Prevention and Control of Leaf shrinkage Disease of Peach

Hot summer is often the time when many diseases occur. Summer is suitable for germs, and it is also very humid in some areas, so before summer comes, we often need to prepare plants to prevent diseases. The editor will introduce to you the peach leaf shrinking disease of summer green peach. Friends who like green peach should not miss it.

Green peach

Fungal diseases. The pathogen overwintered or oversummer as spores on the bark and bud scales, and invaded the leaves in the spring of the following year. The spores were transmitted by airflow and invaded from stomata or upper and lower epidermis. The mycelium of the pathogen spreads under the host epidermis or in the intercellular space of the palisade tissue, which stimulates the host tissue to divide massively, thickens the cell wall, and makes the leaves show the symptom of wrinkling and curling. The disease not only harms the leaves, but also harms the young shoots, flowers and fruits, the susceptible leaves wrinkle and curl, the color changes to reddish brown, the texture of the leaves becomes brittle, and finally the leaves dry and fall off; the internodes of the susceptible shoots become shorter, some swollen, and most of the leaves on the diseased branches are clustered, and in serious cases, the diseased shoots wither and die.

Prevention and treatment methods: in the early stage of the disease, the diseased leaves were removed in time, the damaged branches were cut off, and concentrated destruction was carried out to reduce the source of infection. Timely and reasonable watering and fertilization can enhance the resistance of plants and reduce the occurrence of diseases. Before sprouting peach buds in early spring, spray 3mur5pomedo stone sulfur mixture or 1pur1pur160 Bordeaux solution to prevent bacterial infection. Peach trees are sprayed with 3% copper sulfate after defoliation to kill over-wintering and summer spores.

How to effectively control peach leaf shrinking disease

Peach leaf shrinking disease is commonly known as swollen leaf disease, which mostly occurs in the period of rainy and low temperature in spring, and occurs in peach orchards in various provinces in China. the disease mainly harms peach, green peach, cherry, apricot, plum and so on.

Prevention and control of peach leaf shrinkage disease:

The main results are as follows: 1. Do a good job in soil, fertilizer and water management and improve ventilation and light transmittance. Peach orchards with serious disease should be fertilized and irrigated in time to promote tree potential and enhance disease resistance. Remove the diseased leaves in time and burn the fruit trees in dormancy period. Spray 3-5 Baumedo stone sulfur mixture to eradicate overwintering bacteria.

2. The critical period of prevention and control is when the peach blossom bud is red but not unfolded. The following agents can be sprayed: 5 Baomedu stone sulfur mixture; lvl 1purl 100x Bordeaux solution; 50% sulfur suspension 600x liquid; 10% difenoconazole water dispersible granule 2000 times liquid; 70% thiophanate wettable powder 600,800fold solution; 65% Dysen zinc wettable powder 600800fold solution; 75% chlorothalonil wettable powder 600800fold solution; 50% carbendazim wettable powder 600800x liquid 70% mancozeb can wet win powder 500 times liquid, can control the occurrence of primary infection, the effect is very good.

Symptoms and control of leaf shrinking disease in peach trees

Peach leaf shrinking disease is a common disease in spring, which mainly harms peach, green peach, cherry, apricot, plum and so on.

The pathogen is caused by outer ascomycetes in fungi.

Symptoms mainly harm leaves, and in severe cases, flowers, young fruits and twigs can also be harmed. The plants infected with the disease showed wrinkled ripples after spreading leaves in spring, the leaf tip and edge were rolled back, and the leaf surface was uneven. After that, with the growth of leaves, the leaf color gradually changed from yellowish green to purplish red, the mesophyll thickened and became brittle, and the degree of concavity and convexity increased. In late spring and early summer, a layer of white dust formed on the leaf surface, and soon the diseased leaves blackened, withered and fell off; the young diseased branches were shortened, swollen, grayish green or yellow after infection, the leaves on the diseased branches were clustered, and when they were serious, the branches withered; the diseased fruit developed malformed, the fruit surface cracked, and the fruit hairs fell off, but the surface was smooth.

The pathogen overwintered with ascospores or spores in the bud scales or on the bark. When the peach buds germinated in the next spring, the spores formed germ tubes and penetrated the epidermis or stomata to invade the tender leaves. The ascospores and budding spores produced by diseased leaves mature in late spring and early summer and occur seriously from April to May. They are transmitted by the wind, but they are generally no longer infected because of the high temperature, but they are only infected once a year. With the increase of air temperature and stop development, the disease will not occur if the temperature exceeds 30 ℃. It is beneficial to the occurrence of the disease when it is cold and rainy in spring, and it also occurs more frequently along rivers, lakes and lowlands.

Control methods: ① timely cut off the diseased branches and leaves in late autumn or early spring, remove the diseased bodies, or remove the diseased leaves as early as possible before the white powder is formed on the surface of the diseased leaves, so as to reduce the source of the disease; when the buds of ② early spring peach sprouts are enlarged without spreading leaves, spraying Baume 4 to 5 degrees stone sulfur mixture; spraying 0.1% copper sulfate solution before ③ leaves can also be effectively prevented.