During the growth process of citrus, there is a class of harmful pests, scale insects, of which the most common are fleas. It breeds quickly and has overlapping generational hazards. Because of the parasite's waxiness, the control effect of general pesticides is not ideal. The damaged citrus trees are weak, the leaves yellow and fall off, the new shoots are easy to die, the fruit setting rate is not high, the yield is decreased, and the fruit quality is low . The locusts prefer the warm and humid environment. Generally, there are three peaks of damage in early May, mid-July and early October. Prevention measures are:
Biological control
The natural enemies of S. axyridis mainly include ladybugs, parasitic bees, and parasites, such as red ring ladybug, red dot ladybug, australian ladybug, red ladybug, golden bee bee, and soft beetle wasp. In the prevention and treatment, we must pay attention to the protection of natural enemies.
Chemical control
Grasping the appropriate time for prevention and control is due to the sensitivity of first- and second-instar females to males and males of first-instar males and females to pesticides. This is the weak link of scale insects, and it is also the best effective period for the prevention and treatment of spinosad. . Among them, 11 to 12 months after the harvest of citrus is one of the best period for prevention and control. We must do a good job of prevention and control. If the best is suitable for a period of time, we should try to pay close attention to spraying after picking fruit.
Selecting the right pesticide and the appropriate application concentration of the pesticides with higher control effect on citrus spinosad have the following kinds: The first is to kill phosphorus. 40% of the anti-phosphorus 1000 ~ 1500 times liquid on the control effect of pups up to 98%, and can kill into the eel. The second is a pineine mixture. It is made of 3 parts of rosin, 2 parts of caustic soda and 10 parts of water mixed together. It is strongly alkaline and has strong penetrating power. It has a corrosive effect on the oyster shell of A. spinosa. Use a concentration of 20 to 30 times. Be careful not to mix with any other pesticides and not overdosage in one part. The third is mineral oil. Oil emulsion with 50 to 100 times the liquid, the prevention and control of young cubs, control effectiveness of more than 95%; with 30 times the oil emulsion prevention and treatment of adult lice and old age, control effectiveness of more than 95%. Fourth, mixed drugs. The use of organophosphorus pesticides and oil emulsions alone can increase efficiency by 2 to 5 times. The use of a low concentration oil emulsion (2%) in combination with a low concentration of organophosphorus pesticides 2500-3000 times or 100-200 times the bitter buckwheat emulsion can achieve a control effect of more than 90% for the tinea capitis females.
To ensure the quality of spraying when applying pesticides, care must be taken to ensure that the inside and outside of the crown, up and down, and both sides of the blade are sprayed. In the orange groves where pests are particularly severe, it is best to spray pesticides after trimming. Generally, 100 kilograms of medicinal liquid should be sprayed per mu for an adult orange grove. In orange groves with severely weakened or severely damaged pests, slight defoliation may occur after spraying, and the use concentration should be appropriately reduced. If there is rain within 48 hours after spraying, it must be sprayed in time.
Lung Function Meter Filter,Medical Spirometry Filter,Spirometry Bacterial Filter,Disposable Lung Function Meter Filter
Hengshui Qifei Paper Products Co. LTD , https://www.hengshuiqifei.com