There are two kinds of dead and dead seedlings: First, the low temperature and rainy period of the seedling stage lasts for a long time, and once the weather is fine, the green and dead seedlings (commonly known as bacterial wilt is a physiological disease). The other is the dry or yellowish brown death caused by the pathogens such as Fusarium graminearum, Fusarium oxysporum, Fusarium oxysporum and Rhizoctonia solani in dry land under low temperature conditions. Commonly known as blight is a fungal disease). The two are interrelated.
Low temperature rainfall and insufficient light are important factors in the occurrence of the disease, especially with low temperature. In recent years, during the breeding period in our county, especially before and after the three-leaf period, the seedlings were often attacked by low temperature cold waves. At this time, the nutrients in the seeds were exhausted, and the young roots of the young leaves were very weak, and the assimilation and absorption capacity of the seedlings were also Very weak, the cold resistance is also the worst, and the incidence is heavy.
Prevention and control strategy: We should adhere to the principle of “prevention first, comprehensive preventionâ€. Adopting cultivation measures combined with the overall control technology of chemical control to control the occurrence of diseases.
The occurrence of bacterial wilt is related to the acidity and alkalinity of the soil. The alkaline soil with high pH value is more likely to occur. Before the sowing, the pH of the soil is adjusted to about 5, so as to improve the quality of the seedlings and enhance the resistance to stress. Fully decomposed farmyard manure and compound fertilizer should also be applied when leveling the seedbed. During the nursery, pay attention to heat preservation, and then transplant the seedlings as soon as possible to transplant the seedlings, so that the seedlings leave the dryland environment that is easy to disease.
Chemical control: timely medication in the early stage of the disease:
1. Sprinkle 75% dikesone 1000 times liquid, or 50% dexamethasone 800 times liquid, or 58% metalaxyl manganese 1500 times liquid, 2-3 kg per square meter.
2, 3% evil. 600 times liquid spray of water-based agent, severely sprayed once every 5 days.
3, 70% blessing. A cream (Baofusi) wettable powder 800 times liquid sprinkling. (There is a dual role of treatment and protection)
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