The Latest Remedies for Phytotoxicity in Cotton

Cotton is a crop that receives a relatively high number of pesticide applications. During application in cotton fields, wrong pesticide varieties, excessive concentration, improper application methods and other reasons often cause phytotoxicity in cotton, leading to decline in cotton variety quality, reduced yield, or even total crop failure. So how should cotton phytotoxicity be solved? Follow the editor to learn about it.

1. Spray neutralization

If it is damage from acidic pesticides, you can spread some quicklime or plant ash, and for stronger phytotoxicity you can spray a 1% bleaching powder solution onto the leaves. Conversely, if the phytotoxicity is caused by alkaline pesticides, you can apply more acidic fertilizers such as ammonium sulfate to neutralize it. If there is no way to distinguish whether the pesticide is acidic or alkaline, then spray the leaves with a 0.1℅--0.3℅ potassium dihydrogen phosphate solution, or mix and spray 0.3℅ urea solution plus 0.2℅ potassium dihydrogen phosphate solution; both can reduce the economic losses caused by phytotoxicity.

2. Spraying water to wash

If the phytotoxicity is caused by spraying on the leaves and plants, and it is discovered in time, you can quickly use a large amount of clean water to spray the affected leaves. This is because many chemical agents are not resistant to water washing; spraying repeatedly 2-3 times in time can wash away the pesticide remaining on the plant surface and reduce the phytotoxicity. When washing, the pressure of the sprayer should be sufficient and the amount of water sprayed should be large. At the same time, combine with intertillage and loosening of the soil to promote root development and enhance the crop's ability to recover.

3. Irrigation

For phytotoxicity caused by some herbicides or by root-zone irrigation, you can immediately irrigate to wash the soil and leach the residual pesticide into the deeper soil layers. For example, for phytotoxicity caused by the herbicide prometryn, if discovered in time, immediately drain and replace the field water, and thereafter adopt measures such as intermittent irrigation and drainage, which can very well alleviate or reduce the phytotoxicity.

4. Fertilization remedies

For phytotoxicity that causes symptoms such as leaf spots, scorched leaf margins, and plant yellowing, you can spray a certain amount of plant growth regulator on the leaves, or directly spray foliar fertilizer, to promote plant recovery. For herbicides that inhibit or interfere with plant growth, after phytotoxicity occurs, you can spray hormone-type plant growth regulators such as gibberellin to alleviate the phytotoxicity. After crops suffer phytotoxicity, comprehensive remedial measures can be taken according to the type of pesticide and the degree of crop damage, to reduce the harm as much as possible.

The above is an introduction to the remedies for cotton phytotoxicity. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.