Like its name, corn borer is a major pest that harms corn. When the hot weather arrives, and the rainy weather, the corn borer in the cornfield can be described as a serious hazard. How to do well the prevention and control measures of corn mash is one of the most important agricultural operations of the current agricultural people.
Occurrence characteristics and regularity of corn borer
The occurrence of any pests and diseases has its roots; the corn gluten is no exception. For corn borer, environmental factors, planting factors, and insect population are the three major factors affecting insects.
1 Environmental factors: The physiological habits of corn borer determine their preference for high temperature and high humidity. Therefore, 7~9 is in high temperature and rainy season, and the incidence is heavier; even in some areas, the damage of corn borer occurs in June. In terms of temperature and humidity, the temperature is 22~28° and the relative humidity is about 60%, which is most suitable for the development of corn mash. Adults lay eggs and hatch behaviors are most vigorous at about 90% relative humidity. During the corn growing season, it can meet the temperature and humidity conditions of the corn borer attack; this also leads to the high incidence and common occurrence of corn borer.
2 planting factors: affected by different sowing dates, the damage of corn borer is also different. If the heart stage of the corn (the pollination period) is just in the period of adult spawning and larval hatching, then the serious damage can be expected. At the same time, the mixed planting mode is often more serious than the single cropping; reducing the planting area in spring and expanding the planting area in summer can effectively reduce the damage of summer corn.
3 Insect base number: The size of the insect source base in winter is proportional to the amount of eggs laid in the field and the amount of damaged plants. The number of insect populations is large, and the more wintering bases, the more harm to the corn borer in the coming year.
How to prevent corn glutinous rice?
1 Selection of improved varieties: Selection of insect-resistant, insect-resistant leaf erect corn varieties is the most basic way to reduce the incidence of pests and diseases. Reasonable close planting, comprehensive consideration of various reasons such as seasons and varieties, and the number of plants per acre.
2 Reasonable fertilizer and water: Strengthen the management of fertilizer and water to ensure sufficient nutrient supply. Potassium fertilizer can be added as appropriate, but the amount of nitrogen fertilizer applied should not be applied.
3 prevention time: Generally, we choose to prevent and control before the third instar of the larva. In the wintering cornfield, the larvae of the corn borer tend to lurk in the cornstalks and cobs, waiting for the timing of development. Therefore, prevention and control at this time is more effective in preventing it. The heart and leaf stage should be focused on prevention and control, because the corn borer has begun to eat the leaves.
4 physical control: according to the characteristics of corn borer adult crouching, physical control. They are active at night and have a strong phototaxis. So you can set up insecticidal lamps in the field to trap adult insects. The light was turned on at 8:00 every night before the emergence of the wintering corn carp, and the light was turned off at 5 am the next day for one month. Remember to collect the dead corn borer intensively.
5 chemical control: heart leaf stage is a critical period of prevention and treatment. This is the time period that is most necessary to prevent and control, and it is also the best stage. The granules were prepared by mixing Bacillus thuringiensis and fine sand and poured into the corn heart. The general dosage is 50-100 g per acre.
6 Biological control: The common natural enemies of corn borer are mainly Trichogramma, ladybug and so on. Conditional agricultural friends can place natural enemies in the corn field according to the occurrence of corn borer. Trichogramma is very effective against corn borer and costs are low. Trichogramma is released during its spawning period and peak period, which can effectively prevent and control the large area.
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