Question: In recent days, users have consulted on "Rain After Rain" and the vascular bundles in tomato roots and stems are discolored. What is this disease?

Dong Xin and Dong Yanbin A: According to this issue reflected by netizens, combined with the comprehensive analysis of photos distributed, the author believes that this is a typical symptom of tomato wilt disease. This disease is also called tomato half-dried and tomato wilt disease. It is an important soil-borne disease. It begins to develop in the fruiting period and it dies in the fruit period. Some have depressions on one side of the stem, causing yellowing on one side of the leaf and dead after turning brown; some half-leaf or half-leaf turn yellow, and some start from the leaf sequence close to the ground and spread upward in turn. The top leaves are in good condition and the rest are withered. When wet, the stems attached to the ground surface produced pink mold. Cut open the diseased stems, it can be seen that the vascular bundles turn brown, and there is no milky white mucous outflow from the diseased stems. This is a clear difference from the bacterial wilt disease.

The pathogen is the Fusarium oxysporum Tomato specialised, semi-mycotic fungus. The mycelia or chlamydospores are infected with the diseased body in the soil or adhere to the seed for overwintering. They live in rot and live life. They reach the fruit through the catheter through the stem from the diseased stem and then spread to the seed after the fruit rots and causes the seed to grow. With bacteria. Seeds are sown with germ-free seeds and are onset after emergence. Generally from root wounds, natural rifts, and root hairs invade the host, enter the vascular bundle to block the catheter, and produce toxic substances fumonisin. After the spread, the diseased plant leaves yellow and die, spread through the water stream or irrigation water. Soil temperature between 21 and 33°C, moderate temperature 28°C, soil moisture, continuous cropping, application of uncontaminated organic manure, improper fertilizer application, or weak root growth, weak soil growth, soil acidity, or root knot nematode damage. Both are conducive to the occurrence of the disease heavier.

Prevention:

1. Select disease-resistant varieties, implement rotation with non-sweet potato vegetables for 2 to 3 years or more, add fully fermented and decomposed organic fertilizer or organic-inorganic biological compound fertilizer containing humic acid, according to tomato growth, nitrogen, phosphorus, potassium 3.54 : The demand ratio of 0.94:3.89 is formulated to fertilize and enhance the disease resistance of plants.

2. Soil treatment: 35% Fukui WP for every square meter of seedling bed, 8 to 10 grams of fine soil, 4 to 5 kg of fine soil, or 8 to 10 grams of 80% carbendazim WP and 4 to 5 kg of fine soil. After mixing, spread one-third of the medicine to the surface and two-thirds of the medicine is used to cover the soil after sowing.

3. Seed treatment: soaking with hot water at 52°C for 30 minutes before sowing, or soaking with 0.1% copper sulphate solution for 5 minutes, washing with clean water and germination.

4. Agent spray control:

(1) 35% wither wilt (benzyl azoxystrobin) Aqueous Solution 1000 times liquid + 30% Zhongnong Rui Miaoqing (a methyl bromide f moldy spirit) liquid agent 750 times.

(2) 60% Miaokang (?f-methyl-pyrazole) 750 times liquid + 50% chlorobromoisocyanuric acid wettable powder 750 times.

(3) 85% of the world without blight (Butrazepam? F moldin) wettable powder 750 times + 20% copper rosinate EC 3000 times.

(4) "Rebirth" brand root disease dedicated 1 + 1 (powder 20 g + water agent 25 ml) 330 times.

Active Pharmaceutical Ingredients

Active Pharmaceutical Ingredients(API) refer to the raw materials used in the production of various preparations. They are the effective ingredients in the preparations. They are various powders, crystals, extracts, etc., prepared by chemical synthesis, plant extraction or biotechnology, but Substances that the patient cannot take directly. API is intended to be used in any substance or mixture of substances in the manufacture of pharmaceuticals, and when used in pharmaceuticals, it becomes an active ingredient of the pharmaceuticals. Such substances have pharmacological activity or other direct effects in the diagnosis, treatment, symptom relief, treatment or prevention of diseases, or can affect the function or structure of the body. According to its source, active pharmaceutical ingredients are divided into two categories: synthetic chemical active Pharmaceutical ingredients and natural chemical active Pharmaceutical ingredients.

Chromium Picolinate,Tianeptine,6-Paradol,Aminobutyric acid,acetylcysteine,L-Carnosine

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