1. Yellowing and yellowing can occur in the stems and leaves of plants, with more occurrence of leaf yellowing. The main cause of yellowing is that pesticides hinder the normal photosynthesis of chlorophyll. Mild occurrences showed yellowing of leaves and severe occurrence of yellowing of the whole plant. The yellow leaves of the leaves have yellow spots on the heart and yellow spots on the base leaves. The yellowing caused by drug injury is different from the yellowing caused by lack of nutrient elements. The former often turns yellow leaves into dead leaves. It is sunny and sunny, and yellowing produces fast. Overcast and rainy days, yellowing produces slowly. The latter is often related to soil fertility, and the whole plot of yellow seedlings is consistent. Compared with the virus-induced yellowing, the yellow leaves of the latter often have a greenish appearance, and the diseased strains exhibit systemic symptoms, which are mixed in field strains and healthy strains.
2. Speckled lesions mainly occur on the leaves, sometimes also on the stem or fruit epidermis. Common brown spots, macula, spots, net spots and so on. The spot of the drug spot is different from that of the physiological disease. The distribution of the drug spot on the plant has no regularity, and the whole site is light and heavy. Lesions often occur in general, and the site where the symptoms appear is more consistent. The spots of drug spots and fungal diseases are also different, and the size and shape of the drug spots vary greatly, and the disease center and the spot shape of the spots are relatively consistent.
3. Malformation Malformation caused by phytotoxicity can occur in the stems and leaves of crops and roots. Commonly there are curled leaves, clumps, roots, malformed ears, and malformed fruits. Disease damage and virus disease deformity is different, the former occurs generally, the performance of local symptoms on the plant, the latter often occur sporadically, the performance of systemic symptoms, often in the leaves mixed with broken green veins, wrinkled leaves and other symptoms.
4. Shedding is mostly manifested in fruit trees and some dicotyledonous plants, with fallen leaves, fallen flowers, fruit drop and other symptoms. Pay attention to the defoliation, falling, fruit drop caused by the injury caused by the atmosphere or the cultivating factors of defoliation, falling, different fruit drop, the former often accompanied by other symptoms of phytotoxicity, such as the production of yellow, dry coke, and then deciduous. The latter, which is often associated with severe weather, often occurs during high winds, heavy rain, and high temperatures.
5. Growth stagnation This type of phytotoxicity inhibits the normal growth of the crop and slows the growth of the plant. Herbicide phytotoxicity generally has this phenomenon, but it is only slightly different. The delay caused by drug injury is related to the stiffness and deficiency of the physiological disease. The former is often accompanied by drug contact or other symptoms of phytotoxicity, while the latter is poisoned by stiff, poor root growth. Color yellow or dark green.
6. Infertility is a reflection of phytotoxicity caused by improper use of crops during reproductive growth. Infertility caused by drug injury and climatic factors are different from each other. The former is infertility of the whole plant, sometimes it is partly fruitful, but it is mixed with other symptoms of phytotoxicity; and climate-induced infertility has no other symptoms, and it rarely appears in full. Infertility phenomenon.
7. Blight Wilt Blight often shows the whole plant withered, mostly caused by herbicides. The wilting caused by the phytotoxicity is different from the wilt symptom caused by the infected plant. There is no disease center in the former, and most of the processes are slower, yellowing first, dead seedlings later, and no browning in the rhizome-transmitting tissue; the latter is mostly rhizome-transmitting. Blocked tissue, when the sun shines, when evaporation is large, the first wilting, after the loss of green dead seedlings, the base catheter often browning.
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