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The occurrence of phytotoxicity caused by improper use of pesticides occurs frequently. The affected plants often have symptoms such as spots, yellowing, deformity, withering, growth stagnation, infertility, shedding, and inferior fruit. For example, if the herbicide is sprayed improperly in the early stage of rice field, irregular brown spots will occur in the rice leaves; when the corn is damaged by metformin, the leaves will grow upside down; the glyphosate in the rice seedling stage can cause the plants to cause Dead yellow dead seedlings; rapeseed using green mellon improperly, showing growth retardation, branching reduction; Bordeaux mixture can cause apples to fall and fall; watermelon is affected by ethephon, dark red, odor and so on.
1. The difference between spotted phytotoxicity and physiological disease
The distribution of spotted phytotoxicity on plants is often irregular, and the whole field is also light and heavy. Physiological diseases usually occur, and the symptoms of plants appear 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 a disease center and the spot shape is relatively uniform.
2. The difference between yellowing type phytotoxicity and deficiency yellowing
The yellowing caused by phytotoxicity often develops into dead leaves from yellow leaves, with plenty of sunny weather and rapid yellowing; lack of yellowing of nutrients, more rainy days, slower yellowing, and yellowing often with soil fertility and fertilization The level is related and the performance is consistent in the whole field. Compared with the yellowing caused by the virus, the yellow leaves of the latter often have broken green and strong performance, and the diseased plants show systemic diseases, and the diseased plants are mixed with healthy plants.
3. The difference between malformed phytotoxicity and viral disease deformity
Malformations caused by phytotoxicity are common, and local symptoms are manifested on plants; malformations caused by viral diseases are often sporadic, often accompanied by symptoms such as broken green, clear veins, and wrinkled leaves.
4. The difference between phytotoxicity wilt and invasive disease wilt
The wilting caused by phytotoxicity has no morbidity center, and most of them have a slow process, first yellowing, post-dead strain, no browning of roots and stems; the wilting caused by invasive diseases is mostly obstruction of tissue obstruction, in sunny, evaporation When it is big, it will first wilting, and then it will lose its green and dead plants. The root catheter often has browning.
5. The difference between the slowness of phytotoxicity and the stiffness and deficiency of physiological diseases
The stagnation caused by phytotoxicity is often accompanied by symptoms of plaques or other phytotoxicity, while the physiological toxicosis is characterized by poor root growth, and the dysfunction of the deficiency is yellow or dark green.
1. The difference between spotted phytotoxicity and physiological disease
The distribution of spotted phytotoxicity on plants is often irregular, and the whole field is also light and heavy. Physiological diseases usually occur, and the symptoms of plants appear 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 a disease center and the spot shape is relatively uniform.
2. The difference between yellowing type phytotoxicity and deficiency yellowing
The yellowing caused by phytotoxicity often develops into dead leaves from yellow leaves, with plenty of sunny weather and rapid yellowing; lack of yellowing of nutrients, more rainy days, slower yellowing, and yellowing often with soil fertility and fertilization The level is related and the performance is consistent in the whole field. Compared with the yellowing caused by the virus, the yellow leaves of the latter often have broken green and strong performance, and the diseased plants show systemic diseases, and the diseased plants are mixed with healthy plants.
3. The difference between malformed phytotoxicity and viral disease deformity
Malformations caused by phytotoxicity are common, and local symptoms are manifested on plants; malformations caused by viral diseases are often sporadic, often accompanied by symptoms such as broken green, clear veins, and wrinkled leaves.
4. The difference between phytotoxicity wilt and invasive disease wilt
The wilting caused by phytotoxicity has no morbidity center, and most of them have a slow process, first yellowing, post-dead strain, no browning of roots and stems; the wilting caused by invasive diseases is mostly obstruction of tissue obstruction, in sunny, evaporation When it is big, it will first wilting, and then it will lose its green and dead plants. The root catheter often has browning.
5. The difference between the slowness of phytotoxicity and the stiffness and deficiency of physiological diseases
The stagnation caused by phytotoxicity is often accompanied by symptoms of plaques or other phytotoxicity, while the physiological toxicosis is characterized by poor root growth, and the dysfunction of the deficiency is yellow or dark green.
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