Morphological characteristics The life cycle of greenhouse whitefly can be divided into four stages: eggs, nymphs, mites, adults, and its formation time is: white powder å¯ can produce 9 to 10 generations a year, one generation 30 days or so, one can lay 100 eggs at a time . The eggs are yellowish brown, goose-oval, scattered on the back of the leaves. If the nymph's body is elliptical, the first-instar larvae that are hatching will crawl to find the proper position, and then fix it on the back of the leaf, and the mouthpiece will penetrate into the plant to suck. The adult body is covered with a layer of white wax, which uses its sucking mouthparts to absorb plant juice.
In the case of nymphs and adults in the growth of symptoms, the large amount of plant sap will cause the leaves to fade, curl, and shrink. The secretion of nymphs often induces plant mildew and causes the leaves to be covered with a layer of black mold, which leads to normal photosynthesis and respiration of the leaves. The effect is disturbed and the plant is weak and dead. In addition, whitefly is often the media of viral diseases.
Comprehensive prevention and control 1. Prevention and control of small remedies (1) In the initial stage of trapping and avoiding whitefly, a square plate of 30-40 cm can be set in the greenhouse, and the No. 10 motor oil is applied on the line between the rows and the plants are higher than the vegetable plants, and the adult is trapped. Wipe and replace when the oil is not sticky. In the winter and spring, the aluminum plated reflective curtain is placed in the greenhouse in combination with the yellow plate to repel the whitefly and increase the illumination of the plant. (2) Tobacco has the functions of stomach poisoning, contact killing and fumigation, which can kill the nerve paralysis of pests. Because of its strong penetrating power, it also has certain insecticidal effects. Put the tobacco leaves and petioles into the container, soak in water for a day and night, spray and spray, to prevent white powder from becoming worms, and the effect is very good. (3) Washing powder washing powder has a strong contact effect on pests. The washing powder solution can alleviate the waxy layer of the white powder carcass and penetrate into the insect body to block the stomata of the pest body and cause suffocation to die. The dosage is 600-800. Times. (4) Soap water is cut into thin slices by soap, and opened with hot water. Water is added in a ratio of 1:60 to 70. After cooling, it can be sprayed, and smoke water can also be added, which can obviously improve the control effect on whitefly.
2. Chemical control (1) Smoke killing method is generally applicable to closed greenhouses, taking smoked agents such as 25% cockroaches once again, dropping 5-8 drops of 80% dichlorvos on the igniting material, then igniting, smoking Killing about 4 hours to release the wind, the effect is very good. In addition, if used continuously, it can also take 2-3 drops of Uranus or Uranus (component of bifenthrin), and fumigation on the burning material, the effect is very good, continuous 3 to 4 times, can completely eliminate the greenhouse whitefly. (2) Pharmacy control 25% Aketai water dispersible granules 4000 times, effective in two days; 25% phlegm WP 2,000 times to kill eggs; 10% cover 10,000 times; 10% high efficiency gongchen WP 1000 Double; 40% speed to kill 800 times.
3. Comprehensive prevention and control In view of the large number of greenhouse whitefly, rapid breeding, and great damage, according to the local specific situation, the principle of “combination of physical methods and chemical methods, killing adults and killing eggs†can be adopted. There is a better control effect. The following is a good formula for the prevention and control of whitefly: (1) 5% of chlorpyrifos 2000 times plus imidacloprid (20% è™± å® ã€, 25% è™± è™± 1500 times, 5% high efficiency 1500 times). (2) 40% speed smash 800 times plus 25% è™± è™± 2000 times. (3) 60-80 times of tobacco water plus 25% of sputum. (4) 60-80 times of tobacco water plus 4000% of Akte. (5) 20% è™± å® 1000 1000 times plus 2.5% Uranus 3300 times (10% cover 10,000 times).
As a greenhouse parasite, the greenhouse whitefly is a long-term damage and serious damage. Therefore, the pest must be scratched, tightly guarded, planned, and applied in a step-by-step manner. Never wait until the greenhouse whitefly reaches a certain amount before starting prevention. Preventing problems before they happen, and sticking to them from beginning to end, can achieve good control results.
Source: Rural Volkswagen
In the case of nymphs and adults in the growth of symptoms, the large amount of plant sap will cause the leaves to fade, curl, and shrink. The secretion of nymphs often induces plant mildew and causes the leaves to be covered with a layer of black mold, which leads to normal photosynthesis and respiration of the leaves. The effect is disturbed and the plant is weak and dead. In addition, whitefly is often the media of viral diseases.
Comprehensive prevention and control 1. Prevention and control of small remedies (1) In the initial stage of trapping and avoiding whitefly, a square plate of 30-40 cm can be set in the greenhouse, and the No. 10 motor oil is applied on the line between the rows and the plants are higher than the vegetable plants, and the adult is trapped. Wipe and replace when the oil is not sticky. In the winter and spring, the aluminum plated reflective curtain is placed in the greenhouse in combination with the yellow plate to repel the whitefly and increase the illumination of the plant. (2) Tobacco has the functions of stomach poisoning, contact killing and fumigation, which can kill the nerve paralysis of pests. Because of its strong penetrating power, it also has certain insecticidal effects. Put the tobacco leaves and petioles into the container, soak in water for a day and night, spray and spray, to prevent white powder from becoming worms, and the effect is very good. (3) Washing powder washing powder has a strong contact effect on pests. The washing powder solution can alleviate the waxy layer of the white powder carcass and penetrate into the insect body to block the stomata of the pest body and cause suffocation to die. The dosage is 600-800. Times. (4) Soap water is cut into thin slices by soap, and opened with hot water. Water is added in a ratio of 1:60 to 70. After cooling, it can be sprayed, and smoke water can also be added, which can obviously improve the control effect on whitefly.
2. Chemical control (1) Smoke killing method is generally applicable to closed greenhouses, taking smoked agents such as 25% cockroaches once again, dropping 5-8 drops of 80% dichlorvos on the igniting material, then igniting, smoking Killing about 4 hours to release the wind, the effect is very good. In addition, if used continuously, it can also take 2-3 drops of Uranus or Uranus (component of bifenthrin), and fumigation on the burning material, the effect is very good, continuous 3 to 4 times, can completely eliminate the greenhouse whitefly. (2) Pharmacy control 25% Aketai water dispersible granules 4000 times, effective in two days; 25% phlegm WP 2,000 times to kill eggs; 10% cover 10,000 times; 10% high efficiency gongchen WP 1000 Double; 40% speed to kill 800 times.
3. Comprehensive prevention and control In view of the large number of greenhouse whitefly, rapid breeding, and great damage, according to the local specific situation, the principle of “combination of physical methods and chemical methods, killing adults and killing eggs†can be adopted. There is a better control effect. The following is a good formula for the prevention and control of whitefly: (1) 5% of chlorpyrifos 2000 times plus imidacloprid (20% è™± å® ã€, 25% è™± è™± 1500 times, 5% high efficiency 1500 times). (2) 40% speed smash 800 times plus 25% è™± è™± 2000 times. (3) 60-80 times of tobacco water plus 25% of sputum. (4) 60-80 times of tobacco water plus 4000% of Akte. (5) 20% è™± å® 1000 1000 times plus 2.5% Uranus 3300 times (10% cover 10,000 times).
As a greenhouse parasite, the greenhouse whitefly is a long-term damage and serious damage. Therefore, the pest must be scratched, tightly guarded, planned, and applied in a step-by-step manner. Never wait until the greenhouse whitefly reaches a certain amount before starting prevention. Preventing problems before they happen, and sticking to them from beginning to end, can achieve good control results.
Source: Rural Volkswagen
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