Now the development of agriculture has been inseparable from the use of pesticides, but if used improperly pesticides will produce injury, adverse effects, the following compiled on the small side put together several common plant growth regulator injury detailed analysis, with the view Look!
A-naphthaleneacetic acid
The phytotoxicity of mild naphthaleneacetic acid is that the flower and young fruit are defoliated, which has little effect on plant growth. The heavier phytotoxicity is that the leaves are atrophied, the petioles are turned over, the leaves are shed, and the results are rapidly matured and shed. For soaking seeds, the roots are less, the roots are deformed, and the roots are not rooted, and no seedlings are produced. The a-naphthalene acetic acid medicinal part will have phytotoxic effects on the lower crops, and most of them will not cause harm to the lower crops.
Condensamine
The leaves become smaller and thicker, the internodes are dense, the axillary buds are clustered, and the plants grow unevenly, causing the buds to fall off a lot, and the cotton is late and late. The ketamines are less harmful on grasses and have a wider range of dosages. The ketamine medicinal damage generally does not cause phytotoxicity to the squat crop.
Ethephon
The lighter phytotoxicity showed that the top of the plant appeared wilting, and the lower leaves and flowers and young fruits of the plant gradually turned yellow and fell off, and the remaining fruits matured in advance. The heavier phytotoxicity is that the whole plant leaves turn yellow and fall off quickly, and the fruit matures and falls off quickly, resulting in the death of the whole plant. According to the China Pesticide Network , medicinal damage can be caused by excessive use of ethylene or improper use of time. Ethephon damage does not affect the crops.
Sodium nitrophenolate
The symptoms of mild phytotoxicity are to inhibit plant growth and young fruit dysplasia; severe phytotoxicity is plant wilting, yellowing until death. The phytotoxicity of sodium nitrophenolate occurs less frequently, mainly in sensitive crops such as peach trees and watermelons, causing crops to fall, fruit, and hollow fruit.
Paclobutrazol
Plants are short, the tuber is small, deformed, the leaves are curled, the matte flowers, the old leaves of the base fall off in advance, the young leaves are twisted, and the wrinkles shrink. For cotton, the plant is seriously dwarfed, the fruit branches can not stretch, the leaves are deformed, the axillary buds are clustered, and the buds are falling. Peanuts have small leaves, plants do not grow, peanuts are small, and premature aging. Due to the long-term efficacy of paclobutrazol, it can also cause phytotoxicity to the lower crops, resulting in no emergence, late emergence, low emergence rate, and abnormal symptoms of seedlings.
DA-6 (amine fresh fat)
The leaves are spotted and then gradually enlarged. The pale yellow gradually turns dark brown. Finally, the DA-6 (amine fresh fat) has only been medicated on the peach trees. No other phytotoxicity has occurred on other crops.
Triacontanol
When the tridecyl alcohol is used in a large amount or the purity is not high, the sheath is bent at the seedling stage, the root is deformed, and the adult plant leaves the young leaves to curl.
Gibberellin
The fruit is stiff and cracked, the result is miso, and the plants are late and ripe.
Alizarinide
The plants are mad, the fruits are small and small, and the fruit forms a dead fruit in the later stage.
Chlormequat
The plants are seriously dwarfed, the fruit branches can not be stretched, the leaves are deformed, the chicken claw leaves appear, the axillary buds are clustered, the branches of the fruit branches are too short, and the branches and leaves of the plants are brittle and easily broken. Soaking seeds and phytotoxicity, the roots are bent, the young leaves are not long, and the emergence of seedlings is delayed after 7 days. Chlormequat is susceptible to dicotyledonous plants and is less susceptible to monocotyledonous plants. The chlormequat medicinal damage generally does not affect the squat crop.
2-4D
The symptoms of mild phytotoxicity are that the petiole becomes soft and curved, the leaves are drooping, the top heart leaves are rolled, the leaves are deformed, the fruit is deformed, and the results form hollow fruit and cracked fruit. Severe phytotoxicity is that most of the leaves of the plant sag, the heart leaves are severely rolled, deformed and contracted, the plant grows atrophied and necrotic, and the whole plant gradually wilting and dying. Therefore, when 2-4D is used improperly, the plant is killed like a herbicide. The main problem is that the damage to the dicotyledon is heavier, and the damage to the monocot is lighter.
More pesticide knowledge , please pay attention to China Pesticide Network
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