The reason for the drying of large-leaf boxwood branches and leaves is caused by many possible diseases and insect pests, which may be stem rot, or powdery mildew, of course, many times more close and serious is the large-leaf boxwood blight, which is a more common disease, the leaves will suddenly dry up, if not taken in time, it may cause death, today share Shandong large-leaf boxwood: large-leaf boxwood seedling blight what are the causes? How to cure it?
Recently, Xiaobian found that many people will ask some questions about the disease and pest of large-leaf boxwood, and the specific summary is the following problems: the newly planted large-leaf boxwood dies in a large area, planted in March and April in the spring, two months later, June and July, the whole large-leaf boxwood top leaves lose green, lose water and wilt, after three or four days, the branches lose water and dry, the whole plant leaves wither, and rub into powder. The dead plant is uprooted, and the cortex at the rhizome (under the surface of the surface) has decayed, and white filaments can be seen. There are no new roots in the root system. If one strain occurs, several surrounding strains may become infected and become ill one after another.
At the beginning of the disease, only the leaves on individual branches appear to dry and lose water, and then the entire branches and leaves are dehydrated and dried. Manifested in one or two branches or even one-third of a branch on a particular tree. The leaves are yellowish-white in the later stages of disease, and the entire plant dies in severe cases. Germs mostly invade from root wounds, but can also invade from other sites. The onset of the disease generally begins in April to May of each year, and the incidence period is high from June to August. The pathogen is Fusarium in the soil.
Prevention and control of populus macrophylla blight:
1. Strengthen the inspection of the epidemic situation and strictly prevent diseased plants from entering non-epidemic areas;
Second, strengthen water and fertilizer management, improve plant disease resistance, cultivation land should be kept moist, but can not accumulate water;
Third, if the diseased plant is found, the diseased plant should be removed and burned in time, and the cultivation site can be disinfected with 75% bacterium Clear Wettable Powder 600 times liquid per square meter, with a dosage of 5 to 6 kg per square meter, and watered three times continuously, each time at an interval of 5 days; It can also be mixed with the soil with 0.5 kg of sulfur powder for disinfection;
Fourth, for the plants that are not diseased, the plants can be controlled by alternate spraying with 50% carbendazim 500 times liquid or 65% daisen zinc 1000 times liquid, and spray 2 to 3 times continuously.
Under what circumstances is it easy to get sick?
1, the growth trend is weak, due to soil compaction, poor air permeability, underdeveloped root system, weak upper growth, easy to occur;
2, soil-borne diseases, soil for a long time is not disinfected, a large number of germs in the soil, wait until the right conditions immediately infect plants;
3. Winter drought is frozen, causing root damage or frostbite of branches, causing spring rejuvenation, consuming more nutrients, root nutrient supply is not timely, branch bark frostbite nutrient transportation is blocked, and gradually showing dry and dead leaves and branches.
The above is The Shandong large-leaved boxwood: what are the causes of large-leaf boxwood seedling blight? How to cure it? Full text sharing, there are many problems about large-leaved boxwood diseases and insect pests, and Xiaobian also summarizes the experience and articles on the prevention and control of most seedling diseases and insect pests if you need more treatments
You can refer to the following articles:
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