Poplar common diseases and their prevention methods

I. Populus canker

1 The onset of disease mainly occurred during the seedling transplant process. It began in late March and peaked between mid-April and 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.

2 Control methods

2.1 Select strong seedlings for afforestation, avoid root damage when lifting seedlings, and maintain moisture during transportation.

2.2 ABT3 rooting powder solution was used to dip the roots before colonization, and the foot water was poured at the time of colonization. After colonization, 5406 cytokinin 1000 times was sprayed on the young trunks.

2.3 Spring coat the lower part of the trunk with white paint, or use 0.5 Baume degree lime sulfur, or dry with 1:1:160 Bordeaux mixture to prevent trunk infection and reduce the incidence.

Second, poplar black spot

1 The law of onset of the disease began in early May, the best summer and autumn until the deciduous. It can harm poplar leaves, petioles, ear, young shoots, etc., and form horny, nearly round or irregular dark brown lesions on it, with a diameter of about 1mm and some up to 5mm. The lesions can be connected to irregular large patches for a long time, causing early defoliation.

2 Control methods

2.1 Breeding disease-resistant poplar varieties.

2.2 During the onset of disease, the nursery and young trees were sprayed with 200-fold Bordeaux mixture or 85% Zeoxanthin 250-fold.

2.3 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.

2.4 In the early June, spray 40% carbendazim 800 times, or 25% chlorothalonil 600 to 800 times, or 0.3% urea and potassium dihydrogen phosphate mixture control.

Third, poplar leaf blight

1 Onset of the disease The disease begins with the pumping of poplar leaves, endangering poplar leaves, young shoots, and young stems. The affected leaves are 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.

2 Control methods

2.1 From the onset of the disease, carry out chemical control, and spray 2 to 3 times of the drug during the whole growing season. It can be used to control 40% of alfa-aluminum 300 times, 75% of chlorothalonil 500 times, or 50% of carbendazim 1000 times. .

2.2 Timely removal of litter, and bring out concentrated burned or buried manure outside the forest to reduce the source of bacteria.

Fourth, poplar rot disease

1 Incidence of disease Poplar rot disease is a host-dominant disease, which is a common and frequently occurring disease, and it is extremely harmful to poplars. When diseases such as drought, blisters, sunburn, and frost damage cause deterioration of the vigor of the trees, and if it is not easy to restore the vigor of the trees after transplanting seedlings or cutting their strength, the disease will quickly occur, and the light will affect the growth of the trees and the leaves will be left late. Smaller leaves and dead branches, withered stems and other diseases; in serious cases caused the death of the trees. The pathogen spreads by wind, rain, insects, and birds, and it invades indefinitely from dead skin without injury. It has the fastest growth rate in the spring and autumn. The diseased poplars in northern China generally began to develop in mid-March. May was a period of high incidence of disease, and in July, the disease eased, and development stopped in September. It mainly harms various parts of stems and branches of poplars, 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.

2 Control methods

2.1 scraping the lesion with a knife, should be scraped to the Ministry of Health, and then coated in the lesion 10 times the food of alkaline water, or 20% of agricultural anti-120 agent 10 times liquid, even coated 2 to 3 times.

2.2 In the spring or autumn, apply a white paint on the lower part of the trunk. The ratio of quicklime, salt, and water is 1:0.3:10.

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