Beware of cotton red leaf stem blight after the rain
After the rainstorm, it is easy to break out the red leaf stem blight. Red leaf stem blight is a physiological disease that starts from the growth point of the main stem or the top of the fruit branch, generally from top to bottom and from outside to inside. The main stem was withered and died, but the anatomical catheter was colorless. The root system is short and short, and the roots are less stunted. It is necessary to timely carry out pesticide control.
The causes of cotton red stem stem blight are as follows: first, extensive cotton field cultivation, poor cotton root development, second cotton field with poor cotton drainage; third, partial nitrogen fertilizer, strong cotton growth, cotton field shading; fourth, less organic fertilizer, poor soil fertility . It can be seen that when the climate changes abruptly, some cultivated environments are poor, and cotton with physiological dysfunction is prone to red leaf stem blight.
To control the stem and blight of cotton red leaves, we should focus on the following points: First, control and promote the ability to resist stress. First, for the cotton that grows prosperously, apply the plant growth retardant ketamine or auxin, and use 2-3 grams of ketamine or 8-12 ml of water to spray 50 kg of water per acre. The second is to strengthen the cotton field in the soil, timely cultivating and smashing the plate to enhance the performance of the show; the third is to the cotton field with lower terrain, pay attention to the gully at any time, promote the cotton roots, and the fourth is In the cotton field where double-film cultivation is carried out, the mulch film should be removed immediately, so that the cotton roots develop in depth. Second, increase the application of potassium fertilizer to improve the efficiency of fertilization. According to the China Pesticide Network , potassium deficiency is one of the leading factors inducing stem blight of cotton. For two types of cotton fields with potential potassium deficiency or less potassium application, 10-15 kg of potassium fertilizer should be added per mu. One can meet the needs of cotton for potassium fertilizer; the second can adjust the cotton fertilizer ratio structure. Improve the utilization rate of nitrogen fertilizer and phosphate fertilizer. Third, the root spray, improve the oxygen supply and fertilizer environment. Cotton with red leaf stem blight, as long as the cotton leaves have not withered, the main stem growth point is still active, and the fertilization function can be quickly restored by root dressing. First, use 100 ml of humic acid active liquid fertilizer per mu, spray 50 kg of water, not only to quickly supply fertilizer, but also to improve soil oxygen supply; second, use 100 g of fertilizer per acre to spray 50 kg of water, It is supplemented with a large number of elements and trace elements; the third is the spraying of plant growth agent "802", which can accelerate cell division and enhance cotton self-regulation ability.
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