How to control the wax powder scale?

Wax powder scale is an insect of the family Coccidae of Homoptera. In addition to citrus, there are grapes, longan, litchi, yellow peel, avocado, litchi, jujube, tea, mulberry and so on. Nymphs and adults suck the juice of branches and leaves. Heavy leaves dry and curl, weaken the tree potential and even die, causing fruit trees to wither and drop fruit, affecting economic value. Let's take a look at what pesticides wax powder scale uses.

Living habits of wax mealy scale

There are 5-6 generations in South China, with nymphs and female adults overwintering in the skin seams of branches and rolled leaves. The activity began in February of the following year and laid eggs in the oocyst in late March. Each female could lay 200 eggs and 500 eggs. After hatching, the nymph gradually dispersed and transferred to damage. The nymphs of each generation were in the first ten days of April, the middle of May, the middle of July, the middle of September, the first ten days of October and the middle of November. The population density was the highest from April to May and from September to November, and the generations overlapped. The number of male worms is generally very small, mainly parthenogenetic.

Damage characteristics of wax mealy scale

Wax mealy scale occurs for 5 to 6 generations a year in Guangzhou, overwintering with nymphs and adults in cracks or caves in tree trunks and branches and rolled leaves. The activity began at the beginning of February, mainly harming spring shoots, and the first generation oocysts appeared around the end of March. Nymphs and female adults were more harmful to young shoots, fruit stalks and pedicels, followed by petioles and branchlets. Among them, the first and second generation adults and nymphs are mainly harmful to fruits, and the third to sixth generations are mainly harmful to autumn shoots. The insect population density was the highest from April to May and October to November.

How to control the wax powder scale?

1. Agricultural control: strengthen orchard cultivation management, combined with longan flower and fruit thinning in spring and pruning from fruit harvest to spring shoot sprouting, cut off overdense branches and insect-bearing branches, concentrate and burn them, make the crown ventilated and transparent, reduce humidity, reduce insect sources and reduce harm. At the same time, controlling the winter shoot emergence of longan can not only prevent the massive consumption of tree nutrients, affect the flowering and fruiting of the following year, but also interrupt the food source of pests, thus reducing the population base.

2. Biological control: raising pheasants in the orchard can artificially brush off the pests on longan trees during the adult and nymph stages, so that the chickens can eat them, and when they are frightened, they often jump to the ground and become good bait for chickens, and the peak period of adult Eclosion can be caught by nets. At the same time, attention should be paid to the protection and utilization of predatory and parasitic natural enemies, rational use of drugs, and no use of pesticides that do great harm to natural enemies.

3. Chemical control: according to the characteristics that white moth, wax cicada and wax powder scale have no wax powder and secretion before feeding and are sensitive to pesticides, we should grasp the peak period of newly hatched nymphs and spray them at the right time. The focal point of the control of wax powder scale is in the spring shoot period, 80% dichlorvos 1000 times liquid or 90% crystal trichlorfon 1000 times liquid plus 0.2% washing powder, once every 5-7 days, a total of 2 times, or 48% Lesbon EC 1000 times liquid, 18% insecticidal double water agent 1000 times liquid or 50% insecticidal single wettable powder solution 1000 times solution can also be selected for control.