Nocturnal moths are a common pest on vegetables in summer and autumn, especially under the favorable conditions of drought and little rain in summer!
There are mainly kale nocturnal moths, twill moths, pink-spotted nocturnal moths, etc., of which kale nocturnal moths occur the most seriously. It mainly harms cruciferous vegetables, spinach, broad beans, kale, etc.
1. Cabbage nocturnal moth
It is an intermittent and localized pest, which is the co-age of the larvae with pest symptoms, and the newly hatched larvae are clustered on the leaf back, and only eat the leaf flesh at night, leaving the epidermis, showing a "small skylight". During the day, it lurks under the leaves, vegetable hearts, on the ground or under the rhizosphere soil blocks, and comes out at night to overeat, eat the leaves into a lack of moments or eat all the leaves, and after eating a piece, migrate to the adjacent field in groups.
Prevention and control methods
1. Conditional can use natural enemy control, different periods of time without the same natural enemy control, the use of parasitic bees and grasshoppers in the egg stage, the use of parasitic flies, bees and small cocoon bees in the larval stage and pupae stage.
2, the use of adult insects like sugar cool habits. Bait can be placed on a sticky board, or some potion to control kale moth can be mixed on top of the bait, and the bait formula can be formulated in the ratio of essence: vinegar: water = 6: 3: 1.
3, pharmaceutical control: the use of lice mite urea, methyl salt, exterminating urea, insect mite nitrile, etc., spraying time to seize the travel habits of kale nocturnal moth, in the evening spraying is a better choice!
Second, the twill nocturnal moth
Twill nocturnal moth has omnivorous, explosive, strong fecund characteristics, can harm a variety of crops, the harm to vegetables is particularly serious, larvae eat leaves, buds, fruits, excretion of feces to facilitate pollution on the plant, and even cause plant rot, loss of commodity value, serious occurrence of the whole field plant on the ground is all eaten, resulting in reduced yield, quality degradation, and even harvest failure.
1, the use of twill nocturnal adult phototropism, and like the habit of sweet and sour, we can use insect trap lamp and sweet and sour solution to trap adult insects, reduce the chance of pest mating, control the next generation of insect mouth base!
2. Remove weeds and fallen leaves in and around the field in time, and concentrate on treatment to reduce the source of residual insects.
3, medicinal prevention: can be used to bacillus thuringiensis, methyl vitamin salt, urea, etc., sprayed in the evening, 7-15 days spray once!
3. Pink-spotted nocturnal moth
It mainly harms cruciferous vegetables such as cabbage, kale, broccoli, kale, etc., and crops such as lettuce, beets, peas, celery, coriander, tomatoes, potatoes, and caryophyllus. The main symptoms of harm are feeding on leaves into missing notches or holes, adults are phototropic in nocturnal activity, and eggs are scattered
The leaves are obverse and lay an average of 280-350 eggs per female.
Prevention and control methods:
1. Clean the countryside in time after harvesting, and eliminate pupae and larvae to reduce the source of insects.
2, it is also roughly the same as the control of nocturnal moths, using phototropism, prevention and control of insect traps and so on for booby traps.
3. Pharmaceutical control: spray 25% urea or matrine 500 to 800 times liquid at the peak of egg hatching, so that the larvae cannot molt normally, metamorphose and die. Mixing with threthroid agents 3000~4000 times liquid has a synergistic effect.