The eucalyptus belongs to the family Papilionaceae and eucalyptus. It is also called the doctor tree and lantern tree. Deciduous trees. Native to northern and central China. The trees are well-shaped and their branches are dense and beautiful. The spring leaves are mostly red leaves, and the summer is full of yellow trees. They turn yellow in autumn leaves and become yellow. The fruits are purple and resemble lanterns and are very beautiful. In addition, eucalyptus can also be used to make tannin extracts, flowers can be used as yellow dyes, and seeds can be pressed. The eucalyptus has strong adaptability and obvious seasons. The spring foliage, the summer flower, and the autumn and winter fruit have been used as the Tingyin tree, the street tree, and the garden landscape tree. At the same time, it is also used as the residential area, the factory area and the greening tree species next to the village. Eucalyptus is also a very good soil and water conservation and barren mountain afforestation tree species, it is an ideal green tree species.
The main insect pests of eucalyptus are eucalyptus Japanese wax worms, eucalyptus maggots, and six-star black spotted magpies.
Eucalyptus Japan
Eucalyptus Japan Kikushi wax belongs to the order Homoptera, Waxaceae, and it is known as jujube-blossom, commonly known as jujube. When a large area of ​​the banyan tree occurs, the entire branch is full of insects. The females on the branches are seen as snowing. The nymphs suck sap on the leaves and the excrement covers the entire tree, causing the tree to weaken. , also seriously affected the green landscape.
One year after the worm, it is wintering on the twigs of dense female and adult fertile females. The eggs are produced under the females. Each female can lay 1500 to 2000 eggs. The females of the overwintering period begin to feed in March and April. In mid- and late April, the parasites rapidly increased, and spawning began in mid- and late May. The egg period lasted 25 to 30 days. The nymphs began to occur in late June, and the newly hatched nymphs rested under the shell of the females. After a few days, they spread out and climbed to the sides of the leaf veins of the leaves. After a few days, they secrete wax, form a shell, and remain stationary. After maturation, the females move back from the leaves to the branches and mate with the males. After that, the females fix the overwintering on the branches. The male nymphs began to phlegm in the middle or early August, and after about 15 days in the flood season, they fell into adults, males, and females in late August and early September. After the male nymphs mate, the male worm died, and the females died.
Prevention
1. During the nymphal stage, spray 2000 times of the mixture of sprayed levoblast and 1000 times of detergent, spray 2 to 3 times, interval 7 to 10 days. Using 25% carbofuran wettable powder 200 to 300 times in May to irrigate 2 times, it works well for killing nymphs.
2. From November to March of the following year, the overwintering adult females can be scraped off, and the insects can be scraped off and buried deep in the plastic bag. With pruning, the insects can be cut off. To fight ice-wings to eliminate overwintering female adults, in the winter season in the event of rain and snow weather, there is a thick ice cream on the branches, in time to beat the branches shake off the ice, you can overwintering insects with the ice-collapse, to deal with the falling ice cream.
Eucalyptus aphid
The eucalyptus borers are Homoptera and Polygonaceae. They mainly damage the young shoots, tender buds and young leaves of eucalyptus. In severe cases, the twigs are full of worms. The secretions cause the trunk to be wet and wet like rain. Affecting the growth of branches, causing the tree vigor to weaken, and even causing death of trees.
For several generations of the year, the eggs were used for budding and wintering in the cracks in the bark. In the first April of the following year, when the banyan tree just sprouted, the wintering eggs hatched as Ruojiao. At this time, they mostly inhabit at the bud seam, similar to the color of the tree buds. In mid-April, the formation of wingless females began to produce small beetles. In late April, a large number of winged beaks emerged. They migrated to fly and spread, and the population of insects increased greatly. From late April to May, the damage was most severe. Shoots were tender and shoots were full. Worm body, sucking tree nutrients, bending branches of victims, leaf curling, shed urine on branches, trunks, and ground, affecting tree growth and environmental sanitation; In the middle and late part of the month, the winged plover migrated back to eucalyptus, and a large number of small worms were born. After a certain period of time, a winged male and a female with no wing were born. After wintering, they lay eggs.
Prevention
1. Trees with more than one winter worm eggs spray 30 times the No. 20 oil emulsion before germinating the trees in early spring. In early April at the beginning of the incubating period in Ruoqiang, it was sprayed with 2000 times solution or 10% imidacloprid 2000 times solution.
2. In the early stage of hair growth, the severed infested shoots on the tree trunk were promptly cut off, and the aphids that had not spread initially were eliminated. Pay attention to protect and use natural enemies such as ladybugs and grasshoppers.
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