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Citrus Sandra dermatosis is also known as black spot disease in production. It is a relatively popular and serious resin disease in recent years. In severe cases, it is very likely to cause the destruction of citrus. At present, this disease has become one of the key diseases that citrus are concerned about. In May and June of the south, it is often the season for plum rain to occur frequently, with more rain and relatively high humidity in citrus orchards. The occurrence of this extreme weather often causes a large number of wounds in the fruit tree, which leads to an increase in the probability of citrus Sandra dermatosis. This period of time is often the growth period of citrus young fruits and the physiological fruit falling period. During the germination period of summer, it is particularly important to prevent and treat citrus sarcoidosis.
What are the small black spots of sarcoidosis?
Because the pathogen of sarcoidosis is a weak parasitic fungus, after the pathogen invades, it is quickly protected by the host's defense reaction: secreting gelatinous substances surround the germ, and at the same time the oil cells rupture and release volatile compounds to kill the germ, resulting in the expansion of the germ being restricted, and the infected tissue forms protruding and visible black spots to the naked eye.
Simply put, the black spots of citrus sarcoidosis are the host's defense. As for the product, once the germs are infected, black spots will occur. But the fatal thing is that small black spots cannot be eliminated, which has a great impact on the product rate of fruits.
Therefore, the focus of prevention and control of germ 6 must be on preventing germ infection !
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日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本日本� The main sources of infection of l0 diseases are ascospores and conidia produced in the bark of dead branches and rotten branches in orchards.
When the diseased dead branches die, the mycelium of the pathogenic bacteria that diapauses in the dead branches quickly turns into vegetative growth and reproduction. Therefore, poor management and weak tree potential, especially in orchards with severe frost damage, orchards with severe branch resin diseases, which are prone to major outbreaks of sand dermatosis. The optimal temperature for pathogenic conidia infection is 24-28℃, which is inhibited above 32℃. At the optimal temperature, the fruit surface and leaves can be successfully infected after 4 hours of continuous high humidity, so it is usually the most common in the field. Under suitable conditions, only 4-7 days from infection to symptoms.
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citrus sand dermatosis hazard time
citrus sand dermatosis can occur throughout the year. Rain water in summer and autumn is mostly the peak period, and citrus frost damage during cold winter and spring is also the main reason for induced sand dermatosis.
1. In the spring spring, the spring shoots are germinated and grown;
2. After the flowers are faded, young fruits will begin to be harmed from late April to mid-May;
3, mid-May to mid-June The main harm of summer skin and fruits, mainly harming fruits; the leaves, branches and fruits from July to August are all affected;
5 and September are harmful to autumn skin and fruits.
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0 citrus sand dermatosis transmission route
citrus sand dermatosis pathogens are three pathogens, all of which are weak parasites. The pathogens are used by mycelium and conidia to overwinter on dead branches, dead bark, and diseased branches and leaves.
1 Sick dead branches are the main diseases in the coming year The source of infection . The temperature of the following spring is 15-30℃. When it is rainy and humid, overwintering bacteria begin to reproduce in large quantities and spread to new shoots, tender leaves and young fruits with the help of wind, rain, dew, etc.
2. The bacteria are spread by wind, insects, and rain.
3. The tree is weak, or injured orchards are prone to cause this disease, especially in areas or years of severe frost damage.
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00 citrus sand dermatosis leaf disease
1. At the beginning of the disease, small needle-like spots with clear and greening are produced
2. After the condition worsens, brown or black brown hard grain dots
3. After the leaves and branches are mature, black small black dots
. More serious citrus dermatosis
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0. The disease process of citrus dermatosis fruit
1. The pathogenesis invades immature fruits. The disease condition is similar to that of the branches and leaves. The surface of the diseased part forms brown or black dots, linear, curved, ring or amorphous hard grain dots.
2. When the bacterial concentration is high, the disease is mud-like or tear-stained.
Citrus Sandrade Prevention and Treatment Plan
Step 1: Prune in winter or early spring, spray the garden-clearing agent, cut off the dead branches in winter or early spring, take them out of the garden, burn them in a concentrated manner, and carry them together with the Qingyuan-clearing drug plan;
Step 2: Citrus germination stage, phenyl ether mecyclazole + manganese (400~500 times)/pyrazole + manganese (400~500 times);
Step 3: When is 2/3 of the flowers, select the agent: combine protective agent with internal absorption treatment agent. 30% benzine, pyrazole (2000~3000 times) + manganese substitute (400~500 times);
Step 4: young fruit stage; choose a dosage form with good safety according to different varieties of citrus, such as honey pomelo young fruit stage, and the emulsion oil dosage form should be paid attention to. Some emulsion products can also be used. Protective agents are used in combination with intraabsorbent therapeutic agents and rotated with the last medication. 30% benzophyllazole (2000~3000) + manganese substitute (400~500) / 30% oxime lipid·bupivazoleol (2000~3000) + manganese substitute (400~500);
Step 5: fruit-swelling stage; According to the occurrence of orchard salder disease, you can initially check whether there is any sandal disease on the leaves and young fruits and whether there is any fruit. You should look carefully, do not be careless, adjust the concentration of the medication according to the occurrence to prevent large-scale transmission. 40% fluorocycinazole· 海子 (2000~3000) + manganese substitute (300~400)/30% oxime lipid·bupivazoleol (2000 times) + manganese substitute 300 times;
Step 6: autumn shoot period; autumn shoots are the main fruiting mother branches in the coming year, and the prevention and treatment of sarcoderma must be done well. 40% fluorocycinazole·Doglycerol (2000~3000) + manganese (300~400) / 30% oxime lipid·piperazole (2000 times) + manganese (500 times) / 30% benzopyrazole (2000~3000) + manganese (500 times).
Recommendation: Mancozeb above can be rotated with Desenzin or Prosenzin or Kergundam for 1-2 times. The germs of the dermatosis are prone to resistance to drugs, so the recommended drug to be used in rotation.
Note: Pay close attention to weather changes. You must use medicine in time before long-term rain and spray after rain. In previous years, orchards with severe sand dermatosis have increased by 1 to 2 times from the young fruit stage to the early autumn shoot. It is recommended to replace manganese 300 times.
Disease prevention and treatment manifestations
No matter which environmental stress, such as high temperature, frost damage, drought and flood, or other pest invasion, will affect the tree momentum to varying degrees, giving sand dermatosis an opportunity to take advantage of.
Therefore, it is particularly important to prevent sandal disease, strengthen cultivation management, and stabilize the tree potential.
Mainstream agents for preventing and treating citrus marrow dermatosis
40% fluorocycinazole·Doglycerin SC
30% oxime lipid·piperazole SC
30% benzophyllazole SC
33 0% benz ·propyridazole EC
Shanghai Shengnong Biochemical Products Co., Ltd.
Ye Guowen: 13870455306
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