Recently, some farmers said that there are many nocturnal moth pests planted in cabbage in previous years, and the harm is more serious, not only reducing the yield of cabbage, but also reducing the commerciality of cabbage, and many vegetable farmers are helpless to nocturnal moth pests.
First, the pathogenesis of nocturnal moths
The species of nocturnal moths mainly include twill moths, beet moths, kale moths, in August, September is a high incidence period, kale moth in the open autumn planting of cabbage, cabbage and other vegetables have a peak period. The twill moth prefers a warm and humid environment, and the rainy autumn is conducive to the more frequent occurrence of the insect. In addition to harming cruciferous vegetables, beet nocturnal moths also harm crops such as tomatoes and green peppers, and are commonly planted in summer sheds.
Second, the harmful characteristics of nocturnal moths
When the early larvae of the moth species harm Chinese cabbage, they only eat on the back of the leaves, leaving the epidermis to form a dense membranous transparent hole, and then the larva gradually disperses the damage, which can eat the leaves into only leaf veins, and can enter the leaf bulb to eat, eat the leaf bulb and eat it empty, and leave a large amount of feces to pollute the leaf bulb.
Third, the method of controlling nocturnal moths
Generally, the comprehensive prevention and control method based on chemical control is adopted. This includes ploughing the land in winter, eliminating some of the overwintering pupae, and using black light lamps and sweet and sour liquor venom to trap adult insects. Where possible, larvae can also be killed artificially, or the eggs of nocturnal moths can be trapped in the field, for example, the eggs of nocturnal moths can be destroyed by releasing dazzling bees and grasshoppers.
1. Use of black light
In the period of nocturnal moth pests, concentrate on eliminating adult insects, use the phototropism of adult insects, set up black lights, the lamp should be 35 to 60 cm higher than the cabbage, wait 10 to 15 cm to put a basin of water, the water dripped with kerosene to prevent the falling adults from escaping.
2. Preparation and use of sweet and sour wine venom
You can mix well with 3 servings of brown sugar, 1 part of wine, 4 parts of vinegar, 2 parts of water, and add a little bit of insects. When used, put the venom into a basin, place it on a tripod 1 meter above the ground, cover it during the day, open the lid every night to trap the moth, check the amount of the moth in the next morning, and replenish the vinegar once.
Now it is the cabbage seedling stage, and the temperature environment in autumn is more suitable for the reproduction and harm of nocturnal moths, so it is necessary to prevent and control in advance to create a good condition for the growth of cabbage.
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About the Author:
Fu Yong, one of the expert members of Mr. Fu's planting team, graduated from Henan Agricultural University and is a senior agronomist.