The two-pointed moth is a major pest that has harmed the summer maize seedling stage in recent years. With the application of the wheat combine harvester, a large or all of the wheat straw stubble remains in the field, and a large area suitable environment has caused the pest to increase year by year. Generally, the rate of insects in corn fields is more than 20%, and the number of insects can reach 30%-50%, causing serious damage. Therefore, it is necessary to take preventive measures as soon as possible and find that larvae are timely treated for chemical control.
First, the characteristics of occurrence. Adults of the two-pointed moth are phototropic, nocturnal, and peak from early June to early July. Adult eggs are scattered in the base of the corn seedlings and nearby soil, and the egg stage is 3-5 days. A female can lay 300-2000 heads and lay a large amount of eggs. The larvae endangered the summer maize seedlings from the end of June to the beginning of July. The larvae were afraid of light and had a suspended animation. The worms contracted into a "C" shape. The larvae after hatching hide under the broken wheat straw in the rhizosphere of the corn or the surface soil layer of 2-5 cm harms the corn seedlings, and the other one has 1-5 heads, more than 20 heads, and 3-5 leaves in the corn. The basal part of the corn stalk forms a 3-4 mm round or elliptical hole, causing the plant heart to wither and die; the corn 8-10 leaf stage, or biting the main root and secondary root of the corn, causing lodging, and severe death. Therefore, the end of June to the beginning of July is a critical period for drug control.
Second, the conditions occur. Adults and larvae of the genus Noctuidae prefer a concealed and humid environment. In recent years, wheat fields harvested by large-area wheat combine harvesters, large residues of wheat straw and wheat stubble in the field, have become the best environment for adult concealed habitat, spawning and larval activities. . The locusts of the genus Diptera are unevenly distributed in the field, and the plots and areas with high density of wheat straw stalks are heavier. Even in the same corn field, the areas covered by wheat stalks are not harmed by the worms. There are many larvae hazards. Generally, there are many light rains and the soil is moist, which is beneficial to the adult, larvae and egg hatching of the larvae, and the insects are heavy.
Third, preventive measures. According to the degree of hazard, take appropriate preventive measures. For the land that is less harmful to the larvae, the wheat stalks and wheat stalks in the field should be cleaned up after the sown, and the wheat stalks and wheat stalks in the sown line should be removed and placed on the ridges. For the plots where the damage is more serious, the wheat stalks and wheat stalks in the field are cleaned up and the wheat stalks and wheat stalks in the corn fields are cleaned to the fields. When clearing wheat straw, you must master the corn seedlings at the base without straw, firewood and other coverings, and expose the soil at the base of the corn seedlings. In this way, the favorable environment for pests can be controlled, so that the pests do not have habitats. For the plots where the damage is serious, the mechanical cockroaches can be used, that is, after the wheat harvest, the smashing machine or the shallow slashing Then plant the corn. No matter which precautionary measures are taken, it is mainly to destroy the suitable ecological environment of the genus Diptera, so that there is no place to survive. This is the key to preventing and alleviating the occurrence and harm of the larvae.
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