Manage corn in summer and solar terms, and beware of pests and diseases.

Every year around August 23rd, people will welcome the summer solar term. Summer is the middle and late period of maize growth, and it is also the high incidence period of various diseases and insect pests. Therefore, farmers who grow corn need to do a good job in corn management and prevent pests and diseases at this time, so let Lao Huangli introduce it to you.

In recent years, with the improvement of agricultural production level, the change of varieties and the change of farming methods, the occurrence and harm of maize diseases have been strengthened. The midsummer, which comes at the end of August every year, is the middle and late period of corn growth, and it is also the peak period of various pests and diseases.

During high temperature in summer, maize leaf blight, leaf blight, bacterial wilt, brown spot and sheath blight are serious. Seedling blight, rough dwarf disease and rust are also serious in some areas, which have a great impact on corn production. It is very important to do a good job in corn management in summer and solar terms.

Causes of aggravation of maize diseases and insect pests in summer

1, this variety has poor disease resistance, which is beneficial to pathogen infection.

2. Continuous cropping makes pathogenic bacteria accumulate in the soil, especially the corn stalks are directly returned to the field without treatment, which increases the number of bacteria in the soil.

3. Rain at harvest or high humidity during storage, large amount of bacteria in seeds and no chemical treatment during sowing are all beneficial to the occurrence of seedling diseases.

4. Partial application of nitrogen fertilizer, less application of phosphorus fertilizer, calcium fertilizer and microelement fertilizer leads to excessive vegetative growth and poor stress resistance.

5. Weak awareness of disease prevention. Because of the high temperature, tall plants and inconvenient application of pesticides in the middle and late growth period of maize, farmers do not know enough about the importance of disease prevention, and generally do not prevent it or prevent it in the later period, resulting in serious diseases.

Control measures of maize diseases and insect pests in summer

1. Promote disease-resistant varieties. Using modern high-tech to cultivate multi-resistant varieties and improve the coverage rate of improved varieties.

2. Seed treatment. Coating with Lexmark, Ricardo and corn seed coating agent can kill pathogenic bacteria carried by seeds and prevent seedling diseases.

3. Crop rotation. Rotation with non-gramineous crops to reduce the accumulation of pathogenic bacteria.

4. Strengthen on-site management. Apply more decomposed farmyard manure, increase phosphorus, potassium and trace fertilizers; Reasonable close planting, timely intertillage and fishing will create an environment conducive to the growth of corn without the occurrence of diseases.

5. Clean the countryside. Remove the diseased leaves at the bottom in time, take the diseased body out of the field and destroy it after harvest, so as to reduce the initial infection source of the disease.

6. Strengthen technical guidance. Formulate indicators for prevention and control of major diseases, make predictions and promptly guide farmers to carry out prevention and control.

7. Use drugs scientifically. When the seedling is rainy, carbendazim and Woliguo should be sprayed as soon as possible to control seedling blight and sheath blight. In dry years, timely spraying aphid killer, industrial dust and other vectors to control aphids, Laodelphax striatellus, etc., and spraying virus A, OS-Sterling, bacterial toxins, etc. at the initial stage of rough dwarf disease and dwarf mosaic disease. In the fields where rust and sheath blight are serious, use Heguoli and Fenxiuning to control them.