Plant growth regulators are also called hormone pesticides. Plant growth regulators can enhance crop resistance, increase crop yield, improve product quality, and improve planting benefits. Abuse of plant growth regulators can easily cause crop damage, affect yield and quality, and increase production costs.
8 symptoms of plant growth regulator damage caused by improper use
1. Symptoms of paclobutrazol damage
Plants are short, tubers are small, deformed, leaves are curled, dumb flowers, old leaves at the base fall off prematurely, young leaves are twisted and wrinkled, etc.
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2. Symptoms of Ethephon damage
Lighter damage is manifested by wilting at the top of the plant, the leaves and flowers and young fruits at the bottom of the plant gradually turn yellow and fall off, and the residual fruits mature prematurely. Severe damage is that the leaves of the whole plant turn yellow quickly and fall off, and the fruits mature and fall off quickly, leading to the death of the whole plant. Ethephon can cause phytotoxicity if the dosage is too large or the time of use is inappropriate. Ethephon phytotoxicity does not affect the next crop.
3. Symptoms of α-naphthyl acetate phytotoxicity
Mild naphthyl acetate phytotoxicity is manifested by the loss of flowers and young fruits, which has little effect on plant growth. Severe phytotoxicity is leaf shrinkage, petiole flipping, leaf shedding, and rapid ripening and shedding of fruits. For seed soaking phytotoxicity, it can cause fewer roots and deformed roots at the mildest, and no roots and seedlings at the severest; some α-naphthyl acetate phytotoxicity will cause phytotoxicity to the next crop, but most of them will not cause harm to the next crop.
4. Symptoms of triacontanol phytotoxicity
When triacontanol is used in large quantities or has low purity, it will cause sheath bending and root deformity in the seedling stage, and curling of young leaves in mature plants.
5. Symptoms of DA-6 (Diethyl Aminoethyl Hexanote) phytotoxicity
The leaves have spots, which then gradually expand, and the light yellow gradually changes to dark brown, and finally becomes transparent. Phytotoxicity has only occurred on peach trees, and no phytotoxicity has occurred on other crops so far.
6. Symptoms of Mepiquat chloride phytotoxicity
Leaves become smaller and thicker, internodes are dense, buds grow in clusters, and plants grow unevenly, causing a large number of buds and bolls to fall off, and cotton grows green and matures late. Mepiquat chloride causes fewer key injuries on gramineous plants, and the dosage range is wide. Mepiquat chloride phytotoxicity generally does not cause phytotoxicity to the next crop.
7. Symptoms of chlormequat chloride phytotoxicity
Plants are severely dwarfed, fruit branches cannot stretch, leaves are deformed, chicken claw leaves appear, buds grow in clusters, fruit branches have short internodes, and plant branches and leaves are brittle and easy to break. Seed soaking phytotoxicity, root bending, young leaves are seriously not growing, seedling emergence is delayed for 7 days, and seedlings are twisted and deformed after emergence. Chlormequat chloride is easy to cause key injuries to dicotyledons, but not to monocotyledons.
8. Symptoms of 2,4-D injury
Symptoms of mild injury include soft and bent petioles, drooping leaves, curling of top heart leaves, deformed leaves, deformed fruits, hollow fruits, cracked fruits, etc. Severe injury includes drooping of most leaves, severe curling of heart leaves, deformed and shrunk growth points, atrophy and necrosis of plant growth points, and gradual wilt and death of the whole plant. Therefore, if 2,4D is used improperly, it will kill plants like herbicides. The main problem is that it is more harmful to dicotyledons and less harmful to monocotyledons.
When using regulators, pay attention to the following points
1. Do not change the method of use or reuse it arbitrarily
Randomly increase the dosage or concentration of plant growth regulators. This will not only fail to promote plant growth, but will inhibit its growth. Therefore, apply it at the appropriate time according to the concentration and interval specified.
2. Do not prepare blindly
Before using plant growth regulators, read the instructions carefully and do not use them directly with water. Since some regulators cannot be directly dissolved in water, if they are not prepared into a "mother solution" in advance and then prepared into the required concentration, it is difficult to mix the agent at one time, which will also affect the use effect.
3. Do not use drugs instead of fertilizers
Plant growth regulators must be used under sufficient water and fertilizer conditions to play a significant role. If they are used as fertilizers, the hope of promoting crop growth is placed on plant growth regulators, and conventional techniques such as fertilization, irrigation, intertillage, and loosening the soil are not used, which will eventually affect the use effect of plant growth regulators.
4. Do not mix with other agricultural substances at will
Whether plant growth regulators can be mixed with other substances such as fertilizers and pesticides, do not mix them with fertilizers, insecticides, fungicides, etc. at will for the sake of saving trouble. It must be determined after carefully reading the instructions and undergoing tests.
5. Do not apply to seed fields
Plant growth regulators such as ethephon and gibberellin are used in vegetables, cotton, wheat and other crops for breeding and seed retention, which will cause an increase in sterile ears and a serious reduction in seed germination rate. Therefore, regulators are used with caution in seed-retaining crops.
