Due to the influence of climate, potato is prone to late blight before and after wheat harvest every year, and it is easily spread in large areas, which makes it difficult to control it later. On June 4, we discovered that the potato late blight was very serious in the area of ​​Liu Fakong, Bijia Village, Hou Town, Shouguang City.
The main symptoms of potato late blight: leaf, stem, tuber can be disease. Leaf disease, mostly in the tip or leaf margin produce dark green water stain spots, rapid expansion when the humidity is high, the lesions turn dark brown, and produce a circle of white mold, known as the "mild wheel", especially the most obvious leaf back The stalk and petioles develop brown streaks, and the diseased leaves droop. When heavy, the stems and leaves of the whole plant are scorched and emit odor. Tuber disease, brown or purple brown slightly sunken lesions, lesions gradually expand into large lesions, and the downward development of the subcutaneous potato meat was dark brown necrosis, infection of diseased potato blocks began to decay.
The main cause of the disease: The pathogens mainly overwintered in mycelium with mycelium, and the diseased potato or the diseased potato left in the field germinated to form a central diseased plant. The sporangia produced by the disease minister spread by wind and rain, which enabled the disease to spread rapidly, and the disease on the ground borrowed rainwater. And the infiltration of ground water into the soil can infect the soil in the potato block to make it sick. 18 °C ~ 20 °C, relative humidity of more than 95% for disease, long-term and rainy, the disease is easy to prevalence.
Control measures:
1. Use resistant varieties. The resistance of different varieties to late blight disease is very different, because the potato late blight bacteria are prone to variation, the use of Kexin 4, Wumeng 601, the Netherlands No. 7 and other disease-resistant varieties.
2. Seed processing. Soaking with a systemic fungicide, such as 50% carbendazim 500 times or 200 times formalin solution soaking. Then piled up and covered tightly, boring for 2 hours, then spread out to dry.
3. Scientific fertilization, appropriate increase in phosphorus and potassium fertilizers and bio-organic fertilizers. While applying 2500 kg of soil miscellaneous fertilizer per acre, 100 kg of no-tillage fertilizer is used as base fertilizer per acre. No-tillage fertilizer can improve the soil, increase the permeability of the soil, and supplement the trace elements such as boron, zinc and calcium that are required by potatoes. It is more appropriate to apply no-tillage fertilizer to continuous cropping plots of heavy crops.
4. Chemical control. Per acre can be used silver spray 75 ml plus Antai 100 g spray; can also be used 50% metalaxyl 500 times or 52.5% fast net 2000 times liquid plus 6000 times natural brassin --- Shuofeng 481 Foliar spray.
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