Causes and Prevention of Apple Outbreaks

The apple-winged moth is also called small wing moth, small penetrating feather, and worm. In recent years, it has become commonplace in some places. Almost all apple orchards have occurred and have risen to a major pest. To this end, we conducted a survey summarizing the following briefs:
First, the law of occurrence

The worm in our land is mainly responsible for the damage of the apple. It occurs once a year, 2-3 years in winter under the damaged cortex, and after the fruit tree sprouts the next year, the overwintering larvae begin to move and feed. The young larvae grow from late May to early June. Prior to phlegm-removing, a round feather hole is bitten in the victim's area, but it does not bite into the epidermis. Then the insects and sawdust are stuffed with silkworms to make a long ellipse. The pupa period is 10 to 15 days, and the emergence begins in mid-June. Out of adults, the oyster shell will be taken out of part of the eclosion, exposed to the emergence hole, from late June to late July for the emergence of a feast, adults active during the day, spawning 2 to 3 days after mating, a female moth lays 20 ~ 25 capsules, eggs in the trunk and branch of the rough skin, cracks, scars, spawning mucus first, so that the larvae hatch into the cortex, in November began to do the wintering.

Second, the cause of the outbreak

According to our survey of 30 orchards in 10 villages, the rate of the occurrence of the larvae in the Chengyuan Garden was 100%, the tree rate was 68%, and the maximum number of larvae reached 233. Some of the main twigs were killed and brought to production. Serious losses.

The reasons for analyzing the outbreak are: First, ignore the scraping. In recent years, with the popularity of bagging rates, most fruit growers believe that paper bags have prevented the invasion of rot pathogens, thus relaxing the treatment of rough skin on the trunk, and at the same time increasing the area of ​​orchards, many growers do not have time to scrape the bark. It provided a favorable place for the occurrence of this pest. The second is not spray the trunk. According to the survey, nearly 50% of the fruit growers do not pay attention to the spraying of trunks and large branches each time they are sprayed, and the larvae are not exposed to insecticides and cannot be effectively controlled. This is one of the reasons for the occurrence of large moths. . The third is the reduction of medication. In the past few years, the orchards that were not bagged usually sprayed 10 to 12 times a year. Most of the gardens are now bagged, and the number of medications is also reduced. Generally, they are sprayed 7 to 8 times, and there is less chance of adult and larval drug spraying. The high incidence is also natural. Fourth, the tree vigor is weak. Because of the lack of input, excessive results, early leaves, etc., the decline of tree vigores accounted for more than 30%, and the tree vigors were naturally more cracks and rots, thus creating favorable host conditions for the occurrence of this pest.

Third, control methods

Scrape the bark before sprouting. Observe the cracks in the sickle and the branches, particularly the worm-producing areas. Dig out and kill the insects after finding the worms. This method is more laborious, but it serves two purposes, killing insects and eliminating pathogens, the effect is also good, can kill most of the larvae.

After smearing and before germination, a 1:1 mixture of insecticide and waste oil is applied to the trunk at 20-30 cm from the ground. In order to increase the amount of osmotic absorption, the dead skin may be scraped off at the application site to expose the fresh skin, but it is better not to injure the epidermis to prevent burns, and to increase the width of the application appropriately, generally requiring 20 to 25 centimeters. This measure can be used to kill Dead parts of the larvae remain.

When the spray is sprayed during the growing season, all the upper, lower and north-south trunks must be sprayed evenly until the liquid flows down the trunk to kill subcutaneous larvae and newly hatched larvae. From June to July, special attention was paid to the prevention and treatment of adult emergence during the emergence period. Effective pharmaceuticals include organic phosphorus such as roxen and pyrethroid pesticides such as cypermethrin.

Through investment in fertilizers and water, deep-enlarging and expanding holes, reducing loads, preventing early defoliation, and strengthening tree vigor to reduce rot disease and cracks, it creates an environment that is not conducive to the breeding and invasion of pests. In general, the input of organic fertilizer is not less than 3 cubic meters and the chemical fertilizer is not less than 1,000 yuan (current price). The depth of soil is less than 60 cm. In the situation where there is sufficient fertilizer and water, the yield per mu is controlled within 5,000 kg.

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