Control of Fusarium wilt of Populus tomentosa
Fusarium wilt of Populus tomentosa is a common disease of Populus tomentosa in recent years, which is characterized by severe disease, fast transmission and great influence on greening effect. Although this disease is stubborn, if we can take correct measures, aimed at the pathogen, multi-pronged measures can still achieve satisfactory results of prevention and control.
At first, the symptoms of Dasan yellow poplar were just three green trunks of a branch, and then the whole branch and three branches of the whole plant were withered and lost water. In the later stage of the disease, three pieces are yellow and white, and the seriously infected ones will lead to plant death.
The pathogen of the disease is Fusarium oxysporum in the soil. Most of the germs invade from the root wound and can also invade the plant directly. The disease usually begins in the middle of May, and the peak is in July and August, and some plants do not exceed a week from disease to death.
Prevention and control methods 1. Strengthen epidemic inspection, strictly prevent diseased plants from entering non-epidemic areas; 2. Strengthen water and fertilizer management, improve plant disease resistance, cultivate land should be kept moist, but not stagnant water 3. If diseased plants are found, the diseased plants should be pulled out and burned in time. The cultivated land can be irrigated and disinfected with 75% chlorothalonil wettable powder 600 times per square meter, the dosage is 5 to 6 kg per square meter, and the rice can be continuously irrigated three times, each time at an interval of 5 days. 0.5 kg of sulfur powder can also be fully mixed with the soil for disinfection. 4. For undiseased plants, 50% carbendazim 500 times or 65% Dysen 1000 times can be alternately sprayed for 2 to 3 times.
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Problems and Countermeasures in softening cultivation of Dutch Chrysanthemum in Winter
Dutch chrysanthemum, also known as Dutch chicory, Jikang vegetable, French bitter borage, is a biennial or perennial herb of Compositae, which feeds on the bud balls produced after fleshy root softening cultivation as the product. Dutch chrysanthemum bud balls are creamy, slightly bitter and sweet, to crisp to tender, can be used for raw food, or made into delicious appetizer salad. In particular, bud balls contain bitter substances that are not found in general vegetables, such as chestnut bark glucoside, wild lettuce, orchidin and mountain lettuce bitter, which have the health effect of clearing liver and gallbladder, and have become the aristocracy of vegetables.
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The North Korean yellow poplar was sown at the right time.
Recently, due to the increasing use of Populus tomentosa in the north, manufacturers have begun to use sowing instead of cutting to propagate the variety, but the technical details are generally unfamiliar. Experts warn that the life span of Populus tomentosa seeds is short after maturity, so it is most appropriate to sow seeds from now on to September 20. Populus tomentosa belongs to the evergreen shrub of Populus tomentosa. It can be transplanted throughout the growing season, can withstand the low temperature of-35 ℃, has strong sprouting power and is resistant to pruning, and is suitable for hedges or pruning into various patterns. According to Donggang City, Liaoning Province
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