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(1) The aging of the leaves. At the present time, the large-scale roots of L. esculenta have serious lignification of roots and fewer new hairy roots, resulting in decreased root absorption capacity, weak plant growth, excessive fruit retention by farmers, and insufficient supply of water and fertilizers, and use of high concentrations of pesticides for disease prevention and control. Liquid, etc., thus exacerbating the yellowing of the leaves. Most of the foaming phenomenon mentioned by farmers was due to hormonal intoxication caused by drops of hormonal drugs on the leaves at the time of flowering, rather than caused by disease or deficiency.
In response to this situation, the reporter suggested that from the perspective of raising the roots and protecting the leaves, take measures to enhance plant growth and prevent premature aging. First, the mulching film was lifted to loosen the soil between the roots and increase the air permeability of the soil. At the same time, it stimulated the germination of new roots and improved the root absorption capacity. Secondly, attention should be paid to enhancing the supply of fertilizers and water, flushing all-water-soluble fertilizers such as Fangrun and lighthouses. Must not be because of low food prices to relax the management of greenhouses, so that the plants are in a state of “starvation†all day, which is even more detrimental to the normal growth of plants, resulting in decreased resistance to stress, accelerated aging of leaves, and multiple diseases. Finally, the foliar spray of 6,000 times more love to add amino acid foliar fertilizer, on the one hand to relieve the phytotoxicity caused by hormonal poisoning, on the other hand, timely nutrition, delaying leaf senescence.
(2) caused by leaf mold. Master Li of the new village of Heguan Town, Qingzhou City, Shandong Province, told reporters that the lower middle leaves of his round shed inside the shed had no visible yellow spots on the edges, and some of the yellow spots formed bulges on the leaves, showing a bubble-like shape and the back of the leaves. When the humidity is high, there is a gray green mold layer, and the disease condition develops rapidly from the bottom up, resulting in serious defoliation. According to the symptoms described by Master Li, the reporter determined that it was eggplant leaf mold. Under normal circumstances, the nighttime temperature in the shed is too high, and the relative air humidity is too high (higher than 90%), which is conducive to the occurrence and development of the disease.
The prevention and control of eggplant leaf mold disease, the focus is to control the temperature and humidity, increase light, to avoid high moisture environment within the shed. Strengthen water management, change the watering in the morning, immediately after watering, remove moisture, try to make the foliage no condensation or shorten the condensation time. At the beginning of the disease, it is recommended to spray 47% Garethon WP 800 times, or Amibo 1000 times, or 40% fluorosiliconazole 7000 times + 2% kasugamycin 600 times. +70% thiophanate-methyl 1000-fold solution (this prescription can not be mixed with foliar fertilizer, insecticide) for prevention and treatment. When the disease is prevented, kasugamycin can be sprayed at the seedling stage, and Shigao or fluconazole can be sprayed at the adult stage.
(3) caused by bacterial scab. "The eggplant at the front of the shed had a strange disease. There were chlorotic yellow spots on the bottom leaves. The spots on the front of the leaves were raised like bubbles. There were also bubbles on the fruit surface, just like the goose bumps. What is the situation?†Master Dong of Wenjia Street in Shouguang City reported to reporters on the phone. The reporter's initial judgment may be phytotoxicity, because the residue of drug residues is similar to the above, but the phytotoxicity generally forms spots or plaques that are slightly concave, instead of the “bubbles†raised by Dong’s master. The reporter learned after consulting this newspaper expert that it is likely to be caused by bacterial scab.
After the weather warms, the temperature and humidity in the front face of the greenhouse are large, which is conducive to the occurrence and spread of bacterial diseases. Therefore, we should strengthen the management of greenhouses, release air in a timely manner, and release air to prevent the disease from occurring. It is recommended that the vegetable farmers spray 72% of the agricultural streptomycin sulfate or neophytin 4000 times, or 50% of the copper carboxylate (DT) wettable powder 400-500 times the liquid for prevention and treatment.
(4) due to worms. The leaves that have been attacked by locusts are gray or yellowish brown on the back, and the leaves are blistering and the edges of the leaves curl downward. Affected buds and flowers, those who are severely unable to flower and bear fruit, are severely afflicted with wood plugs, and are easily cracked at the end of the fruit period. The reporter learned from interviews in rural areas that this year’s locusts are harming. Regardless of whether they are peppers, eggplants, or thorny cucumbers, the leaves of the plant from top to bottom are “occupied†by the red-and-white spiders and the tea plant, and the nymphs and eggs are The back of the leaf forms a dense piece, and the spraying does not work. Some vegetable growers can't just pull the garden out early.
For the effective prevention and control of locusts, this newspaper has made detailed introductions in the first two periods, and farmers can refer to them. As a reminder, when the chemical is controlled, it must pay attention to spraying the entire canopy and changing the medication so as to avoid pest resistance. At present, conventional acaricidal agents such as avermectin, tetracycline, and bufalin have little effect on killing fleas. It is recommended that agricultural farmers choose ethidium bromide, bromine oxime esters, spirooxime esters and other agents to control.
Round eggplant leaves yellow blisters
Recently, reporters interviewed many farmers in the town of Gukou, Qingzhou City, Shandong Province. The lower leaves of the eggplant were yellow and accompanied by blistering. The late leaves were severe. I wonder why. A lot of bactericidal drugs were sprayed but there was no effect. The output of eggplant was not as good as one day. The vegetable growers were extremely anxious. After investigation, the reporter believes that the causes of the above symptoms are mainly the following: