How to effectively control ginger stem rot

In recent years, with the continuous expansion of ginger continuous cropping area and extensive field management, the disease of ginger is also aggravating, especially since June, because of high temperature and rain, ginger stem rot is the most likely to occur. Recently, Li Hualiang and Lu Changlei in Renzhao Town, Pingdu City, Shandong Province, and Yu Wanquan in Ju County reflected that the ginger they planted there had begun to develop stem rot, looking for good control methods. The symptoms of ginger stem rot are introduced as follows: first, in the early stage of the onset of ginger stem rot, water stains of different sizes appeared at the base of the stem, gradually expanded, the leaves yellowed, and the disease spot surrounded the base of the stem for a week in the later stage of the disease, resulting in the gradual decay of the tissue at the base of the stem. Due to the obstruction of water and nutrient transport, the aboveground main stem withered and died from top to bottom, and the leaves blackened and fell off. When the humidity was high, white cotton floss could be seen in the diseased part and soil, and when it was serious, the plant began to die, causing great harm. 2. the pathogen can overwinter with mycelium lurking on diseased ginger and diseased body, or overwintering with mycelium and chlamydospore in soil under suitable conditions. Generally, it began to occur in May, and the ginger seeds with germs can continue to suffer from the disease after harvest and continue to be sown in March of the following year. 3. High temperature and humidity are beneficial to the occurrence of ginger stem rot, and the suitable temperature is 20 ℃ ~ 25 ℃. Ginger is a light-loving and drought-tolerant plant, and plots with poor ventilation and light transmission are prone to disease. The disease was serious in yellow loam and heavy clayey soil. The sandy loam soil with deep soil layer, good drainage, loose soil and rich organic matter should be selected. The suitable pH value of soil is 6-7. Phosphorus and potassium fertilizer can effectively promote the growth of ginger and improve disease resistance. The pathogen can survive in the soil for a long time, and the amount of bacteria in the field of continuous cropping plot is accumulated, and the disease is more serious. Fourth, prevention and control measures 1. Choose disease-free and mildew-free ginger to prevent the spread of diseases and pests and ensure that the whole seedling is strong. When sowing, soak the seeds with 8000 times solution of 40% Fuxing EC, or soak the seeds with 50% carbendazim 200g and 100kg of water for 4 minutes, dry and wait for sowing. two。 Soil disinfection treatment. In the plots with serious disease, 70% topiramate, 50% carbendazim, 50% dimethazone or Fumisone 1.5 kg mixed with fine soil 30 kg / mu were used for soil preparation. Disinfection with lime in acid soil can prevent soil-borne diseases. 3. Reasonable crop rotation. Rotation with Gramineae crops for more than 2 years to prevent disasters and avoid disasters. 4. Use fertilizer scientifically to improve the soil. Ginger likes the soil with good air permeability. 100kg potassium sulfate no-tillage fertilizer and 2500 kg mature soil fertilizer, 1kg boron and 1.5kg zinc can be used per mu. 5. Ridge cultivation can improve soil ventilation and promote the growth of underground stems. The ridge is made according to 1 meter width, and the ridge height is 20 cm. When the seedling height is 30 cm, a herringbone frame is built according to 4 bamboo poles per square meter to promote ventilation, light transmission and moisture flow, promote leaf photosynthesis, prevent and control diseases. 6. At the initial stage of the disease, we can also use 8000 times of Fuxing EC and 1000 times of chlorothalonil to irrigate the roots of the disease. in the initial stage of the disease, we can also use 8000 times of Fuxing EC and 75 times of chlorothalonil to irrigate the roots at the site of the disease.