Attention to cure corn borer and corn red spider

Taiyuan Plant Protection and Phytosanitary Station recently discovered in the city's farmland survey that the corn spider mite was planted in the southern cornfield of Taiyuan and the planting type such as “Xianyu 335” corn field began to take place, which is about 10 days earlier than usual. Qingxu and Jinyuan are more important than corn planting areas in the northern part of Taiyuan. The amount of insects is mainly concentrated in the lower part of the corn with 1 to 3 leaves. The corn borer occurs in most of the southern corn fields. The planting rate is about 50%, and the plant has more than 200 planthoppers. Some plants have already occurred in the whole plant.

Since late July, there has been less precipitation in Taiyuan, and drought has worsened. Weather Forecast The city's precipitation in August is about 110-130 mm, which is close to the same period in normal years; the temperature is between 20-22°C, which is slightly lower than the average year. It has some inhibition effect on the reproduction of red spider and corn borer. However, the temporal and spatial distribution of summer precipitation in Taiyuan City is not uniform, and suitable weather conditions in short time are conducive to the rapid breeding of these two insect pests. It is expected that the occurrence of corn red spider mite and corn borer will occur in the middle and early August. Therefore, it is recommended that relevant departments quickly investigate the area of ​​occurrence and density of populations of the local corn borer and corn spider mite, and promptly organize and mobilize the masses for effective control to ensure the safe growth of maize in the middle and later stages.

Prevention advice:

1. Strengthen monitoring: The occurrence of corn borer and corn spider mite is affected greatly by climatic conditions. Plant protection departments at all levels should increase monitoring and early warning, expand the scope of investigations, keep abreast of weather changes and occurrences, and issue timely forecasts to promote prevention and control. technology.

2. Chemical control: For corn spider mite and corn cocoon spotting areas, we must promptly remove the bottom worm-blade, bring it out of the field for centralized treatment, or use a fumigating agent to prevent and cure; for the recurrence area, apply a fog machine and The sprayer can be sprayed on both sides in a straight line; cutting and controlling methods can be adopted for contiguous corn fields.

The control of spider mites can be selected as follows: 1.8% abamectin 1000-fold, or 20% fenpropathrin 2000-fold, or avenin sulfone 2500-fold spray. The control corn borer can be selected as follows: 10% imidacloprid 1200 times, or 3% acetamiprid 1500 times spray, 2 times in succession. The application of pesticides in the hot season should be performed in the morning and evening. Beware of poisoning accidents.