In recent years, Mulberry Mulberry has become the main pest in the fall mulberry field in Sheyang County, Jiangsu Province, especially in October. According to this year's survey, the average amount of mu worms has reached more than 30,000, and the number of field plots has reached more than 50,000, and the yield and quality of mulberry leaves have been significantly affected. This is likely to cause insufficient silkworm mulberry leaves and silkworm disease outbreaks in autumn. I. Difficulties in prevention and control of mulberry trees 1. When mulberry plants occur, generations overlap. It is difficult to control the time. Normal years Mulberry plants occur 5 to 6 generations a year in our land, but there is insufficient understanding of the difficulty of prevention and control caused by generation overlapping of mulberry plants. According to the survey, the second generation of mulberry in the second half of July had overlapping generations, that is, larvae at the same time, the eggs, cockroaches, adults are occurring, from August to September larvae of larvae harm is almost uninterrupted Even after the mulberry tree was harmed, it was transferred to other mulberry trees and continued to be harmed. The entire mulberry field suffered damage. 2. Mulberry leaf rolling habits, drug use is difficult to completely mulberry after 3rd instar start after the beginning of the volume of harm in the leaves, because the mulberry larvae rolled inside the mulberry, it is difficult to direct contact with the spraying of pesticides, control effect is difficult Guarantee. 3. The mulberry tree is tall, and it is difficult to consider the spraying. The mulberry height is generally more than 2 meters from July to September. The knapsack sprayer has a dilemma: First, it is difficult to operate in the mulberry garden, and spraying is difficult; the second is Due to the small amount of pressure, it is difficult to use foot medicine. 4. Limitations of pesticide species, affecting pest control effects Only from the point of view of pest management, there are many types of pesticides available, but in October it is the season of sericulture. To ensure the safety of silkworms, there are few suitable pesticides. Second, the mulberry prevention and control points 1. Grasp the right time for prevention and control of the mulberry is the most suitable period before the larvae 3 instar, when the larvae are mainly concentrated on the top of the mulberry tree on the damage, no leaf hidden, from hatching to volume Leaves 4 to 5 days, insects small drug resistance is weak, this time is the best period of medication, once the missed opportunity, the control effect will not be guaranteed. First, we must carefully observe the investigation to determine the appropriate period of prevention. A survey was conducted every 2 days. Before 8 o'clock in the morning, observe the top buds of mulberry trees. If there are filaments around the top buds and leaves, the buds are not in the correct shape. Look at the buds again. There are small larvae in between. In the whole mulberry field, if the top bud of the insect is found to reach 10% to 20%, the medicine is started. Second, we must spray regularly to consolidate the control effect. After the first spraying, spraying should be performed every 8 to 10 days. This is because the overlapping of mulberry generations is serious. If the medicine is not used regularly, the damage of mulberry will gradually increase, leading to outbreak of control and affecting the production of autumn silkworms. 2. Use a suitable sprayer to master the correct method of spraying. In the appropriate period of the above-mentioned prevention and control, spraying the medicine on the top of the backpack sprayer can achieve the purpose of controlling mulberry. If combined with the control of other pests, it is best to use a misting machine or other spray higher medical equipment, spraying up and down, but must cover the top spray, in order to achieve better control effect. 3. Select appropriate pesticides and formulate a reasonable concentration of the top of the spray treatment of mulberry, not feeding farmers in the mid-autumn silkworm, may choose to use DDOX phoxim 12 ml, killing 1 bag, plus an aldosterone special 1 bag; Mid-Autumn Silkworm can use phoxim, the concentration of which is about 1000 times. These pesticides have both contact toxicity, smoke killing and stomach poisoning effects, and have a short residual period, which helps to ensure the safety of silkworms. 4. Dividing and controlling insects, the interval between the application and the development of mulberry larvae are suitable for the development of mulberry during the period of sericulture will also occur at the same time, if the medication interval and the control period is staggered or died, can cause increased harm. The insecticides should be divided into appropriate patches and pesticides should be used. Short-term pesticides should be used. After harvesting, the leaves should be tested and fed to ensure the safety of silkworms. 5. Rolling leaves, reducing the base number of insects due to insecticides inevitably leaking insects, leaf wounds will be 3 years later, in order to reduce the number of insects, the volume of mulberry leaves can be removed together with the treatment, Effectively reduce the population base.
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