Mulberry pesticides precautions
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1. The method of operation overcomes one-sidedness. Many silkworm farmers think that the liquid that is sprayed when pests are inflated is as good as possible. Therefore, large-aperture nozzle sprays are used, resulting in large droplets. This method seems to have improved efficacy. In reality, this is counterproductive because of the large droplet size. Pesticides are not easily attached to mulberry leaves or insect bodies; on the other hand, the time for the drug solution to stay in the air is short, which reduces the chance of contact between the drug solution and the parasites and mulberry leaves, thereby reducing the effectiveness of the drug application. In order to catch up with the morning weather, some silkworm farmers often spray in the morning when the dew is not dry, which is equivalent to artificially reducing the concentration of the liquid; if it is sprayed on a sunny day, the liquid quickly evaporates and cannot be well transferred to the body and mulberry leaf. Infiltration; If it rains after spraying, the liquid is washed by rain, then basically no effect of pest control. A lot of silkworm mulberry farm machinery and farm machinery and equipment were mixed, mulberry gardens did not fully wash before the treatment of pesticides, residual pesticides in the high concentration of pesticide contamination of mulberry leaves, often cause poisoning. There is the mulberry field pest in the back of the mulberry leaf damage, and many silkworm farmers often ignore the spray on the back of the mulberry leaf, so pest control effect greatly reduced.
2. Drug selection to overcome singleness. The screening of pesticides in mulberry fields, due to overemphasizing the short residue period, ignored the validity period, which hindered the development and application of mulberry pesticides, and affected the control effect. Coupled with the evolution of pests and the increase in drug resistance and other reasons, mulberry pests generally have relatively large developmental differences. Overlapping generations, overlapping insects, short-lived pharmaceutical residues, and long-term use of a single variety of pharmaceuticals cannot effectively prevent and control the development of mulberry pests. Insect pests in egg stage and flood stage, and are susceptible to drug resistance.
3. Overcome arbitrariness on the concentration ratio. The investigation found that most silkworm farmers do not have metering tools when dispensing, and they generally use bottle cap metering to increase the concentration at random. The insect pests produce rapid drug resistance and the control effect is poor. Only after the concentration increases, a vicious circle is formed. There is no mixing or stirring when dispensing, resulting in a local concentration is too high, due to the concentration of the liquid is too large, from time to time will occur mulberry phytotoxicity and silkworm poisoning phenomenon, and because the drug concentration is not standard, but also increased the resistance of pests The medicinal properties increase the difficulty of future prevention and control work.
4. The prevention and treatment of time to overcome the inconsistency. The production of sericulture involves millions of households, and the timing of mulberry garden pest management is difficult to be unified, which affects the control effect. A mulberry garden is contracted by multiple households and the pest management time is different. There are some cures, some even died during the prevention and treatment period. Some first rule, some after the phenomenon; so pests in the mulberry garden in the first pest control will migrate to the late or incurable mulberry garden, leading to cross-hazard, pest management is difficult to thoroughly. During the pest control process, some silkworm farmers did not use pesticides according to the control period, which destroyed the development schedule of the pest population, making the insects unable to form hatching peaks; and some did not use pesticides during the incubation peak period of the pests, and hatching peaks and sericulture use leaves. At the same time, it cannot be used for medicine, etc. It is often found that when a large number of pests in the field occur, pests are to be found. At this time, the pests have escaped and are in an advanced stage, and the control effect is deteriorated.