Whitefly is also known as the white fly, belonging to the family Homoptera. In the late 1970s, following the expansion of greenhouses such as greenhouses, the spread and spread of the insects showed an expanding trend. At present, most areas in China have seizures and hazards, which have become important pests for cultivating vegetables in greenhouses.
Symptoms of whitefly in tomato greenhouse
Living habit
Adults have a strong tendency to yellow, but avoid white, silvery white, not good at soaring. Start a little bit in the field and then gradually spread. The density of insects in the field is unevenly distributed. The adults are clustered on the opposite side of the young leaves of the plants and lay eggs on the young leaves, which are extremely difficult to fall. Following the growth of the plants, the adults continue to move to the upper leaves, so the distribution of the insects on the plants forms a certain rule: the uppermost leaves, the most yellow and yellow eggs, and the lower leaves are mostly dark brown. The eggs are followed by nymphs, nymphs, and baboons.
Harmful feature
Adults and nymphs cluster on the opposite side of the leaves, the mouthparts pierce the mesophyll, pick up the plant juice, form the leaves chlorotic and dry, the fruit deforms rigidly, causing premature senescence of the plants, affecting the yield reduction.
Strong reproduction, rapid reproduction, large population, clustering, can excrete a lot of honey, severely pollute leaves and fruits, often cause a large episode of coal pollution, so that vegetables lose product value.
Harmful crop
Tomatoes, eggplants, sweet peppers, colored peppers, ginseng fruit, physalis, celery, cucumber, kidney beans and other vegetables.
Tomato greenhouse whitefly prevention and control measures
Agricultural control
Cultivate "bug-free seedlings" When seedlings are seeded, the seedbeds are separated from the production greenhouses, and the seedlings before the seedlings are fumigation-sterilized to eliminate the remaining insects; the weeds and residual plants are removed, and nylon yarns or insect nets are added to the vents to prevent invasive insect sources. . Strengthening the management of management combined with pruning, removing old leaves and burning or deep burying can reduce the number of insects. The use of artificially released natural enemies such as Lily wasp, Chinese grasshopper and Verticillium can control whitefly. Using the intense yellowing habit of whitefly, in the early stage of the attack, the yellow plated oil was hung between the vegetable plants to trap the adult.
Chemical control
25% thiazole chlorpyrifos microcapsule suspension (low toxicity) using 480-600 g / ag spray
20% dinotefuran soluble granules (low toxicity) using 30-50 g/mu spray
70% imidacloprid water dispersible granules (low toxicity) using 4-6 g/mu spray
2.5% bifenthrin aqueous emulsion (low toxicity) using 20-40 ml / mu spray
3% acetamiprid microemulsion (low toxicity) using 30-60 ml / mu spray
22% spirochete thiacloprid suspending agent (medium poison) using 30-40 ml / mu spray
10% pyridinium imidacloprid suspension (low toxicity) using 30-50 g/mu spray
10% nitenpyram water (low toxicity) spray with 1500-2500 times
40% chlorothiazide water dispersible granules (low toxicity) using 4-5 g/mu spray
15% Avithiazinone Suspension (Low Toxic) Spray with 1000-1500 times
6% daisy· acetamiprid microemulsion (low toxicity) using 26.25-30 ml/mu spray
22% thiamin and high chlorofluorocapsule suspension-suspending agent (medium toxic) using 5-10 ml/mu spray
25% thiamethoxam water-dispersible granules (low toxicity) use 1) 7-15 g / mu 2) 2000-400 1) seedling period (3-5 days before planting) spray 2) root irrigation
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