The beet armyworm, the scientific name Laphygma exigua Hubner, is a pest of the Lepidoptera, and is also known as the Spodoptera frugiperda. The main hosts are more than 170 kinds of vegetables and plants such as cabbage, broccoli, radish, lettuce, tomato, green pepper, eggplant, potato, cucumber, zucchini, kidney bean, fennel, carrot, celery, spinach, leeks, etc. , migratory, gluttonous, cosmopolitan, intermittent large pests.
In recent years, due to changes in crop cultivation methods and global warming factors, it has gradually evolved from an accidental pest to a perennial multiple pest, which occurs in the south of China for up to 10 generations a year, except for the first The 2 generations are easier to divide, and the rest of the generations overlap. Among them, the most serious damage from May to August has risen to one of the major pests in the major vegetable producing areas, posing a serious threat to vegetable production.
Its special physiological structure and living habits make it more difficult to control than the general pests, and the technical requirements for medication are also improved accordingly. Three points should be emphasized in the prevention and treatment of chemicals:
The first is to choose the medicine. Different types of control agents have different control characteristics: the contact-killing agent can quickly kill the pest control damage, but the contact or adhesion of the insect body is the basis for exerting the efficacy, and the planting density is small and the degree of exposure of the insect body is relatively high. Under good conditions, the use of such agents in the early and late activities of beet armyworms is frequent, because the surface of the worms can be evenly treated, so the control effect is better. Stomach-toxic agents need to be toxic after the pests are ingested, and the insecticidal speed is slightly slower than the contact-killing agents, but when the crop planting density is high, concealment or drill collar damage is dominant, due to the presence of a pest feeding time and medicine The hysteresis of the release time, even if the pests fail to receive the medicine when the medicine is used, as long as the pests are fed to the poisonous crop tissue after the medicine is used, the same control effect can be obtained, and the use advantage is obvious. At present, beet armyworm has high resistance to most pyrethroids, organophosphorus and carbamate pesticides. The more effective contact-killing agents are: chlorpyrifos (useful for vegetable export base), 10% efficient Chlorpyrifos (cis-cypermethrin); stomach-based agents are: hit (15% indoxacarb SC), depletion (10% chlorfenapyr SC), content (24% methoxyfenozide SC), Moth (0.15% methamphetamine, 10 million PIB/ml 苜 silver night nuclear SE) and a vitamin salt series products.
The second is to use the quasi-drug. The newly hatched larvae of beet armyworm are harmful to the susceptibility of the medicinal agents. They are suitable for centralized annihilation treatment, and they are scattered at the third age, the resistance is improved, and the difficulty of prevention is increased. Therefore, it is very important to have proper control timing. At the same time, beet armyworm has the habit of crouching and dying, and hiding in the soil gap, plant base or heart leaf during strong daytime illumination. If the drug is selected for feeding in the early morning or evening pest activity, it can be improved. The probability of taking medicine and improving the prevention and treatment effect, especially when using the contact-killing agent, should pay more attention to selecting the appropriate medication time, which is an important factor that directly affects the application effect.
The third is to use good medicine. Some of the existing good dosages for controlling beet armyworm are less, ranging from a few milliliters to several tens of milliliters. Direct dispensing with water often results in uneven distribution of the concentration of the liquid, and it is preferred to prepare the mother liquor with water before use. Then add enough water to dilute to the desired concentration and evenly spray. In the spraying process, try to avoid the fake death habit of beet armyworm, and the spray pressure will cause it to escape and directly affect its drug-receiving effect. For waxes such as cabbage and broccoli. It is best to add a small amount of neutral detergent powder to the crop to improve the wet spreading performance of the liquid and better ensure the application effect.
In short, for the control of beet armyworm, it is necessary to consider the selection and application of the agent in combination with the stage of the pest at that time, the level of resistance, the type of crop, the density of planting, etc., ignoring any one of these factors may be half the effort.
Author: Chengkang Long
From: Pesticide technology
mailbox:
In recent years, due to changes in crop cultivation methods and global warming factors, it has gradually evolved from an accidental pest to a perennial multiple pest, which occurs in the south of China for up to 10 generations a year, except for the first The 2 generations are easier to divide, and the rest of the generations overlap. Among them, the most serious damage from May to August has risen to one of the major pests in the major vegetable producing areas, posing a serious threat to vegetable production.
Its special physiological structure and living habits make it more difficult to control than the general pests, and the technical requirements for medication are also improved accordingly. Three points should be emphasized in the prevention and treatment of chemicals:
The first is to choose the medicine. Different types of control agents have different control characteristics: the contact-killing agent can quickly kill the pest control damage, but the contact or adhesion of the insect body is the basis for exerting the efficacy, and the planting density is small and the degree of exposure of the insect body is relatively high. Under good conditions, the use of such agents in the early and late activities of beet armyworms is frequent, because the surface of the worms can be evenly treated, so the control effect is better. Stomach-toxic agents need to be toxic after the pests are ingested, and the insecticidal speed is slightly slower than the contact-killing agents, but when the crop planting density is high, concealment or drill collar damage is dominant, due to the presence of a pest feeding time and medicine The hysteresis of the release time, even if the pests fail to receive the medicine when the medicine is used, as long as the pests are fed to the poisonous crop tissue after the medicine is used, the same control effect can be obtained, and the use advantage is obvious. At present, beet armyworm has high resistance to most pyrethroids, organophosphorus and carbamate pesticides. The more effective contact-killing agents are: chlorpyrifos (useful for vegetable export base), 10% efficient Chlorpyrifos (cis-cypermethrin); stomach-based agents are: hit (15% indoxacarb SC), depletion (10% chlorfenapyr SC), content (24% methoxyfenozide SC), Moth (0.15% methamphetamine, 10 million PIB/ml 苜 silver night nuclear SE) and a vitamin salt series products.
The second is to use the quasi-drug. The newly hatched larvae of beet armyworm are harmful to the susceptibility of the medicinal agents. They are suitable for centralized annihilation treatment, and they are scattered at the third age, the resistance is improved, and the difficulty of prevention is increased. Therefore, it is very important to have proper control timing. At the same time, beet armyworm has the habit of crouching and dying, and hiding in the soil gap, plant base or heart leaf during strong daytime illumination. If the drug is selected for feeding in the early morning or evening pest activity, it can be improved. The probability of taking medicine and improving the prevention and treatment effect, especially when using the contact-killing agent, should pay more attention to selecting the appropriate medication time, which is an important factor that directly affects the application effect.
The third is to use good medicine. Some of the existing good dosages for controlling beet armyworm are less, ranging from a few milliliters to several tens of milliliters. Direct dispensing with water often results in uneven distribution of the concentration of the liquid, and it is preferred to prepare the mother liquor with water before use. Then add enough water to dilute to the desired concentration and evenly spray. In the spraying process, try to avoid the fake death habit of beet armyworm, and the spray pressure will cause it to escape and directly affect its drug-receiving effect. For waxes such as cabbage and broccoli. It is best to add a small amount of neutral detergent powder to the crop to improve the wet spreading performance of the liquid and better ensure the application effect.
In short, for the control of beet armyworm, it is necessary to consider the selection and application of the agent in combination with the stage of the pest at that time, the level of resistance, the type of crop, the density of planting, etc., ignoring any one of these factors may be half the effort.
Author: Chengkang Long
From: Pesticide technology
mailbox:
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