Autumn is one of the important seasons for the maintenance and management of seedlings. In the fall, there are many tasks to be done in northern garden management, especially cold protection and pest control. Good management at this time will have a multiplier effect on the growth of nursery stocks throughout the year, especially the unusually low temperatures in parts of winter in China. With huge economic losses, in order to prevent similar disasters caused by extreme weather and pests this year and minimize economic losses, the technical points for protecting against cold and plant diseases and insect pests in late autumn are described below.
Reasonable water control If the water content of the tree is too large, once it encounters low temperatures, the tree will swell and swell, causing cracking of the bark and death of the seedlings. According to the investigation of winter cold disasters, the greater the water content of trees in late autumn, the higher the rate of frozen trees death. Except for special droughts, irrigation is generally not required.
The scientific topdressing autumn is mainly applied to farmland manure and compound fertilizers, but no topdressing or a small amount of nitrogen topdressing is applied. The topdressing fertilizer was applied to the growth of lateral roots of the seedlings, and the conifer trees stopped topdressing nitrogen fertilizer 30 days before the top of the seedlings. If excessive nitrogen fertilizer is applied, the seedlings will be prosperous in autumn branches, the degree of lignification is low, and the ability to resist coldness will decline.
Whitening the trunk with lime and lime sulfur to whiten the branches can reduce the damage of the seedlings to the sunny side due to the large temperature difference between day and night, and also can kill some wintering pests and diseases.
Erection of Wind Barriers To reduce the damage caused by the cold and dry winds on the trees, a wind barrier can be erected in the direction of the trees. Windbreak height exceeds tree height. In addition, the wind barrier should also be supported by sticks, bamboo sticks, etc. to prevent the wind from falling down.
Wrap straw or plastic film on cold-tolerant trees, use a dry roll of grass rope or a trunk and some main branches with straw to protect against cold, and let the trees put on “cotton coat†before winter arrives.
The bark is treated to scrape off diseased skin, insect skin, etc. at the trunk, branch and branch branches, and is burned or buried deeply. It can effectively eliminate the diseases and insects that are overwintering in the bark. The depth of the skin scraping is preferably yellowish-green on the skin. Apply 40% Formamide arsenic wettable powder 50 to 100 times liquid or 5 to 10 Baume degree lime sulfur to the wound to protect the wound.
Spraying to prevent trees from defoliating and spraying once with 5 Baume degrees of lime sulfur plus 200 times of sodium pentachlorophenol to eliminate overwintering pathogens and eggs, and to reduce the damage of pests in the following year is significant.
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