Control of Diseases and Pests of Cortex phel

Disease

Rust harms leaves. It occurred in the middle of May and the harm was serious from June to July. The pathogen is a kind of basidiomycetes in fungi. 20% of verapamil is available. Spray 200-400 times EC, once every 10-15 days, 2-3 times a year, the control effect is good.

Rhizoctonia solani harms seedlings, rotting seeds before emergence, stem base rot after emergence, ring-shaped upward development, constriction and death, still erect, belonging to semi-known subphylum, too dense planting, too much nitrogen fertilizer, too much soil moisture, heavy stickiness. Prevention and treatment: Fumishuang, carbendazim seed dressing, early stage of seedling disease, Jinggangmycin, carbendazim control.

Angular spot disease harms leaves. The pathogen belongs to semi-knowing subphylum. It had a great impact on young trees, which occurred in Sichuan in July and flourished from August to October. At this time, Rain Water often suffered from serious illness. Control: strengthen management, clean up diseased leaves, spray with methyl topiramate, carbendazim and chlorothalonil once every 15 days, the disease mixed with rust, and control together with rust.

Brown spot harms leaves. The pathogen belongs to semi-knowing subphylum. It occurred in Sichuan in July and flourished from August to September. At this time, Rain Water often suffered from serious illness. Control: strengthen management, clean up diseased leaves, spray with methyl topiramate, carbendazim and chlorothalonil once every 15 days, the disease mixed with rust, and control together with rust.

White mildew harms leaves, the pathogen belongs to semi-known subphylum, sporadic, mild, from July to September, high incidence in August, generally do not need special control, such as prevention and control of reference angular spot.

The plaster disease harms the trunk and branches, and the fungus belongs to the subphylum basidiomycetes, sporadically occurs, the harm is not serious, the tree potential is weak, hidden forests are common, prevention and control: scraping, cutting and destruction, Bordeaux liquid and carbendazim control.

Bituminous coal disease harms leaves, and the pathogen belongs to the subphylum ascomycetes, which is a common ecophyte and lives on heterotrophic secretions of wood lice and aphids. Control methods: do a good job in the control of wood lice and aphids, and methyl topiramine and stone sulfur mixture can be used to control them.

Powdery mildew harms leaves, the pathogen belongs to semi-known subphylum, the sporadic harm of the disease is very light, but it can not be prevented and treated with triadimefon and stone sulfur mixture in nursery.

The disease is widespread and sporadic. The pathogen overwintered in the remnant and was transmitted by Rain Water. It occurred from June to August and was serious from August to October. Prevention and treatment methods: elimination of residue, treatment of brown spot at the same time, prevention and treatment of carbendazim and methyl topiramate.

Insect pest

Aphids are pests of piercing and sucking mouthparts, often clustered in leaves, tender stems, flower buds, terminal buds and other parts, sucking juice, making leaves wrinkled, curled and deformed, causing branches and leaves to wither seriously and occur frequently in spring and summer. Control methods: protect natural enemies, use acetamiprid, imidacloprid, imidacloprid and aldicarb at seedling stage; organophosphorus such as dichlorvos, phoxim, malathion, chlorpyrifos, etc.; pyrethroids pesticides such as cypermethrin, fenvalerate, cypermethrin, etc.

Slugs are often harmful at the seedling stage, licking leaves, stems and buds. Prevention and control methods: melon peel or vegetables can be trapped and killed in the occurrence period, or fresh lime powder can be sprayed in the morning and evening.

Small tigers and yellow tigers endanger the seedlings and bite off the young stems from mid-April to mid-May. Prevention and control methods: can be killed in the early morning or heap grass rust.

Citrus (Zanthoxylum bungeanum) Phoenix butterfly larvae begin to occur when the seedling height is 20-25 cm and bite the leaves. After being killed, the leaves are incomplete. Control method: it can be captured manually or sprayed with 800 times of 90% trichlorfon solution for 2-3 times in a row during the larval infancy.

The larvae of the diamondback moth bite on the leaves, which is less harmful to sporadic occurrence. The small cocoon wasp is its natural enemy. Prevention and control: can not control, protect natural enemies, with BT, Beauveria bassiana preparation, or in the larval stage, spray 90% trichlorfon 800x liquid, dichlorvos, pyrethroids, etc., continuous control for 2-3 times.

Insect oyster scale colonies inhabit the epidermis of the trunk and branches of Phellodendron Phellodendri and suck sap, resulting in plant dysplasia. Prevention and treatment: spray 16-18 times turpentine mixture or 150 times methophos emulsion or 20-25 times engine oil emulsion in April, June and July.

Sangbai Shield scale harms tree trunks and branches, sucks juice, white flocs are covered in the harmful parts, Coccinellidae, control: prevent insect seedlings, increase ventilation and light transmission, brush off insect bodies with bamboo in winter, spray with stone-sulfur mixture, and control with imidacloprid and dimethoate in spring.

Citrus planthopper harms leaves, tender shoots and sucks juice. it is a pest of Phellodendraceae, which mainly harms citrus. Phellodendron Phellodendri is an important parasitic plant, which mainly harms the tender shoots of Phellodendron Phellodendron. Prevention and control: prevent the introduction of insect sources, prune insect branches and burn them, and control them with imidacloprid, dimethoate and dichlorvos.

Leafhopper harms leaves, tender shoots, Cicadellidae, sucks sap, makes leaves lose green, leaves fall in a large area seriously, tree potential becomes weak, winter in withered leaves, occurrence of many generations, wide damage, is the main pest, has a great impact on young trees, July-September is the peak period. Prevention and control: do a good job in nursery and young tree control, before the outbreak, once every 10-15 days, imidacloprid, deltamethrin, dimethoate, dichlorvos control.

The longicorn beetle is a generation every year, which is active during the day, and the larvae eat the cortex and xylem, and yellow debris is often excreted outside the wormhole. The insect is often damaged at the base and root of the trunk of the adult tree, and when the bark is eaten once, it destroys the nutrient and water transport of the tree, which leads to the decline of the tree potential, and the heavy ones cause the phenomenon of "enclosing the head" or the death of the whole tree. Prevention and control methods: 1. Strengthen the management of medicinal forest to make the plant grow vigorously and keep the trunk smooth so as to reduce the oviposition of longicorn beetles. two。 Catch and kill adults, master the peak period of adult activities, and organize manual hunting and killing. 3. In order to remove eggs and newly hatched larvae, pay attention to check the parts where longicorn beetles are easy to lay eggs and the newly hatched larvae are harmful, and then chisel off the eggs with a sharp knife. In the initial stage of larvae, pay attention to pick the soil and bright pockets, check the faeces of worms of longicorn beetles, and eliminate the larvae in the early stage of subcutaneous damage. 4. Hook and poison the larvae with drugs. Check the trees before and after the Autumn Equinox and Qingming. If there are insect chips and feces, steel wire hooks can be used to kill larvae. For longicorn beetle larvae with deep xylem, lead strips can be made into cones, wrapped with small cotton balls on the tip, dipped in 80% dichlorvos EC, or 40% dimethoate EC 5-10 times, stuffed into wormholes. The above medicament can also be mixed into 200 times liquid, injecting human wormhole with syringe, and then sealing the hole of wormway with poisonous mud, which can effectively destroy larvae.

Brown longicorn beetles are active during the day every 2-3 years, which is harmful to longicorn beetles, but it can also harm lateral branches, so some lateral branches can be subtracted to reduce the harm. Prevention and control method: like the star longicorn beetle.