Diseases of crop diseases and external diseases are very similar. Therefore, many farmers' friends are very difficult to distinguish clearly. If we can't distinguish crops harms and diseases cleverly and use pesticides indiscriminately, the consequences are very serious. Let's follow Xiaobian together to understand It. 1. Differences between spot-type and physiological diseases Spot-type phytotoxicity is often irregularly distributed on plants, and light and heavy on all fields. Physiological diseases are generally common, and the sites where the symptoms occur are more consistent. Spot-type phytotoxicity and fungal phytotoxicity are also different. The former has a large change in spot size and shape; the latter has an onset center and the spot shape is relatively uniform. 2, the difference between yellowing type phytotoxicity and deficiency-deficiency yellowing disease Yellowing caused by phytotoxicity is often developed from the yellow leaves into dead leaves, sunny weather, yellow, rapid production; lack of nutrients appear yellow, rain Over days, yellowing occurs slowly, and yellowing is often associated with soil fertility and fertilization levels, and is consistent with yellow seedlings throughout the field. Compared with the virus-induced yellowing, the yellow leaves of the latter are often shredded green and strong, and the diseased plants show a systemic pathology, and the diseased plants are mixed with healthy plants. 3, the difference between malformation-type phytotoxicity and virus disease malformation The occurrence of malformation caused by phytotoxicity is universal, local symptoms appear on the plants; malformations caused by viral diseases are often sporadic, often mixed with broken green, bright veins, and wrinkles in the leaves. Leaves and other symptoms. 4. Difference between wilting and infestation diseases Wilt disease Wilts caused by phytotoxicity have no disease center, and most of them have a slow process, first yellowing, rear dead plants, roots and stems without browning, and infestation diseases. Most of the withered stems are obstructed by dredge tissue. When sunlight is sufficient and the amount of evaporation is large, wilting occurs first. After that, the dead plants are dying green. The root canal is often browned. 5, the difference between the delay of drug injury and the physiological disease of the stiff and lack of disease symptoms caused by drug injury is often accompanied by drug spots or other symptoms of drug damage, and physiological poisoning, hair stiffness manifested as poor root growth, lack of Symptoms of stiffness appear as yellow or dark green leaves.
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