Resolve the symptoms of hormonal herbicides and take remedial measures in time

During the growth of crops, some of the symptoms of the disease are very similar to the symptoms of the phytotoxicity after the use of pesticides, leading to a diagnosis error. The Chinese Pesticide Network Xiaobian gives you advice, distinguishes the symptoms, and takes timely remedial measures:
These confusing symptoms are: poor environmental conditions (such as wind damage, water damage, freezing damage, high temperature, drought, etc.); pests and diseases (above the ground and underground); various deficiency factors, lack of fat, etc.; cultivation and cultivation measures. When conducting a diagnosis, it is necessary to fully understand various factors and analyze the causes in order to obtain a correct judgment. The following describes the diagnosis and remedial measures for the symptoms of hormonal herbicides.
2,4-butyl butyl ester and 2 methyl 4-chlorochloride are typical hormonal herbicides. When trace amounts (less than 0001%), they stimulate plants. At high concentrations (greater than 001%), they inhibit plant growth and make whole plants behave. Malformations, severely destroy the physiological functions of plants, and even lead to death. The leaves, petioles and stem tips of sensitive plants are curled, the base of the stem becomes thick, and the lumps are mild and rot. After the root is damaged, it becomes shorter and thicker, the root hair is deficient, and the absorption and conduction of water and nutrients are affected. In severe cases, the whole plant can be killed. For example, the use of 2,4-D butyl ester in the corn field after the seedlings is excessive or too late (appropriate for the corn 4 to 6 leaf stage) or inbred lines and some sensitive single cross varieties often cause pesticide damage, the symptoms are leaf curl , forming onion-like leaves, the tassel is difficult to extract, the stem is brittle and easy to fold, the leaves are dark green, the severe leaves turn yellow, dry and no ears. Prevention and control of perennial sedge weeds such as flat stalk grass with 2 methyl 4 chlorine and bentazon (bentazon), it is better to use the herbicide alone, safe, high yield and good economic benefit.
2,4-D-butyl ester is the most common type of drifting phytotoxicity. Due to the high vapor pressure, the first drift is 11-14%, and the volatilization drift is as high as 12-19%. When the temperature is above 15 °C, it begins to volatilize and drift. Increases with increasing temperature. Generally, broad-leaved crops are vulnerable to drifting. Sensitive plants include soybeans, beets, tobacco, potatoes, flax, cotton, broad beans, peas, alfalfa, sunflowers, grass wood rhinoceros, sweet potatoes, watermelon, cantaloupe, carrots, onions, garlic, tomatoes, and cucumbers. , fruit trees, broad-leaved forest shrubs, etc.
The pesticide network reminds everyone: To accurately distinguish the symptoms of phytotoxicity, take appropriate measures to remedy in time.

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