Scale insects are a class of important pests on citrus and grapefruit. Commonly, there are red round glutinous rice, brown round glutinous rice, Kang scorpion scorpion, scorpion scorpion and blown stalk. Scale insects damage leaves, shoots and fruits. The scale insects are often male-winged and capable of flying. The females and larvae once emerged and colonize the leaves or fruits for life, causing the leaves to yellow, the branches to wither, the tree to decline, and easy to induce soot. So how do you control the scale insects?
First, the cause of the scale insects:
Climate factors:
The effect of humidity is mainly reflected in the reduced survival rate of scale insects under low humidity conditions. Excessive humidity tends to favor scale insects, rarely causing nymphs to die, and when the humidity is below 15%, the nymphs will die in large numbers, so the drought year is not conducive to the occurrence of scale insects.
Temperature, rainfall and wind have a greater impact on the population of scale insects. For example, it is suitable for living in warm and humid environment. The female adult has the highest temperature when the temperature is 25~26°C, and the spawning is reduced when the humidity is higher. The optimal temperature for the normal activity of the nymph is 22 ~28 ° C, more than 32 ° C began to die, a large number of deaths above 40 ° C or -12 ° C.
Second, the common locust species prevention time:
Grasshopper
The key period of prevention and control: the nymphs are on the tree during the peak period of mid-March.
Sang shield
The key period of prevention and control: the female begins to feed, that is, in the middle and late March and the end of the hatching of each generation, that is, late May and early August.
Pear round
The key period of prevention and control: the wintering insects began to feed, that is, the middle and late March and the wintering nymphs, that is, mid-June.
Kang's whitefly
The key period of prevention and control: during the hatching period of wintering eggs, the germination of pear trees and the nymphs of each generation occur in mid-to-late May, late July and late August.
Japanese wax enamel
The critical period of prevention and control: before the female adult is hatched, that is, in late May and early July of the nymph.
Korean ball
The key period of prevention and control: the mid-March of the wintering nymph shelling activity and the mid-May of the nymph hatching period, at this time, there is no covering on the back of the worm body, and the medicament can exert a better effect.
Third, the control measures of scale insects
1. Strengthen the management of orchard, timely fertilize and irrigate the water, meet the needs of fruit trees for water and fertilizer, and improve the insect resistance of fruit trees.
2, combined with plastic trim, burned with insect branches.
3, grasp the two weak links in the life activities of the scale insects, take physical and mechanical methods, can play a multi-functional effect.
4. In the period of frequent pests, use locusts to spray and quickly kill the existing scale insects.
The beetle has a sharp mouthpart that can be inserted into the leaves, stems, and roots of the flesh to absorb the juice of the flesh, causing the plants to wither. In addition, the shellfish's own secretions can also induce fleshy soot. A scale insect is one of the common pests of plants. It is usually produced by sucking juice on the leaves or stems of plants. In severe cases, it will cause branches to wither or the whole plant to die. Everyone must pay attention to prevention.
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