When farmers use pesticides, pesticides often appear if the pesticides are not properly formulated and the concentrations are too high, such as repeated spraying. Symptoms of phytotoxicity sometimes resemble the symptoms of infestation. So, how to correctly identify phytotoxicity?
Phytotoxicity diagnosis
1. The emergence of abnormal seedlings in the field within a few days after application, such as dry leaves, spots, curling of heart leaves, falling flowers, fruit drop, etc.
2. After seeding, the seedlings are incomplete or rotten. After the planting, the root system does not go down or new roots, and the seedlings on the ground do not grow. The occurrence of these conditions requires the investigation of the application of pesticides in the Shangyu. As mentioned above, the use of paclobutrazol and herbicides, and the cultivation of vegetables such as tomatoes in the next crop, may cause dwarfing of the plants. The use of simazine herbicides in corn fields often causes phytotoxicity to crops such as sorghum and beans.
3. The symptoms are manifested in the entire shed. The onset rate is fast. There is no disease center and pathogenesis. The symptoms of the injury are not typical. For example, the spots are irregular, the sizes are different, and there are no mildew layers, round veins, and yellow halos.
Remedy
Observe field conditions after spraying. If symptoms occur immediately after the application of various pesticides, spraying a short time and appearing symptoms of drug injury should immediately spray a lot of fresh water 3-4 times. Strengthen fertilizer and water management, cultivating loose soil to promote the growth of roots, can also be followed by a small amount of nitrogen fertilizer to promote the growth of new leaves, timely flushing with nutrient content of comprehensive quick-effect fertilizer. Spraying growth regulators, foliar fertilizers, etc. The phytotoxicity caused by soil residues can be relieved by irrigation, and serious replanting or replanting of other crops.
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