What about tomato leaf abnormality? In the process of planting tomatoes, it is easy to appear white round small spots, yellow leaves fall off, leaves shrink and curl, leaves brown dead, leaves appear in a row of brown spots, etc., which requires planters Take preventive measures in a timely manner.
Leaf abnormality one: white round small spots appear on the leaves
First, the reason
The main reason is spot blotch, which is caused by the infection of tomato shell and causing white round spots on tomato leaves.
Second, the main symptoms
Water-soaked small round spots appear on the back of the newly infested tomato leaves, and then slowly extend slowly toward the back and the front, so that the edges of the leaves appear dark brown, central gray-white round spots and small spots, then slowly expand The formation of dead spots can lead to dryness of the leaves in severe cases.
Second, prevention measures
1. When planting tomato, use healthy and disease-free seeds. Soak the seeds with hot water of 52-54 degrees for half an hour before sowing, then soak them in cold water for three or four hours, then remove the water and put it in the temperature. Germination for 25 degrees.
2, using smoke sterilization measures, before the tomato planting, use sulphur powder 250g, sawdust 500g per 110 square meters of shed field, after mixing evenly, place them in different places, then close the greenhouse for one night. After the tomato was planted, 45% chlorothalonil fumigation agent was used, 3750-4500 g/h square meter, and the greenhouse was closed for smoke overnight.
3, in the early stage of the disease, you can spray 50% mixed sulfur suspending agent or 64% anti-virus WP wettable powder, you can also use 0% one copper world emulsifiable concentrate 500 times liquid, or 75% chlorothalonil WP, or 77 % can kill the wettable powder 500 ~ 600 times liquid and other drugs, spray once every 7-10 days, continuous spraying two or three times can have a good control effect.
Leaf abnormality 2: yellowing and falling off leaves
First, the reason
The yellowing and shedding of the leaves is mainly caused by leaf mold. When the leaf mold disease occurs, the leaves in the lower part of the tomato will appear grayish white mold layer, and in severe cases, the leaves will fall off.
Second, prevention measures
1. Strengthen the ventilation and moisture management, properly draw the shed and let the humidity reduce the humidity in the greenhouse.
2. Take ridges for mulching and properly control watering to prevent excessive soil and air humidity.
3, the selection of disease-resistant varieties, such as the introduction of the Netherlands, Gloria, Hongqi, Tebao, and the domestic 908 cooperation, Shenza 3, Jiafen 15, No. 11, Zhongza 12 and so on.
4, spray application: 50% polysulfur suspension 800 times solution, 60% anti-mildew 600 times solution, 60% phlegm 800 times solution, 50% Shi Baogong 1500 ~ 2 000 times solution, 47.2% imazalil 2 500 to 3,000 times of emulsifiable concentrate. It is necessary to spray the front and back sides of the blade and the petiole evenly, spraying once every 7-8 days, and spraying two or three times continuously can have a good control effect.
Leaf abnormality three: the blade appears to shrink and curl
First, the reason
It belongs to a kind of hormone poisoning and is a physiological disease.
Second, prevention measures
1. Control the dose and reasonably control the amount of auxin or chlormequat.
2, scientific fertilization, at the same time can be combined with the application of biological fertilizer or humic acid fertilizer, such as Jin Mantian, Fei Tiansheng, dry land dragon, etc., to promote root growth.
3, spraying the agent, spraying Yunda 120, Haili, and shellfish on the leaf surface at the beginning of the disease.
Leaf abnormality four: the leaves appear brown, withered
First, the reason
It belongs to blight, and the pathogen is a fungus of the genus Fusarium genus, which is mainly transmitted by irrigation or rainwater.
Second, prevention measures
1. Strengthen field management, do a good job of trenching and drainage; timely remove old leaves from sickness and increase phosphorus and potassium fertilizer.
2. After harvesting the tomatoes, the sickness is also concentrated and burned, and a 1:1:200 Bordeaux mixture is applied for prevention.
3, rotation for replacement, and vegetables or other crops other than this crop for more than 3 years of rotation, can effectively prevent the occurrence of tomato wilt.
4, chemical control, spraying the syrup at the beginning of the disease for root irrigation, optional agents have 50% root disease clear 500 ~ 600 times liquid, 36% thiophanate or 50% carbendazim WP 600 times, 20 400% to 500 times solution of methyl chloric acid emulsifiable concentrate, 700 times solution of 32% fungal emulsifiable concentrate, 40% special effect sterilization king 2 000 ～ 2 500 times liquid, 20% one copper world 1 000 times liquid, etc., spray watering in the shed The liquid medicine is 9.00~11.25 t/hm2, generally 200-250g per plant watering, spraying once every 7-10 days, continuous spraying two or three times can have a good control effect.
Leaf abnormality five: the leaves appear in a scaly arrangement of brown large spots
First, the reason
It belongs to tomato brown spot disease, which is caused by the infection of the genus Aspergillus niger. It belongs to the semi-mycorrhizal fungal disease, and the pathogen is transmitted by airflow and irrigation water.
Second, prevention measures
1. In the early stage of the disease, spray 50% more moldy 1 000 times solution, 40% prochloraz 1 000 times solution, 36% thiophanate 500 times solution, 70% methyl thiophanate 800 times solution, 70% Mancozeb 600 times solution, 80% Xinwansheng 600 times solution, 40% polysulfur suspension 600 times solution, 40% more Fengnong 400 times solution, 72% gram dew 600 times solution, etc., every 7 Spraying once in 10 days, continuous spraying two or three times can effectively prevent tomato brown spot disease.
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