Fruit tree damage remedies

In summer and autumn, fruit trees are prone to phytotoxicity. The damage of pesticides to fruit trees is divided into acute and chronic. Acute injury is manifested within a few hours to several days after spraying, such as spots, yellowing, chlorosis, withering, leaf curling, deciduous fruiting, and tufting. Chronic drug damage will manifest itself after a long period of time, such as weakened photosynthesis, delayed flower bud formation and fruit maturation, small size, deformity, and deterioration of flavor and color. Once fruit trees are found to have been sterilized, the following measures should be taken immediately to rescue them.

1. Washing most chemicals with water is not resistant to water scouring. If the application concentration is too high and causes phytotoxicity, sprayer should be used to fill the clean water and repeatedly wash the leaves of the fruit trees to flush away the residual agent on the surface of the leaves. The earlier and more timely the effect of this measure, the better.

2. Spraying and neutralizing such as leaf damage caused by phytotoxicity, can be used granular 50% humic acid formulated into 3000 times foliar spray; or in the same way 50% humic acid sodium into 5000 times liquid After irrigation, the leaves will turn green gradually after 3~5 days. If borates from Bordeaux solution produce phytotoxicity, 0.5% to 1% of lime solution can be sprayed to eliminate phytotoxicity; if phytotoxicity is caused by lime sulfur, 400 to 500 times of rice vinegar should be sprayed on the basis of washing. Solution can reduce phytotoxicity; If misuse or excessive use of organophosphorus, pyrethroids, amino methyl esters and other pesticides cause phytotoxicity, spray 0.5% ~ 1% of lime water, detergent powder, soapy water, wash clean Water, especially ammonium bicarbonate alkaline fertilizer solution is better, not only detoxification, but also can play a role in promoting growth and development outside the root.

3. Immediately after applying fertilizer, fruit trees suffer from growth retardation and growth weakness and must be topdressed in a timely manner (nitrogen, phosphorus, potassium, and other fertilizers or thin human waste) in order to promote the recovery of the affected fruit trees as soon as possible. If the phytotoxicity is caused by acidic pesticides, some grass ash and quicklime can be sprayed, and the heavy pesticides can be sprayed with 1% bleaching liquid. For the pesticide harm caused by alkaline pesticides, acid fertilizer such as ammonium sulfate can be applied. Regardless of the kind of injury, spraying 0.3% urea solution plus 0.2% potassium dihydrogen phosphate mixture on the foliar spray, spraying once every 15~17 days, and spraying 2~3 times, can reduce the injury.

4. Injecting clear water In the treatment of stem borers of the genus Borealis, Giardinus, and C. syriacus, the phytotoxicity caused by the high concentration of the drug should immediately inject a large amount of fresh water into the tree from the wormhole on the trunk, and make The water flows outward to dilute the pesticide. If it is an acid pesticide, the proper amount of quicklime can be added to the water injection solution to accelerate the decomposition of the pesticide.

5. After cultivating the arable crops, timely cultivating loose soil (depth of 10-15 cm) on the garden and artificially raising the roots, adding phosphorus and potassium fertilizers to improve the permeability of the soil and promoting the root system. Develop and enhance the ability of fruit trees to recover.

6. After proper pruning of fruit trees has been damaged by phytotoxicity, pruning should be carried out in an appropriate amount in time, cut dead branches, and remove dead leaves to prevent the spread of dead parts or infection by pathogens.

7. Suspend the use of similar drugs before the complete release of the injury, minimize the use of pesticides, especially the use of similar pesticides to stop using, so as not to increase injury.

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