Symptoms of Disease: Every year, Northeastern Schisandra production areas suffer from varying degrees of frost damage, lighter branches are frozen, and severe cases cause the death of the whole plant. In the early stage, the affected leaves showed irregular small spots. As the time went on, the spots became contiguous and developed into large mottled patches. The leaves faded and the leaf margins were dry. The new shoots at the late onset are severely dehydrated and wilted. The tissues are dry and dead and the leaves are dry and fall, and the tree vigor is weak. The first is the effect of temperature. After the schisandra sprouts in spring, sometimes the temperature drops sharply at night, and the water vapor condenses into a frost that freezes the young part. Frost and terrain also have a certain relationship. Because of the large proportion of cold air, low-lying land often has a larger temperature range than flat land, and the duration is longer. Some schisandra plants are selected on the frost road, or they are selected in the ditch where cold air is likely to condense. In the bottom valley, it is very vulnerable to late frost.
The law of onset: From March to May is the peak period of the disease, there is a night frost in the eastern mountainous region of Liaodong in May each year. During this period, the schisandra is extremely seriously affected by freezing. Different schisandra varieties have different cold tolerance capabilities. The earlier the maturity stage, the weaker the cold tolerance ability of the varieties, and the larger the reduction in output. The tree shape, the tree potential and the freezing injury also have a certain relationship, and the weak trees are more severe than the sturdy trees; the branches are more mature. The higher the degree of lignification, the lower the water content, the higher the cell liquid concentration, the more accumulated starch, and the stronger the cold resistance. Different management measures, the degree of victimization of Schisandra is also different, soil moisture is relatively large, the implementation of sprinkler Schisandra damage is lighter, while the park is not watered damage is heavier.
Prevention and control measures: 1 Scientifically build gardens, choose sunny slopes or flat lands to build gardens, and avoid frost and valleys so as to avoid and mitigate the dangers of late frost. 2 Cover the ground, cover the roots of schisandra with corn and other stalks, prevent the soil from heating up, postpone the time of leaf development and flowering of schisandra, and avoid the danger of late frost. 3 smoke insulation, after the sprout of Schisandra, pay attention to listening to the local weather forecast, in the evening there may be frost when the temperature dropped to 1 °C, lit accumulation of damp branches, leaves, sawdust, wormwood, covering the above 1 Clay to extend the burning time. Tobacco piles must be arranged around the orchard and on the work track, and smokestacks should be installed at the upper air outlet according to the wind direction so that the smoke can be quickly covered with orchards. 4 spray irrigation insulation: According to the weather forecast can be a large number of irrigation on the ground, plant canopy spray water to keep warm. 5Apply fertilizer, apply nitrogen fertilizer reasonably during the growth season, promote shoot growth, ensure robust tree growth, use appropriate amount of Phospholipid at the later stage, promote the early growth of shoots, facilitate tissue enrichment, extend nutrient accumulation time, and thus better Exercise cold resistance. Spraying antifreeze and P and K fertilizers can prevent 2~5°C low temperature for 5~7 days.
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