In the process of crop planting, some phytotoxicity will inevitably occur. If you want to prevent and cure these phytotoxics, you need to learn to recognize them first. This article will explain how to accurately identify crop phytotoxicity and thus accurately control it.
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 slow growth and branching reduction; Bordeaux mixture can cause apples to fall and fall; watermelon is affected by ethephon, dark red and odor.
The distribution of spots caused by phytotoxicity is often irregular in the plant, and the whole field is light and heavy. The spots caused by physiological diseases are usually common, and the symptoms of the plants are also consistent. Spot-type phytotoxicity and fungal diseases are also different. The former has a large change in spot size and shape; while the latter has a disease center and the spot shape is relatively uniform.
Compared with the yellowing caused by lack of nutrients, the yellowing caused by phytotoxicity often develops into yellow leaves from yellow leaves, with more sunny days, yellowing is faster, more rainy days, and yellowing is slower. The latter is often associated with soil fertility, and the whole plot of yellow seedlings is consistent. Compared with the yellowing caused by the virus, the yellow leaves of the latter often have a greenish appearance, and the diseased plants exhibit systemic symptoms, which are mixed with healthy plants in the field.
The difference between the malformation caused by phytotoxicity and the malformation of the viral disease is that the former is common and shows local symptoms on the plant; the latter often has sporadic incidence, showing systemic symptoms, often mixed with broken green veins and wrinkles in the leaves. .
The wilting caused by phytotoxicity is compared with the wilting symptoms caused by the invasive disease. The former has no morbidity center, and most of them have a slow process, and the yellowing is followed by yellowing, and the dead plants and rhizome are not browning. The latter is mostly blocked by rhizome vascular bundles. When the sun is shining and the amount of evaporation is large, the wilting is first caused, then the green dead seedlings are lost, and the rhizome ducts often have browning.
The slow growth caused by phytotoxicity is compared with the stiffness and deficiency of physiological diseases. The former is often accompanied by symptoms of plaques or other phytotoxicity, while the latter is characterized by poor root growth and a deficiency of dysplasia. The leaves are yellow or dark green.
Infertility caused by phytotoxicity is different from infertility caused by climatic factors. The former is a whole plant infertility, sometimes it is partially strong, but mixed with other phytotoxicity symptoms; and the climate-induced infertility has no other symptoms, and rarely occurs. Infertility phenomenon.
The defoliation, falling flowers, fruit drop caused by phytotoxicity are different from the defoliation, falling flowers and fruit falling caused by the atmosphere or cultivation factors. The former is often accompanied by other phytotoxicity symptoms, such as yellowing, dry coke, and then defoliation. The latter is often associated with severe weather and often occurs during high winds, heavy rains, and high temperatures. The cultivation factors are mainly caused by lack of fertilizer or excessive growth, which causes falling flowers and falling fruits.
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