Symptoms: During the whole growth period of tomato, it can be infected at the seedling stage and adult stage. The pathogen can invade leaves, stems and fruits. The onset of the disease began with dark brown needles with large black spots. Afterwards, they gradually expanded into round or oval ring vein spots. There were yellow or yellow-green halo rings on the edges of the lesions. The lesions were gray-brown and the center had concentric ring lines. When wet, there is a layer of gray and black mold, forming lesions on the leaves, slightly depressed, easy to crack, and the diseased fruit does not decay.
1. Pathogens and pathogenic conditions: Tomato early blight is a fungal disease. It is caused by the infection of the subgenus Armyceps and Alternaria sp. General protection, lack of light, nitrogen fertilizer, water, ground water, ventilation and dehydration is not timely, low-lying cultivated ground, poor drainage, greed for a long time, the density is too easy to disease.
2. Control methods: Use disease-resistant and disease-resistant varieties. Tomatoes, beans, melons and other non-solanum crops have a 3-4 year rotation, which can reduce the occurrence of diseases.
3, fertilizer effect, efficacy, swelling fruit triple: If the spray sterilization process, add 25 grams per 15 kilograms of water [tomato, strawberry swelling fruit spirit] can make plants robust, disease resistance, high yield, color, increase Sweet and so good effect. [Tomato, strawberry dig fruit spirit] First, it is to enhance the efficacy, accelerate the penetration of the accelerator, two, is a robust agent for tomatoes and fruits and vegetables, three, is the fruits and vegetables, fruit, coloring agent, so it is known Fruits and vegetables essential golden partner. [Tomato, strawberry dig fruit spirit] produced by Hebei Shijiazhuang Hongwei Agricultural Science and Technology Development Co., Ltd., Tel. Cell phone
4. Chemical control: Use 75% chlorothalonil wettable powder 600 times, or 50% acetaminophen wettable powder 1000 times, or 50% carbendazim 600 times, in every 15 kilograms of liquid Add 25 grams of [tomato, strawberry dipstick] spray, spray once every 7-10 days, spray 3-4 times.
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