With the gradual decline in temperature, most of the greenhouse vegetables have entered the planting period and the slow seedling period. The prevention and treatment of diseases in the planting and slow seedling period is a very critical task, which determines the growth of the seedlings and future yields.
1. Root disease
Since the amount of watering is generally relatively large during planting, and the planting in the low temperature period, the soil temperature is low and the water content is too large, which easily induces the formation of root rot in the root system. If the seedlings are wounded during planting, the germs are more likely to invade from the wound and cause root rot. In the early stage of the disease, yellowish-brown lesions appear. In severe cases, the roots may rot or even necrosis of the entire roots. White or red mildew appears in the lesions. When root rot occurs, it is recommended to hoe in time.
Use hoeing to increase soil permeability and reduce soil moisture. At the same time, use methfludioxonil + humic acid or seaweed rooting fertilizer + Bacillus subtilis for root irrigation. It is recommended to irrigate the roots before the slow seedling water to facilitate the absorption and utilization of the medicine.
Stem base rot is often caused by deep planting or artificial damage to the young stems during transplanting. When the soil moisture is high, the wound pathogens can invade. The location of the disease is mainly at the base of the stem of the seedling, 2 to 3 cm below the soil surface. In the early stage, brown sunken spots are produced and extend to 4 weeks. In severe cases, the seedlings wilt and die around the stem to prevent stem base rot. It is also recommended to use hoeing to control water. It can be used to irrigate the roots with methoxamethazin + tetramycin octylstrobin.
2. Leaf diseases
In the occurrence of anthracnose, the diseased spots on the leaves are nearly round, with unclear borders and dark brown rings. Due to the poor resistance of plants in the slow seedling stage, some safe agents are selected for control, such as chlorothalonil, difenoconazole, pyraclostrobin, etc., used together with foliar fertilizer.
In the occurrence of downy mildew, light yellow nearly round and polygonal lesions are formed on the leaf surface. When the humidity is high, a black mold layer is formed on the back of the leaf. It is recommended to use silver farad + dimethomorph in combination with thiazolium copper, zhongshengmycin, etc. for prevention and treatment.
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