There are many pathogens accumulated in the soil, and if there are wounds in the roots, the germs will take the opportunity to enter the plants, and when the temperature and humidity are right, the leaves will turn yellow and wilt. Therefore, in the plots with severe heavy stubble and poor planting quality, Verticillium wilt occurs more.

To prevent and control eggplant Verticillium wilt, it is necessary to strengthen field management and combine pesticides for prevention and control.

1. The transportation plot of eggplant planted year after year should be rotated with other vegetables. Avoid plots where tomatoes and peppers are grown, and after crop rotation, the germs will gradually die if they have no hosts. When planting eggplants in greenhouses, you can use the high temperature to stuff the shed to reduce the eggs of germs and insects in the soil.

2. In addition to crop rotation, in the process of growing, eggplant should do a good job of rooting, root protection, and root nourishment, so as to avoid wounds and germs invasion of the root system during planting, watering and fertilization. When eggplants are planted, they should not be planted at noon when the temperature is high, so as not to burn the root system due to high soil temperature. Planting should not be too deep, to bury the substrate prevail.

After planting, the roots can be irrigated with Bihu to promote root growth.

When watering, in addition to watering a lot of water after planting to promote slow seedlings, when watering between the halls at other times, try to water as little as possible to keep the soil moist. Watering during high temperature hours is also harmful to the root system. When applying Jingjing hidden fertilizer, the base fertilizer does not need to be manure, and it must be applied to the soil after it is ripe to avoid burning the roots.

3. In order to enhance the growth of plants, disease-resistant varieties can be selected, or grafted to prevent diseases. After eggplant colonization, root irrigation can be performed with carbendazim to prevent the occurrence of Verticillium wilt. After eggplant fruit setting, root irrigation can be carried out with chlorobromoisocyanuric acid, dimethyl, etc. in the early stage of the disease.

Combined with foliar spraying of some fungicides, foliar fertilizers, brassin, etc., comprehensive control.

Once the yield of eggplant Verticillium wilt occurs, the yield is more serious, especially in the perennial planting plots, when eggplants are planted in small areas in vegetable gardens, this disease also often occurs. Then in the prevention and control of Verticillium wilt, we must use a combination of agriculture and pesticides, when the leaves are yellow, you can cut the stalk to see if the vascular bundle has browned, as soon as possible.

A: Maybe it's nutritional.

Eggplant requires moderate intensity of light, and the soil maintains a humidity of about 80%. Cataplexy, standing blight, Verticillium wilt, cotton blight, brown streak, 28-star ladybug, eggplant yellow spotted borer, red spider, tea yellow mite and other diseases are likely to turn the young leaves of eggplant yellow, choose excellent varieties of control technology: ditch drainage, with foliar fertilizer:

Mixed spraying of amino acids, multi-trace elements, aqueous foliar fertilizer, brassin, and pyridhoprid can control aphids and diseases and increase their nutrition, and the young leaves of eggplant will not turn yellow. Medication per mu: 60 ml of amino acid multi-trace aqueous foliar fertilizer.

Spraying magnesium fertilizer: can be sprayed with foliar fertilizer containing magnesium, such as green Bolai calcium magnesium foliar fertilizer, or chelated magnesium, or 1 bag of Omai 1 sprayer (30 kg of water), and magnesium sulfate (that is, 1 two to 3 sprayer), etc., to supplement nutrients for crops, pay attention to spraying the lower leaves when spraying. First of all, look at whether the soil is not compacted, whether there is a serious lack of water, because, after compaction, the water permeability and air permeability are very poor, and the roots can not grow normally, and then increase the application of organic fertilizer to avoid the loss of organic matter caused by long-term use of chemical fertilizers, and check whether the scallum key is diseased.

Many people will be affected in fertilization, fertilizer damage usually occurs when it is cloudy and sunny, many people who plant have not gone through the rotting farmhouse fertilizer, resulting in a large yield of ammonia in the land, which will affect the growth of eggplant, if not ventilated in time, it will lead to the wilting and death of eggplant, lack of fertilizer yellow. It is manifested in the color of the young leaves becoming lighter, yellow or light green, and the old leaves are more normal, or gradually turning from green to yellow. Usually apply thin fertilizer frequently, and teach some alum water to supplement iron in a timely manner.

In the event of fertilizer hazards, it is necessary to water immediately, clean the fertilizer, and restore the physiological functions of the plants. You can shake the temperature in the Trol cultivation hut, spray foliar fertilizer appropriately, and add an appropriate amount of potassium dihydrogen phosphate to the foliar fertilizer. When the phenomenon of root burning occurs, after the appropriate spraying of rooting agent occurs pesticide damage, spray the antidote foliar fertilizer immediately, and spray water on the foliar surface to alleviate the pesticide damage when the residual time is early, and control the use of the pesticide according to the growth status of the plant and various factors, especially pay attention to the concentration of the pesticide.

Ying Kai should cut off these leaves Chong Sun Kaizi, if there is a yellowing situation, then it is likely that the soil moisture is not enough, in this case, it should be watered in a large area to ensure that this kind of situation will not occur.

Usually do pest control work for eggplant, regularly supplement sunlight, regularly water and fertilize, pay attention to cultivating gardens, and do a good job of deep ploughing of eggplant soil.