The genus Lepidoptera and Noctuidae are the important migratory omnivorous pests of crops in China. The larvae bite on the leaves, and in severe cases, only the veins are left in the leaves, causing severe corn yield reduction. When the armyworm is severe, it will form a catastrophic disaster. In 2 to 3 days, the whole crop or even the weed leaves will be eaten up. What about corn worms?
Corn borer
The damage of corn borer is mainly because the leaves are eaten by larvae, which will reduce their photosynthetic efficiency; the tassels are easily smashed and often break, affecting pollination; the leaves and filaments are foraged, which will cause granules and stalks; After the stalk, ear stem and cob are foraged, a tunnel is formed to destroy the water and nutrient transport in the plant, so that the stalk rate is increased and the grain yield is decreased.
Two-pointed moth
The larvae of the larvae of the genus Noctuidae mainly bite the base of the corn stalk, forming a 3-4 mm round or elliptical hole, cutting off the nutrient transport, causing the above-ground corn leaf wilting to die. In the larger corn seedlings (8-10 leaf stage), the larvae mainly bite the roots of the corn, including the aerial roots and the main roots, causing the corn to fall, and the severe ones die. The hazard strain rate is generally between 1% and 5%, and the severe plot is between 15% and 20%.
Beet armyworm
The first-instar larvae of Spodoptera exigua are in the back of the leaf, and the food intake is small. After 3 years of age, the disperse is harmful, the food intake is greatly increased, and the crouching is nocturnal, which damages the leaves and becomes nicks. In severe cases, the meat can be eaten, leaving only the meat. The veins are even stripped of the stem cortex. The larvae can move in groups, slightly disturbed by the earthquake, and have a suspended animation. After 3-4 years of age, during the day, it is hidden in the lower part of the plant or in the soil, and it is removed in the evening to take food.
How to prevent it?
When the armyworm outbreak occurred in 2012 and the night moth was raging in 2014, many corn insecticides were generally effective in controlling the insects. In the end, through the large-scale application and control of the salt of the vitamin A, the development of the insects was effectively controlled and recovered. A lot of losses! Why is it effective in controlling these pests?
Efficient, broad spectrum
It is characterized by high efficiency, broad spectrum, safety and long residual effect. It is an excellent insecticidal and acaricidal agent with high activity and is not easy to make insecticide resistant. For human and animal safety, it can be mixed with most pesticides.
High temperature activity multiplication
The insecticidal virulence increases sharply with increasing temperature. Above 25 ° C, the toxicity of the vitamin A is greatly increased, and can even be increased by more than 1000 times. The temperature in the late growth stage of corn is generally above 28-30 °C, and this high temperature activity of the vitamin A salt can just be well controlled at this stage!!
Good compounding performance
The compounding activity is stronger, and the vitamin A salt has been tested in a large amount in the use. It is found that the addition of the pyrethroid pesticide when using the vitamin A salt can improve the quick-acting effect, and the effect of the interval is better during the growth period of the crop. (At present, there are 0.2%, 0.5%, 0.8%, 1%, 1.5%, 2%, 2.2%, 3%, 5%, 5.7%, etc. registered in China, and 3.2% of cyanuric chloride preparation.)
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