Tomatoes are common vegetables in our daily life. They are delicious and nutritious, and are very popular among people. This article will introduce the prevention and control measures of tomato flower skin, and hope to help everyone grow tomatoes. This is a physiological disease, also known as tendon rot or strip rot or rot, which mainly harms the fruit. Here are some common types. There are two types. One is browning . The young fruit stage begins to occur, mainly affecting 1 to 2 ear fruits. Local browning occurs on the fruit surface during fruit enlargement, and the fruit surface is uneven. Individual fruits are brownish brown or hardened with necrotic spots. The diseased fruit can be found in the peel. The vascular bundle is brown-like strip necrosis, the heart is hardened or the flesh is browned, and the value of the commodity is lost. The second is a white variant . It mainly occurs in the period when the green ripe fruit turns red. The disease is uneven coloring of the fruit, and the light fruit shape does not change much. The heavy part near the fruit stalk has a green protrusion, the reddish part is slightly sunken, and the diseased part has wax. Glossy, the diseased fruit can be found in the fruit of the "heart" shape, the vascular tissue of the pulp is dark brown, the light part of the vascular bundle is brown and necrotic, and the browning part is not red, the hardening of the meat, poor quality, food It is light and tasteless. The fruit of the disease is heavy, the vascular bundles of the flesh are all dark brown, some of the fruits form a hollow, and the bright red and green sides are uneven. The vegetable grower speaks of a white variant. Tomato rot is generally not seen on the stems and leaves, but the stem of the stem is 70 cm away from the root. It can be seen that the stem has a brown lesion and has been destroyed, resulting in the above-mentioned symptoms of the fruit. This is related to the virus disease. different places. Cause: Because it is a physiological disease, the degree of damage depends on the variety, sunshine hours, light intensity and the proportion of nitrogen, phosphorus and potassium in the soil. Control methods: mainly in the management of work, appropriate increase in light science to determine the sowing, planting period, using formula fertilization. The above symptoms can be sprayed with multi-element fertilizer. Prevention and control technology of cucumber pests and diseases in protected areas 1, physical control (1) High temperature disinfection soil: It is carried out during the high temperature period of Sanxia. After the spring protector is pulled, the pastures are cleaned, and the sick, diseased, and diseased roots are eliminated from the field for deep burial or burning; 50-100 kg of lime per acre and 1000 kg of broken straw (or wheat straw) are applied evenly. On the surface; deep soil hoe 66 cm, super high ridge 33 cm, irrigation, so that the ditch is always filled with water; cover the mulch and sealed shed 7-10 days, can control cucumber wilt, disease, root knot nematode and so on. (2) Baking soda or high-fat membrane to prevent powdery mildew: When powdery mildew has just occurred, spray 500 times of baking soda, once every 3 days, even spray 5-6 times, both to prevent powdery mildew and to decompose carbon dioxide. Increase cucumber yield. Or use a 27% high-fat emulsion 80-100 times solution, spray once every 6 days, and spray 4 times. (3) Yellow plate lure or silver ash film to avoid cockroaches. 2, biological control (1) Disease prevention: For powdery mildew, anthracnose, black spot, when individual lesions are first formed, 2% agricultural anti-120 or agricultural anti-B0-10 water 200 times liquid can be sprayed, sprayed every 6-7 days. Second, even spray 3-4 times, but also treat gray mold, downy mildew. Bacterial diseases, such as the initial stage of keratosis, can be sprayed with 100 times liquid of 751 water-repellent agent, sprayed once every 5-6 days, and even sprayed 2-3 times. (2) Insect control: When the cucumber aphid occurs, it can be sprayed with 200 times of saponin, plus 0.01 neutral detergent, or 0.6 ml of 0.65% arsenic, plus 60-80 kg of water for spraying. Tea scutellaria can be sprayed with 20% compound Liuyangmycin 800-1000 times solution, sprayed once every 6-7 days, even spray 2-3 times. 3, chemical control For the disease has been protected cucumber, high efficiency and low prime choice of residues of pesticides, appropriate control. Downy mildew can be 7% anti-mildew dust or 80% big raw M-45 wettable powder or 72% dewable powder; gray mold with 5% anti-mold dust or 50% predator or wet powder or 50% Wanmuling 2nd 1000 times liquid; 5% anti-bacterial dust or bacteria spirit for angular spot disease; anti-black mold dust or 40% Fuxing emulsifiable oil for black spot disease; 8% grams of charcoal dust or 80% anthrax fumei for anthracnose Wettable powder; aphids and white meal can be controlled by anti-mite and anti-mite dust or 10% imidacloprid wettable powder. Nylon Wire Mesh,90 Micron Nylon Mesh,Wire Mesh Fabric Mesh,Nylon Filter Wire Mesh Xinxiang Xin Ming De Machinery Co., Ltd. , https://www.xmdsieve.com