Harmless vegetables are those that contain no toxic substances that are not allowed in the regulations. For some unavoidable harmful substances, such as pesticide residues, nitrates, and other harmful substances, they must meet the allowable content range of commercial vegetables.
First, the incidence and damage of vegetable worms on vegetables, locusts with adults, nymphs gathered in the leaves of the injured plant leaves, young leaves, young stems and growth points, etc., sucked juice, resulting in leaf curling, young leaves forming folds, deformities . When the damage is severe, the growth and development of the plant is retarded or even stagnated, which has a great influence on the yield and quality of the vegetables. At the same time, maggots are also communicators of viral diseases.
Second, prevention and control measures
1, agricultural control. First, we must timely tillage, remove debris and weeds in the field, and promptly remove the dead leaves, reduce the source of aphids; Second, according to the migration of the winged dragonfly phototaxis, can be coated with adhesive material or oil yellow plate Inducing hunting and killing can also be avoided by covering the ground with silver-gray mulching film. Third, rational fertilization is required. The locust prefers carbohydrates. During the cultivation of vegetables, it is necessary to use more rotten manure, and less use of chemical fertilizers.
2, biological control. Full use of natural enemies to eliminate aphids, aphids of many natural enemies, mainly ladybugs, flies, grasshoppers, mold and other mold. When the locust infestation achieves the prevention and control index, when the medicine is needed, it should also be used in the affected part of the plant, such as the growing point of the plant, young leaves, young stems, etc.;
3, the rational selection of pesticides. Practice has proved that the current control effect is relatively good, and in line with the state of pollution-free vegetable production requirements of the pesticide species are: fast kill Ling, punnet, dermatophyte, trichlorfon and so on. Different pesticide species have specific control objects. When we conduct the prevention and control, we must select the appropriate pesticide species, use the correct method and concentration, and not use pesticides that are prohibited by the state on vegetables.
4, rational use of pesticide rotation. Aphids have the characteristics of rapid propagation and many generational occurrences. Long-term use of a pesticide can easily produce drug resistance. Any type of pesticide that cures leeches can generally only be used twice in the same place, and should be used interchangeably. This can prevent maggots from developing resistance to drugs and achieve the purpose of less medication and high benefits.
First, the incidence and damage of vegetable worms on vegetables, locusts with adults, nymphs gathered in the leaves of the injured plant leaves, young leaves, young stems and growth points, etc., sucked juice, resulting in leaf curling, young leaves forming folds, deformities . When the damage is severe, the growth and development of the plant is retarded or even stagnated, which has a great influence on the yield and quality of the vegetables. At the same time, maggots are also communicators of viral diseases.
Second, prevention and control measures
1, agricultural control. First, we must timely tillage, remove debris and weeds in the field, and promptly remove the dead leaves, reduce the source of aphids; Second, according to the migration of the winged dragonfly phototaxis, can be coated with adhesive material or oil yellow plate Inducing hunting and killing can also be avoided by covering the ground with silver-gray mulching film. Third, rational fertilization is required. The locust prefers carbohydrates. During the cultivation of vegetables, it is necessary to use more rotten manure, and less use of chemical fertilizers.
2, biological control. Full use of natural enemies to eliminate aphids, aphids of many natural enemies, mainly ladybugs, flies, grasshoppers, mold and other mold. When the locust infestation achieves the prevention and control index, when the medicine is needed, it should also be used in the affected part of the plant, such as the growing point of the plant, young leaves, young stems, etc.;
3, the rational selection of pesticides. Practice has proved that the current control effect is relatively good, and in line with the state of pollution-free vegetable production requirements of the pesticide species are: fast kill Ling, punnet, dermatophyte, trichlorfon and so on. Different pesticide species have specific control objects. When we conduct the prevention and control, we must select the appropriate pesticide species, use the correct method and concentration, and not use pesticides that are prohibited by the state on vegetables.
4, rational use of pesticide rotation. Aphids have the characteristics of rapid propagation and many generational occurrences. Long-term use of a pesticide can easily produce drug resistance. Any type of pesticide that cures leeches can generally only be used twice in the same place, and should be used interchangeably. This can prevent maggots from developing resistance to drugs and achieve the purpose of less medication and high benefits.
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