Symptoms and remedies for the pesticide harm of sugar orange

Symptoms of pesticide phytotoxicity:

One: Spot: mainly occurs on the leaves, sometimes on the branches and fruits. Common symptoms: brown spots, yellow spots, dead spots, net spots.

Two: yellowing: occurs in the stems and leaves of plants, and it is more common to cause yellowing of leaves.

Three: deformity: occurs in the stems, branches and leaves of plants. Common symptoms: rolled leaves, plexus, deformed ears (fruit) and so on.

Four: Withered: often the whole plant shows symptoms, most of which are caused by herbicide phytotoxicity.

Five: shedding: falling leaves, falling flowers, falling fruits.

Six: growth stagnation: phytotoxicity inhibits the normal growth of crops.

Seven: Inferior fruit: After the fruit is harmed, the volume is small, the peel is abnormal, and the quality is deteriorated.

Eight: Infertility: It is the phytotoxicity caused by improper use of the crop during reproductive growth.

Remedy:

1. Water spray or irrigation: spray water after spraying pesticides on the foliage, and dilute and wash off the pesticide attached to the foliage and branches to reduce the pesticide content in the tree. If the soil application of furandan granules or other spray (application) herbicides causes phytotoxicity, drainage and washing measures should be taken. , that is, first flood irrigation, after washing 1-2 times to wash the residual pesticides in the soil.

2, spraying (fertilizer) neutralization: organic phosphorus, pyrethroids, ampicillate pesticides caused by phytotoxicity, can spray 0.5-1% lime water, washing powder, soap water and other alkaline substances, neutralization and detoxification . In particular, it sprays 0.5-1% of ammonium bicarbonate and other alkaline substances to neutralize detoxification. Especially with 0.5-1% ammonium bicarbonate and other alkaline fertilizer solutions, not only can detoxification, but also play a role of topdressing, and promote recovery, (concentration should be appropriate, so as not to add important harm).

3, timely topdressing: acid pesticides, planting grass ash or quicklime on the ground. Alkaline pesticides, acid fertilizers such as ammonium sulfate (fertilizer powder) on the ground. No matter which kind of pesticide poisoning, the leaf surface should be sprayed with 0.2-0.3% potassium dihydrogen phosphate for foliar topdressing, once every 10-15 days, even spray 2-3 times. Or spray 0.01% brassinolide.

4, injection of clear water: control of stems and other tree trunk pests, due to excessive drug use caused by phytotoxicity, should immediately inject a large amount of water into the tree at the trunk of the tree trunk, and let it out to dilute the pesticide. Such as acidic pesticide poisoning, add appropriate amount of lime in the injected water to accelerate the decomposition of pesticides.

5, loose soil / soil: cultivating loose soil (10 ~ 15 cm), increase the application of phosphorus and potassium fertilizer, promote root growth.

6, the right amount of pruning: cut off the dead branches, timely removal of dead leaves, to prevent the spread of dead leaves and leaves the tree water evaporation and increase the phytotoxicity and death.