Blight is also known as seedling damping-off disease. It occurs in nurseries all over China. It mainly damages coniferous seedlings such as pine, larch, and yew. In the short term, it causes a large number of seedling deaths. After the seedlings became ill, the dead people said that they had fallen ill, and those who died did not mention blight. According to the occurrence law of seedling blight, comprehensive prevention and treatment measures based on nursery techniques should be adopted.
1. Disinfecting soils As the pathogens of Rhizoctonia solani are mainly derived from soil, they can be treated by chemical methods. In alkaline soil, 225-300 kg of ferrous sulfate powder is applied per hectare before sowing, which can not only prevent disease, but also increase the iron element in the soil and change the PH value of the soil, so that the seedlings grow robustly. In acid soils, 300-375 kg of lime per hectare is planted before sowing, which can suppress germs in the soil and promote plant rot. In addition, formalin can also be used for disinfection by using 50 ml of 40% formalin per square meter, adding 6-12 liters of water, sprinkling the soil 10 days before sowing, and covering it with a straw bag. 3-4 days before sowing, remove the cover and plant the seedlings.
2. Strengthen nursery management Rational fertilization, careful land preparation, timely transplanting, timely drainage and irrigation, pay attention to cultivating and weeding, and strengthen field management. This is conducive to the growth of seedlings to prevent littering. The incidence of seedlings should be promptly controlled by chemical agents. For the seedling damping-off disease, due to the onset of rainy days, the Bordeaux multi-solution solution is easy to lose and produce phytotoxicity. It can be used in black and white ash (ie 8:2 fly ash and lime) per hectare of 1500-2250 kg, or 65% of the enemy. 2 grams per square meter, mix well with fine yellow soil and spread on the neck of seedlings to prevent the spread of disease. For the blight of seedlings, timely loosen the soil so that the roots of the seedlings grow well and enhance the disease resistance of the seedlings. It is also possible to use 2% ferrous sulfate to dry and pulverize and finely mix the dry soil and spread 1500-2250 kg per hectare. Or use 65% Dixon, 4 grams per square meter, mix well with the thin yellow soil, spread on the neck of the seedlings, and then loosen the soil once to make the medicament contact with the roots of the seedlings, which can inhibit the disease from expanding.
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