Different plant growth regulators have different symptoms when they are harmed. Experts teach you to distinguish the symptoms of the following common plant growth regulators:

1. Toxic symptoms of paclobutrazol: short plant, small root tubers, deformity, curly leaves, dumb flowers, early shedding of old leaves at the base, twisting and shrinking of young leaves. For cotton, the plant is seriously stunted, the fruit branches cannot extend, the leaves are deformed, the buds are clumped, and the buds fall. Peanut leaves are small, the plant does not grow, the peanut fruit is small, and premature aging occurs. As the efficacy of paclobutrazol lasts a long time, it will also cause drug damage to the next crop, resulting in no emergence, late emergence, low emergence rate, seedling deformity and other drug damage symptoms.

2. Symptoms of chloramphenicol poisoning: the leaves become smaller and thicker, the internodes are dense, the vegetative buds are clustered, and the plant growth is uneven, resulting in a large number of buds and bolls falling off, resulting in late green and late maturity of cotton. There are few key points in the use of acetaminophen on gramineous plants, and the dosage range is wide. Generally, the damage caused by chlorphenamine will not cause damage to the next crop.

3. Symptoms of compound nitrophenol sodium poisoning: the symptoms of mild poisoning are inhibition of plant growth and poor development of young fruit; The severe drug damage is plant wilting, yellowing and death. The damage caused by sodium nitrophenolate is less frequent, mainly on sensitive crops such as peach trees and watermelon, resulting in crop flower drop, fruit drop, hollow fruit and other phenomena.

4. Symptoms of ethephon: the top of the plant wilts, the leaves, flowers and young fruits at the lower part of the plant gradually turn yellow and fall off, and the residual fruits mature in advance. The serious drug damage is that the whole plant leaves turn yellow and fall off rapidly, and the fruit ripens and falls off rapidly, leading to the death of the whole plant. According to China Pesticide Network, excessive use of ethylene or improper use of time can cause drug damage. The damage of ethephon will not affect the next crop.

5. Symptoms of a-naphthylacetic acid toxicity: the mild naphthylacetic acid toxicity is characterized by defoliation of flowers and young fruits, which has little impact on plant growth. The more serious drug damage is leaf atrophy, petiole overturning, leaf falling off, and fruit rapidly maturing and falling off. As for the damage caused by soaking seeds, the light will lead to fewer roots and deformed roots, and the heavy will lead to no rooting and seedling emergence. A-Naphthylacetic acid will cause harm to the next crop, but most of them will not cause harm to the next crop.

6. Symptoms of DA-6 (amine fresh fat) drug damage: the leaves have spots, and then gradually expand, with light yellow gradually turning to dark brown, and then transparent. DA-6 (amine fresh fat) has only been damaged on peach trees, and no drug damage has occurred on other crops so far.

7. Symptoms of triacontanol poisoning: when triacontanol is used in a large amount or with a low purity, it will cause the sheath to bend at the seedling stage, the root to be deformed, and the adult plant will cause the young leaves to curl.

8. Symptoms of brassinolide poisoning: plants grow wildly, fruits are few and small, and rigid fruits are formed in the later stage.

9. Symptoms of gibberellin poisoning: the fruit is stiff and cracked, the fruit tastes astringent, and the plant is green and late maturing.

10. Symptoms of chlormequat poisoning: the plant is seriously stunted, the fruit branches can not extend, the leaves are deformed, there are chicken feet leaves, vegetative buds are clustered, the fruit branch nodes are too short, the plant branches and leaves are brittle and easy to break. The roots are bent and the young leaves are seriously not long after soaking, and the emergence is delayed for 7 days, and the seedlings are distorted after emergence. The chlormequat is easy to produce critical effects on dicotyledonous plants, but not on monocotyledonous plants. Generally, chlormequat does not affect the next crop.

11. 2. Symptoms of 4-D drug damage: symptoms of mild drug damage include softening and bending of petiole, drooping of leaves, curling of top heart leaves, leaf deformity, fruit deformity, hollow fruit formation and fruit cracking. The severe drug damage is that most of the leaves of the plant droop, the heart leaves curl seriously, deformity and contraction occur, the growth points of the plant shrink and necrosis, and the whole plant withers and dies gradually. Therefore, the improper use of 2 and 4D will kill plants like herbicides. The main key is that the damage to dicotyledonous plants is heavier and the damage to monocotyledonous plants is lighter.

The above are the symptoms of common plant growth regulators causing drug damage. Find and remedy the drug damage in time to avoid causing economic losses. (China Pesticide Network)