Poplar canker disease mainly occurred in the transplanting process of seedlings. It began to occur in late 3rd, and peaked from mid-April to late May. It basically stopped at the beginning of June and developed slightly after October. The disease can infect the trunks, rhizomes and large branches, but it mainly harms the middle and lower parts of the trunk. In the early stages of disease, blisters appear near the skin pores, and the blister bursts out of the odor-laden fluid. There are a lot of germs inside. The disease department eventually collapsed into an ulcer spot, and the cortex of the lesion turned brown and rot. When the lesion expanded horizontally around the trunk, the tree died.
Poplars are vulnerable to disease when they grow weak.
Control methods: 1 Use strong seedlings for afforestation, avoid root damage when lifting seedlings, and maintain moisture during transport. 2 ABT3 rooting powder solution was used to dip the roots before colonization, and the foot water was poured when the plants were planted. After the colonization, 5406 cytokinin 1000 times were sprayed on the young trunks. 3 Spring coat the lower part of the trunk with white paint, or spray with 0.5 Baume degree lime sulfur or 1:1:160 Bordeaux mixture to prevent trunk infection and reduce the incidence rate. If the incidence is more than 50%, the smearing will not have a significant effect and can be leveled. Poplar black spot disease The disease began in early May and was the most prosperous in the summer and autumn until it was defoliated. It can harm poplar leaves, petioles, ears, young shoots, etc., and form horny, nearly round or irregular dark brown lesions on it, with a diameter of about 1 mm and some up to 5 mm.
The lesions can be connected to irregular large patches for a long time, causing early defoliation.
Control methods: 1 Breeding disease-resistant poplar varieties. During the onset of the disease, the nursery and young trees were sprayed with 200-fold Bordeaux mixture or 85% Zeoxin 250 times. 3 Proper close planting and time cutting to keep the forest airy and transparent. Timely cleaning of leaves in the forest to reduce the source of the disease. 4 can be sprayed in early June 40% carbendazim 800 times, or 25% chlorothalonil 600 to 800 times the liquid, or O.3% urea and potassium dihydrogen phosphate mixture control. Poplar leaf blight This disease started from the leaf pumping of poplar trees and endangered the leaves, shoots, and young shoots of poplars. The diseased leaves were most affected from May to June. Nearly round, polygonal or irregularly shaped lesions appear on the victim's blade, with a diameter of 1 to 5 mm, and lesions can be connected to large spots for a long time. There are dark brown molds on the lesions.
Spots on young shoots and tender stems are recessed and prismatic with a green moldy layer.
Control methods: 1 start from the onset of the drug control, spray 2 to 3 times throughout the growing season, can be used 40% 300 aluminum diphosphonate, or 75% chlorothalonil 500 times, or 50% carbendazim 1000 Double liquid prevention. 2 Remove dead litter in a timely manner and bring out burned or buried manure outside the forest to reduce the source of bacteria. Poplar rot disease mainly affects various parts of the stems and branches of poplar branches, and the shape of the lesions is irregular and varies in size. In the early stages of the disease, the lesions were dark brown, water-stained, and then dehydrated, sunken and sunken, and sometimes the lesions were cracked and filiform. In the later period, many black spots were produced on the lesions. When wet, curly, orange filaments grow from the dark spots of the lesion. The lesions of the disease expand outwards each year. When the branches are surrounded by a circle, the upper branches and stems will all die. In the years of heavy rainfall in spring and summer, the incidence of rot disease is serious. Control methods: 1 scrape the lesion with a knife, should be scraped to the Ministry of Health, and then coated with 10 times the lesion on the edible alkaline water, or 20% agricultural anti-120 agent 10 times liquid, even coated 2 to 3 times . 2 In the spring or autumn, white paint is applied to the lower part of the trunk. The ratio of quicklime, salt, and water is 1:0.3:10.
Poplars are vulnerable to disease when they grow weak.
Control methods: 1 Use strong seedlings for afforestation, avoid root damage when lifting seedlings, and maintain moisture during transport. 2 ABT3 rooting powder solution was used to dip the roots before colonization, and the foot water was poured when the plants were planted. After the colonization, 5406 cytokinin 1000 times were sprayed on the young trunks. 3 Spring coat the lower part of the trunk with white paint, or spray with 0.5 Baume degree lime sulfur or 1:1:160 Bordeaux mixture to prevent trunk infection and reduce the incidence rate. If the incidence is more than 50%, the smearing will not have a significant effect and can be leveled. Poplar black spot disease The disease began in early May and was the most prosperous in the summer and autumn until it was defoliated. It can harm poplar leaves, petioles, ears, young shoots, etc., and form horny, nearly round or irregular dark brown lesions on it, with a diameter of about 1 mm and some up to 5 mm.
The lesions can be connected to irregular large patches for a long time, causing early defoliation.
Control methods: 1 Breeding disease-resistant poplar varieties. During the onset of the disease, the nursery and young trees were sprayed with 200-fold Bordeaux mixture or 85% Zeoxin 250 times. 3 Proper close planting and time cutting to keep the forest airy and transparent. Timely cleaning of leaves in the forest to reduce the source of the disease. 4 can be sprayed in early June 40% carbendazim 800 times, or 25% chlorothalonil 600 to 800 times the liquid, or O.3% urea and potassium dihydrogen phosphate mixture control. Poplar leaf blight This disease started from the leaf pumping of poplar trees and endangered the leaves, shoots, and young shoots of poplars. The diseased leaves were most affected from May to June. Nearly round, polygonal or irregularly shaped lesions appear on the victim's blade, with a diameter of 1 to 5 mm, and lesions can be connected to large spots for a long time. There are dark brown molds on the lesions.
Spots on young shoots and tender stems are recessed and prismatic with a green moldy layer.
Control methods: 1 start from the onset of the drug control, spray 2 to 3 times throughout the growing season, can be used 40% 300 aluminum diphosphonate, or 75% chlorothalonil 500 times, or 50% carbendazim 1000 Double liquid prevention. 2 Remove dead litter in a timely manner and bring out burned or buried manure outside the forest to reduce the source of bacteria. Poplar rot disease mainly affects various parts of the stems and branches of poplar branches, and the shape of the lesions is irregular and varies in size. In the early stages of the disease, the lesions were dark brown, water-stained, and then dehydrated, sunken and sunken, and sometimes the lesions were cracked and filiform. In the later period, many black spots were produced on the lesions. When wet, curly, orange filaments grow from the dark spots of the lesion. The lesions of the disease expand outwards each year. When the branches are surrounded by a circle, the upper branches and stems will all die. In the years of heavy rainfall in spring and summer, the incidence of rot disease is serious. Control methods: 1 scrape the lesion with a knife, should be scraped to the Ministry of Health, and then coated with 10 times the lesion on the edible alkaline water, or 20% agricultural anti-120 agent 10 times liquid, even coated 2 to 3 times . 2 In the spring or autumn, white paint is applied to the lower part of the trunk. The ratio of quicklime, salt, and water is 1:0.3:10.
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