Corn borer, also known as corn borer, belongs to the genus Lepidoptera. The first-instar larvae "hidden" licking young leaves to form pinhole mosaics, and after three years of age, they form foraging holes and begin to transfer into the stems, which are harmful to tassels, filaments and ears. The damaged corn grows weak and the ears develop. Bad, the impact is strong. The occurrence and damage degree of corn borer is directly related to the meteorological conditions, the number of natural enemies, the planting system, and the variety, in addition to the direct winter base. The suitable temperature is 16-30 ° C, and the relative humidity is above 80%.
Prevention:
The control of corn borer requires a combination of four. That is, the combination of wintering prevention and field control; heart leaf prevention and control combined with cutting prevention; chemical control combined with biological control; corn control combined with other host crops.
1. Agricultural control. Before the wintering larvae in the spring, the corn stalks are treated by burning wood, manure, and feed, and the number of wintering larvae is reduced.
2. Biological control. At the end of the corn glutinous egg to the end of spawning, the red eye peak is released 2-3 times, and 10,000 to 20,000 heads are released every 667 square meters. It can also be sealed with Beauveria bassiana, and 100g of bacteria powder (50-100 billion per gram of spores per cubic meter) is sprayed on the sputum before the corn mash.
3. Chemical control. At the end of the heart leaf, the rate of flowering plants is more than 10% for general treatment, 5% to 10% for treatment, and 5% or less can be used without medication. If the mosaic rate exceeds 20%, or 100 corns have more than 30 eggs, it is necessary to prevent 2 times. At the ear stage, the rate of insects is 10% or there are 50 heads of larvae, which should be controlled immediately. 3.6% of insecticidal double granules can be used, 1 kg per 667 square meters, or chlorpyrifos? Chloroflower is applied to the sheath of 350-500 grams per 667 square meters, or 18% insecticide per 667 square meters. Double water agent 10 times liquid holding sprayer snack (dry period).
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