Epidemic Prevention and Control Techniques of Italian Poplar
Ulcer disease mainly harms saplings, mostly occurring on the trunk and large branches. The initial symptom was the formation of a circular vesicular lesion on the edge of the trunk lenticels. Afterwards, the lesion gradually expanded and showed an irregular shape. The bubble was filled with brown mucus and the lesion was dark brown around. After the blisters ruptured, scars were left, and later the sagging was dry and easy to peel. When the damage is severe, the disease on the bark is dense and interconnected, causing the plant to die. The disease began in April, with the first peak of onset from May to June, and the second peak of onset from August to September. It gradually slowed and stopped after October. Control methods: Use disease-resistant species, forbid diseased seedlings to nursery, and sterilize the surface asymptomatic seedlings with 0.5% potassium permanganate solution for 10 minutes; use 50% carbendazim WP 500 times or 70 times for seedling disease. The 100% solution of thiophanate-methyl thiophanate-methyl was smeared on the diseased part. Before the application of the drug, a knife was used to engrave crooked wounds in the diseased part. The rust spring poplar shows the malformation buds on the tree covered with yellow powder piles. In Jianhu County, when the temperature rose to 16°C at the end of March and early April, disease sprouts appeared one after another. It took 1 to 2 days earlier than Jian Jian, and dried after about 3 weeks. The time of emergence of disease buds is about 4 weeks, but a large number occurs mainly in the middle and late April, and May-June is the peak of onset. Control methods: Remove the diseased buds in the early spring and put them in bags to prevent the spores from spreading and then spray them with zeslen zinc, Bordeaux mixture, and lime sulfur mixture. After an outbreak occurs, the young fan moth will have eaten leaves in 3 days. Five generations usually occur in one year, the first generation occurs in the middle of May, the second generation occurs in the middle or late June, the third generation occurs in late July to early August, and the fourth generation occurs in late August. The Five Dynasties took place in the middle or late September, with the third and fourth generations having the greatest damage. Prevention and control methods: Aphis gossypii is formed in the third instar before the silkworm leaves, and early worms can kill a large number of larvae; Spray 40% dimethoate (1000 times) and 2.5% deltamethrin on the canopy with a high-range sprayer Emulsifiable concentrate (2500 times) of the mixture or 40% acephate EC 800 to 1000 times; perforated at the base of the trunk and injected with omethoate diluent. The main pupa pest of Sang Tian Niu Yi Yang, the newly hatched larvae invaded the xylem and wormed down into a straight insect path. The larvae bite out a round defecation hole at intervals in the tunnel to make the damaged trees form. Porous, easy to break branches and trees when wind blows. Sangtianni occur every 2 years, larvae in the xylem wintering, in the following year began to phlegm, from July to August emerged as adult fly out, and then in the branches bite "U" shaped groove spawning, larvae After hatching into the xylem hazard. Control methods: choose red poplar, giant buckwheat and other varieties of resistance to Mulberry; search trunks and branches to find grooves, find egg masses, egg flutes, and concentrate destruction; catch adult worms in eclosion period, or use iron wire The larvae are stabbed from the tunnel; fresh excretion holes are inoculated during the damaging period of the mulberries, and dilute solutions such as dichlorvos and omethoate are injected, or cotton pellets of leeches are stuffed in, and then the larvae are sealed with mud. Grasses, grasses, grasses, and grasshoppers In the early spring, trees absorb buds and twigs of poplar trees so that young shoots do not germinate. One year in 1 year, wintering in the soil with eggs, hatching of wintering eggs in early February, nymphs crawling out of trees in the middle and late February, gregarious hiding in tree gaps or tree shrews, etc.; end of March to April Increased, secreted wax; entered the mid-May period of damage; in early June, females laid trees, spawned in weeds and soil, the end of the damage period. Control methods: In the early spring, the nymphs are tied with tape at a height of 1 meter in front of the tree trunk, and a 10 cm wide ring of medicine is put on the upper and lower side of the tape with waste oil and organophosphorus pesticides to prevent the grass from climbing up and down the tree; Fruit and other drugs spray treatment.
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