The temperature and humidity are suitable in the autumn, and it is suitable for most diseases and insect pests. Therefore, attention should be paid to the management of autumn tomatoes, and various pests should be prevented and controlled. It is very important to do these tasks before going up the film. Here are some common pests and diseases for your reference. Cracked fruit Tomato cracking is a common physiological phenomenon. The main cause of cracking is water imbalance, and it is also related to the variety. Prevention of tomato cracking measures: First, the choice of species. Select crack resistant, lush foliage, thicker, and tougher varieties. The second is to maintain the proper dryness and humidity of the soil. Use mulching or rice straw covering to maintain a relatively stable soil moisture and prevent it from drying out. The third is to increase organic fertilizers, improve soil structure, and increase the ability of soil to retain water and fertility. The fourth is moderate pruning to ensure the lush foliage of plants, enhance the transpiration of excess water in the plants, and prevent direct sunlight from the fruits. Fifth, timely harvest of tomatoes before heavy rain. Sixth, in the period of fruit enlargement, 800-1000 times harvested No. 1 plants were sprayed to prevent cracking of tomatoes. Early blight After the onset of the disease, the mask of the leaf was concentric and striated, dark brown, and water stained. After the onset of stems, petioles, and fruits, concentric ring vein lesions are also present, and when wet, lesions are black moldy. Before and after the onset of disease, 70% mancozeb WP can be used as a 500-fold dilution, or 75% chlorothalonil wettable powder as a 400-fold dilution. Once every 7 days, spray 3 to 4 times. Leaf mold During the onset of the disease, the pedicel was surrounded by hard black spots, irregular yellow lesions on the leaves, and a brown layer of mildew when wet, causing the leaves to yellow, curl, and then fall off. Before and after the onset of disease, 70% mancozeb WP may be used as a 500-fold dilution, or 50% skeletal WP may be sprayed as 800-1000 dilutions, once every 7 days, and sprayed 3 to 4 times. Grey mold In the flowering stage, 0.1% of 50% fasting WP or 50% acetaminophen wettable powder can be added to the medlar liquid, which is very effective. The fruit can also be sprayed, but care should be taken to prevent the bacteria from developing drug resistance. Can also use 50% chlorothalonil dust agent, spray 300 grams per acre. Viral disease At the beginning of the disease, 20% of the virus A WP 500-fold dilution, or 800-fold dilution of the virus spirit, can be used. Once every 7 days, spray 2 or 3 times. Late blight The damaged petiole and main stem are dark brown rot and the seedlings are wilting and lodging. The lesion starts from the tip of the tip of the leaf blade. When wet, it has white moldy material. When dry, it is dry and the lesion turns from brown to dark brown, water stain or moire. , slightly sunken, hard fruit. Onset can be sprayed with 40% Phytonemide WP 300-400 dilutions once every 7 days. It can also be controlled by the dust method, that is, spray 5% chlorothalonil compound powder with a duster, spray 1 kg per acre, spray in the evening. Umbilical rot Damage tomato fruit. When the onset of disease can be applied topically 1% superphosphate, British calcium or 0.1% calcium nitrate, etc., once every 10 days, and even spray 2 or 3 times. Spot Blight When the diseased leaves were water-stained, the lesions were nearly round, and the center was grayish white with dark brown edges and slightly sunken, like fish-like, scattered black dots, easily perforated. Petiole, stem and fruit can be scattered small black spots. At the beginning of the onset, 70% mancozeb WP can be used as a 500-fold dilution, or 50% carbendazim WP can be used as a 500-fold dilution. Once every 7 days, spray 3 to 4 times. Bacterial wilt Generally from the onset of fruiting, the onset of disease, wilting at noon, return to normal in the evening, 2 to 3 days after the death, cross-cut stems can flow out of white bacteria. Can be used 25% DT wettable powder 600 times dilution spray, can also be used 200 mg / liter of agricultural streptomycin irrigation roots, 0.5 kg per plant, 7 days 1 time, irrigation 3 to 4 times. Insect pests mainly include bollworms and aphids. In the flowering period, cotton bollworm should be sprayed with pesticides such as DT insecticides, Weiyuan Biochemical's series of AWD salts and other pesticides every 5 to 7 days, and they should be changed and applied frequently. Aphids can be sprayed and killed by anti-influx, imidacloprid and other agents. Self Lock Plastic Pull Tight Seals
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