There are many types of diseases and pests of citrus. The following describes the main symptoms and prevention methods of pests and diseases:
1, scab disease. The main damage to tender foliage, young fruit. The leaves began to have water-stained, small spots that became waxy yellow. After the victim suffers, many nodules grow. Control methods: When germinating 1 cm of spring buds, spray 50% of tetromycin 500 times or 70% thiophanate-methyl 800 times. The second time at the end of the flower, spray 70% thiophanate-methyl 800 times.
2, anthrax. The main feature of anthrax is that in the rainy and high temperature, the lesions appear red dots, and in the dry conditions, they are black dots, showing a roulette pattern. Control methods: Spray 1 to 2 times during young shoot stage and young fruit period, 0.5% equivalent Bordeaux fluid, or 50% trehalose 500 times, or 70% thiophanate methyl 800 times.
3, Huanglong disease. The main symptoms: In addition to the emergence of yellow shoots, the main characteristics of the disease are identified: The base and edges of the leaves are yellowed, irregular yellow-green mottled leaves appear. Control methods: (1) Choose disease-free seedlings and isolate wards for planting. (2) Strictly control the vector of disease-transmitted citrus hibiscus, and use insecticide to protect shoots at each shoot stage. Use omethoate 1,000 times, quinone purine 2000 times, and imidacloprid 2,000 times. (3) Issue a diseased tree, excavate in time, eliminate the source of the disease. 4. The mites are mainly red spiders and rust ticks. Red spiders are harmful to leaves, fruit and young shoots. The damaged leaves are gray and white. Rust tick mainly damages the fruit, causing black peel. Red spider control method: In the winter, use Bami 1 degree lime sulfur agent to clean the garden. During the growing season, diclofenol, JinBaBa, isocarbophos, chlorpheniramine and other acaricides may be sprayed in turn, once every 7 to 10 days, and continuously for 2 to 3 times.
4. Prevention and treatment of rust ticks: Starting from June of each year, when the density of wormholes is observed and rust wall ticks are infested, they are immediately sprayed and controlled. The drugs used are the same as those used for the control of red spiders.
5, 蚧 class. There are mainly blows, shields, etc. that damage branches and fruits to weaken the tree vigor, induce soot, reduce the yield and quality of the fruit. Control methods: In the winter, use 16 to 20 times the pine grease mixture to clean the garden and cut off the worm branches. The prevention and control focuses on the first consecutive spraying of the first generation of nymphs between May and June. The agents used are: 40% omethoate 500-800 times, 40% water-containing phosphorothiophene 800 times, these two drugs Adding 100 times the oil emulsion has better effect. Slaughter special 1500 times, speed culling 1500 times.
6, leaf miner. Commonly referred to as plot worms, ghost symbols, larvae sneak into the young leaves under the epidermis to feed on the back of the leaves to form a white curved insect path, leaf curling, the most serious victims of summer and autumn shoots. Control methods: wipe out the sporadic young shoots, put them together, and spray them in a concentrated manner. In the summer and autumn shoot shoots and grain rice, spray the first time, and spray once every 7 to 10 days. Drug 2 times, can be used 1500 times moth treasure, the enemy killed 2000 times; An Lubao 1500 times to kill, spot potential ~ E 1500 times.
Tg Concentrates,Fish Oil 5/25 Tg,5/25 Tg Tg Concentrates,Fish Oil Omega-3
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