White mussel (UImus pumila L.) Alias ​​furniture, eucalyptus and so on. Deciduous trees shrubs in poorly-grown land. Branches develop, branchlets gray. Leaves oval-ovate or elliptic-lanceolate. From March to April, the leaves first bloomed, and they both flowered and clustered. From April to June, the fruit is ripe, and the samara is nearly round or obovate round, yellow-white when cooked, and no hair.
There are several types of white stork, green leaflets and weeping twigs are commonly used in greenery. The branches of the weeping branches are slightly curved, the main trunk is not obvious, the crowns are umbrella-shaped, the bark is grayish, and the branches are 2-3 years old. Adaptable, faster growth.
The White Pelican is a pioneering species of urban greening developed in recent years. Fast growth, good material, wide distribution, strong adaptability, easy to shape. Due to its extensive use of urban afforestation, especially in cities in the northeast, its insect pests are severe. In order to better control the occurrence and development of the white plague, the main pests and their control methods are described below.
1 Ambrosttnna quadriimpressum Motsch.: Adult fins have purple-red stripes. 1 generation occurred in 1 year. Adults live in the soil for winter, and leaves in late spring sprout. The females began to spawn on the branchlets and later on the leaves. The eggs were hatched as larvae after 5 to 7 days. The larvae appeared in large numbers between May and June. After 20 to 30 days of aging, the earthworms ran into earthworms. The old generation of adults was also under the trees this summer. In August, the newly emerged adults and the summer old adults were attacked by the trees until the adults fell into the trees in late October. Larvae and adults are all harmful to the leaves, and all the leaves are often eaten up when they happen.
There are also Galerucella aenescens Fair. and G. maculicollis Motsch.
Control methods: (1) When adults enter the tree in early spring, they are shaken and killed before the adults lay eggs. (2) Spray 90% of trichlorfon 800-1000 times to kill larvae and adults.
2 Cerato orientalis Motsch.: 1 generation in 1 year. In mid- and late April, adults were unearthed, in June they were spawning seasons, and in mid-June, larvae were hatched. In mid-to late-August, mature larvae were larvae. After about 10 days, they were adultated and the adults passed winter. Adults like to eat young leaves and young buds, lurking at night and in the morning, cluster damage in the afternoon, and most of them appear in warm and windless weather.
Control methods: (1) In the emergence period of adult, it can shock and kill and set light trapping. (2) 50% dichlorvos emulsion 800 to 1000 times liquid poisoning.
3 Phalera fuscescens Butler.: 1 generation in 1 year, adult in 6 to 7 months, lurking during the day and nocturnal activity. Eggs are produced under the leaves, often hundreds of granules are concentrated in a single layer, about two weeks of incubation, larvae more clustered on the leaves, day and night feeding. From August to September, the most serious damage occurred. When the disease occurred, the leaves could be eaten completely and cause 2 leaves. In September, the larvae are old and mature. Overwintering.
Prevention methods: (1) After the fall, dug around the trunk around the earth. (2) Use the habit of spinning and landing the larvae when they are frightened. Shake the trunk and kill the larvae. (3) In the larval colony, spray 90% trichlorfon 800 to 1000 times to kill larvae. (4) Adults have weak phototaxis and can be trapped by light at night.
4 Aromatic wood-capped moth: Adult moths are larger moths with grayish-brown body color and slightly darker abdomen. The back of the head and chest are yellow on the back and there are many dark and dark stripes on the wings. The eggs are nearly white at the time of first production, dark brown before hatching, nearly ovoid, about 1.5mm long, about 1.0mm wide, and the middle and lower parts are often deformed due to the mutual extrusion of eggs, the egg form has vertical ridges, and the ridges have transverse lines. Pattern. The larvae of the mature larvae are red or purplish on the back, shiny, yellowish or reddish on the ventral surface. The larvae enter the soil and the old mature larvae enter the earth. Nocturnal adult activity, phototaxis is weak, likes spawning bark lacerations, 1 ~ 1.5m high egg concentration, each egg 50 ~ 60.
Control methods: (1) Cultivate strong seedlings, strengthen forest management, and prevent humans and animals from harming. (2) The trunk is sprayed with 50% fenthion 400-500 times from late April to late July and sprayed once every 15 to 20 days for a total of 2 or 3 times to kill the newly hatched larvae. (3) During the period of larvae major damage, 25 to 50 times of 40% dimethoate emulsion was injected into the wormholes and injected until the liquid began to overflow. Then the wormholes were closed with yellow mud. The wormhole still has worm activity and refills.
5 Adult white larvae (Lvela ochropoda Ever.) are pure white and have no spots, similar to the young tussock moth but smaller in size and more rounded in the wing tip. For the first time, it is orange and yellow. Adults have emerged from July to August. The larvae do not under the tree during the day and eat it day and night. 1st and 2nd generations, 6th to 7th months are the first generation of adults, and 8th to 9th months are the second generation of adult emergence periods.
Control methods: (1) Sawn trunk or placing planks, tiles or weeds at the dry base to trap and kill larvae and reduce damage. (2) Use blacklight to trap adult insects. (3) 90% trichlorfon was sprayed to kill 5 to 6 instar larvae by 1500 times, and 50% dibromophosphoric emulsion or 50% killer pine emulsion was sprayed by 800 to 1000 times to kill 3 to 4 instar larvae. (4) Kill the larvae with Bacillus thuringiensis or Bacillus sp. 500 to 800 times.
In the prevention and control of pests, the prevention should be based on prevention. Chemical control has caused environmental pollution because of the residues of its phytotoxicity. Therefore, its biological control measures have received increasing attention. It can be used to prevent and control physics and natural enemies of major pests. It is economical and environmentally friendly. It is the best method for green pest control promoted in modern times and should be vigorously promoted and fully implemented.
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