Early potato blight should be prevented early
Symptoms: This disease mainly damages the leaves and can also invade the tubers. At the initial onset, some sporadic brown spots appeared on the leaves, and the lesions gradually enlarged, showing an irregular shape with concentric circles. There is a narrow fading ring around the lesion. When the disease is severe, the leaves of the plant gradually dry out from the bottom to the top, and only a few leaves on the top remain green.
The route of transmission and the law of onset: The disease is caused by the infection of the fungus Aspergillus spp., and the pathogens overwinter with the diseased tissue in the soil, and can also overwinter on the lesions of the potato block. Conidia can survive for a long time, spread by wind and rain, and repeatedly infect during the growth of the host. High temperature is beneficial to the infection of early blight; the old leaves of degraded and debilitated plants are prone to disease; the plots with thin and lack of fertilizer are seriously affected.
Control method
1. Selection: Select early-maturing and disease-resistant varieties and harvest them early.
2. Site selection: Choose to plant in a place with fertile soil and high ground.
3. Fertilization: Add organic fertilizer , increase phosphorus and potassium fertilizer, and improve the disease resistance of plants.
4. Chemical control: master the initial stage of the disease, use 75% chlorothalonil WP 600 times solution per 667 square meters, 64% antivirus WP WP 500 times, or 77% can kill WP 500 times The liquid spray is sprayed once every 7 to 10 days and continuously sprayed 2 to 3 times.
Smoke Alarms,Smoke Detector,Smart Smoke Detector,Ring Smoke Detector
Guangdong Isafenest Co.,Ltd. , https://www.isfenest.com