Main Diseases and Control Techniques of Nectarine

Anthrax

1 symptoms: the main damage to the fruit and tree tops, leaves can also be affected, the fruit surface was flooded green brown spot, after dark brown, gradually shrinking, when the climate is humid, in the lesions give birth to pink small particles, Concentric pattern, sick fruit hang on the branch into a stalemate. When the fruit is inflated, it is also a small stain at the beginning. It gradually expands into a reddish-brown round spot, and grows a small red spot. The fruit is subdivided into stalks, and the fruit falls off or hangs on the branch. At the beginning of the shoot, the victim suffered from water-stained, light-brown lesions, and later became brown. The shape was oblong, with a slightly reddish edge and a slight sag, with pink spots on the surface. Severe branches die. The most diseased leaves on the upper leaves of diseased leaves, often with the main vein as the pumping heart to the front roll into a tube.

2 methods of prevention and control: clean the pastoral, clear the stale fruit and diseased branches, clear the fallen leaves in winter, eliminate the source of the disease. Pay attention to Taoyuan drainage

Chemical control: spray 5 degrees lime sulfur once before germination in early spring to eliminate the source of overwintering disease. After every 10 days after flowering, spray 500 times of 50% thiophanate or 25% carbendazim or 50% efflux Special or Zeson zinc, etc., a total of 3-4 sprays, have a good control effect.

2, peach scab (also known as scab)

1 symptoms: the main harm to the fruit, but also damage the leaves and shoots. Lesions often occur near fruit stems. When the fruit is immature, dark green round spots appear. When it is nearly mature, it becomes black. The damage of the germs occurs only in the skin, the epidermis of the disease area is necrotic, and the pulp continues to grow, resulting in cracking of the diseased fruit. In severe cases, a fruitful result is formed. The onset of leaf disease began at the back of the leaf, and irregular gray-green lesions formed at the beginning. Afterwards, they gradually died and the lesions were detached to form perforations, which can cause serious defoliation. Onset of shoots, the lesion is dark green, uplift, flow plastic, only damage the surface does not penetrate the interior.

2 Prevention methods: Clear garden in autumn, burned diseased leaves to eliminate the source of overwintering. Strengthen the summer trim, be sure to make the tree air and light.

Chemical control: before the budding Baume 3-5 degree lime sulfur agent, after the 4-5 months after the Xiehua, spray 500 times on behalf of Zinc or 600-700 times 70% thiophanate-methyl every 15 days or 8000 times DuPont Fuxing and other agents, even spray 3-4 times.

3, Peach plastic disease

Symptoms: Mainly occur on the main trunk, main branch and large lateral branch, and severe branchlets also occur. After infection, transparent soft gums were secreted from the branches and turned into a dark brown gum after contact with the air. Cause the tree vigor to weaken and die prematurely.

2 control methods: The disease is mainly caused by wounds, lateral buds and lenticels immersed into harm. In the prevention and control can take the following methods to prevent and control.

Strengthen management, increase organic fertilizers, strengthen fertilizer and water management, improve soil physical and chemical properties, increase tree vigor, improve tree resistance, pay attention to Taoyuan drainage, prevent and control pests and diseases, timely prevent and control various pests and diseases, reduce wounds, and reduce invasion sites of bacteria; Whitening, avoiding frostbite, and sunburn causing wounds; Chemical control: Effectively do a good job in winter gardening, spray 5 degrees lime sulfur before sprouting, spray 50% carbendazim 800-1000 times from April, half a month Spray 4 times at a time, spray 0.5% lime sulfur on diseased stems, spray three times in half a month, spray as little as possible on the leaves and green branches, and use insecticides to kill all kinds of peaches. Pests.

(b) Major pests

1, Tao Ye

1 Injury symptoms: mainly larvae eat fruit. One fruit has 1-2 larvae, 8-9 of which are more likely to turn fruit into food. The victim's fruit secreted brown transparent plastic juice from the wormholes, and excreted feces standing around the hole, resulting in reduced fruit production, serious "ten peach nine."

2 Prevention and control methods: timely clear the branches and leaves of peach orchard pests, remove sunflower, corn, sorghum and other crop straws, eliminate overwintering adults. Before the emergence of the first generation of adults in mid-to-late May, the fruit was timely bagged. Chemical control: Spray 50% parathion 2000 times liquid or 90% crystal dipterex 1000 times or 80% dichlorvos emulsion 1500 times or 20% Python emulsion 3,000 times in season of adult emergence. Or 2000 times the sweeping profit and so on.

2. Peach heartworm

1 Injury symptoms: The larvae crawled on the fruit surface for dozens of minutes after hatching, and then licked into the fruit from the crest or shoulders of the young fruit, and pectin flowed out from the fistula cavities and became white waxy after drying. The damaged fruit surface is deformed and the flesh rots and loses its food value.

2 Control methods: The tree cover covers the plastic film. Before the emergence of the adult, it can cover the ground film under the canopy to prevent the emergence of the adults after emergence. Drug control: 200-250 times of the larvae's emergence in the early and late stages from May to July. The water was sprayed on the ground for 2 times with azionphos and parathion. The first-generation egg flourishes (at the end of June and in late July) and sprays 40% water-containing phosphorothiocyanate 1000-1500 times or 20% wipe-off 3000 times.

3, peach weevil (also known as peach tiger)

1 Injury symptoms: Adults bite on flowers and young fruits of peach trees, as well as young shoots, young leaves, and the surface of damaged fruits. The scars are often filled with glue, causing rot and fruit drop. The larvae break into the fruit and harm the fruit, causing the fruit to dry rot. .

2 control methods

A. Kill adult worms, use adult insects, and put plastic sheets under the trees at night. Shake the branches early in the morning to make the adults frightened, fall and concentrate.

B. Elimination of Insects: In combination with fruit thinning, pests are often removed from the trees and picked up on the ground. They are cut to destroy pests.

C. Chemical control: Before the adult is unearthed (at the time of peach sprouting), 75% phoxim emulsion is sprayed on the ground under the tree to poison the adult and larvae in the soil. In the adult stage, spray 90% crystal trichlorfon and 50% phoxim 1000 times or 80% dichlorvos emulsion 1500 times.

4, pink neck beetles

1 Injury symptoms: mainly larvae in the trunk xylem drill curved tunnel, emptying the trunk, the newly hatched larvae under the skin feeding hazards, gradually deep into the xylem, crisscrossed into a criss-crossing insect road, deep in the center of the trunk, up and down to wear, discharge The excrement facilitates the outside of the insect and accumulates around the trunk. The damaged branches of the trunk flow glue, weakening and growing, causing branch branches and even death of the whole tree.

2 control methods:

Adult worms were killed and summer adults emerged. Using their nocturnal resting branch habits, they were caught artificially, and there were many sunny adults after the rain.

The trunk was painted white, white solid agent was applied on the trunk and the base, and the white coating agent was 10 parts of quick lime, 0.2 parts of salt, and 40 parts of water. Adults can be prevented from spawning.

When larvae are poisoned and fresh insects are found, insert an aluminum phosphide poison stick into the worm tract or inject 1 ml per well with a 40% solution of dichlorvos with a syringe, or use cotton to dip the dichlorvos solution into the insect tract, and then stick it. Mud seals, poisoning larvae.

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