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Citrus resinous disease is usually called resinous disease or gummosis disease when it infects branches and trunks; it is called black spot disease or sand skin disease when it infects peel and leaves; it is called brown rot when it infects fruits during storage. The occurrence of serious often causes the destruction of large areas of citrus orchards, or a large number of rotten fruits in storage and transportation.
Recently, a user from Zhangzhou raised a question at the farm housekeeper: what's the situation?
Housekeeper expert
Feng Tao (agricultural technology station, Lu'an City, Anhui Province)
It is recommended to use tebuconazole or flusilazole or benzopropionazole to prevent and treat resin diseases.
Maoweishan (Dali, Yunnan Province, good at oranges, grapes, dates)
Citrus resin disease hazard; control methods: control with methionine tebuconazole, metamanganese tebuconazole, propionol tebuconazole, tebuconazole, allicin, peracetic acid, isocarbazide, Pythium.
Liu Fenghua (member of China Cotton Association, Heze City, Shandong Province, good at plant protection technology)
The resin diseases were controlled by Difenoconazole, pyrazolesyl ester, tebuconazole and prochlorazole.
Gao Shengtao (Shijiazhuang, Hebei Province, good at plant protection technology)
Prochlorazole was used for resin diseases.
The housekeeper preliminarily answered the prevention and control methods of Citrus "resinous disease". If you have any questions, please continue to read.
Farmer housekeeper knowledge class
Today we know about the "resinous disease" of Citrus
1、 Harmful symptoms
It mainly damages leaves, branches and green fruits. New shoots, young leaves and immature fruits are infected with the disease, and many small yellow brown or black brown grains are scattered on the surface of the diseased part, which are densely packed into pieces, rough and uneven by hand touch, so it is also called sand skin disease.
1. Branches: there are two types.
(1) Glue flowing type: it mostly occurs at the branch of trunk or trunk. The diseased part is grayish brown with water stains at the beginning, soft tissue, small cracks in cortex, brown glue liquid flowing later, the marginal cortex is dry or necrosis with wings, and the xylem is exposed.
(2) Dry type: the diseased part is reddish brown, the cortex is dry, slightly sunken, and does not peel off. At the junction of disease and health, there is an orange yellow or yellow brown color band, with no obvious glue flow. The disease develops around the trunk and goes deep into the xylem, destroying the conducting tissue, and dense black microparticles grow on the surface or under the epidermis.
2. Leaf blade: the surface of the leaf blade is scattered with black hard protuberances and small dots, some of which are dense and in the shape of sand skin.
3. Fruit: fruit damage, also known as stem rot, occurs on mature fruit, with more storage period. First, there are round brown spots with small stains on the base of the fruit, then the spots expand to the navel, the edge is wavy, the decay of the core is faster than that of the peel, when the peel is 1 / 3-1 / 2 rotted, the core has all rotted, so it is also called "piercing core rotten".
2、 Pathogenesis
The pathogen overwinters on dead branches and dead bark, and produces a large number of conidia in spring, which are transmitted by wind and rain and insects, and invades from frostbite, insect injury, shear injury, etc. From May to June, there was a lot of rain, and the first peak occurred. In 9~10, the rainfall increased again, and the disease spread again. In case of frost damage and Waterlogging Damage, the tree will be weakened and the disease will be serious. Extensive management, insufficient supply of fertilizer, untimely fertilization or improper cooperation, water accumulation in the garden, as well as serious damage caused by longicorn beetle and chitin insect are all conducive to the disease.
3、 Chemical control reference
0% medium to 800-1200 water spray for the use of water soluble powder (low toxic).
80% use of 5000-7000 fold solution of water soluble powder (low toxicity).
60% methylene sulphate and water soluble powder (low toxicity) using 800-1200 times liquid spray.
The 25% generation of manganese and water soluble powder (low toxicity) using 500-750 times liquid spray.
48% propane and its application in 1000-2000 times liquid spray.
21% peracetic acid water (low toxicity) uses 140-235 g / mu spray.
80% ethyl allicin EC (medium toxicity) uses 800-1000 times liquid spray.
40% penazole / prozolium suspension (low toxicity) uses 42-56 ml / mu spray.
16% the use of zinzolium and prozanil suspension (micro toxicity) using 800-1000 times liquid spray
Do you have a good idea of the disease after identification?
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