(1) Disease and Incidence
1 Main pathological conditions: The pathogens invade the young leaves first, and the early symptoms were transparent water-stained dots, 0.5 mm long. The lesion quickly spread parallel to the midrib to become water-stained yellow-brown streaks. Red dots appeared in the middle of the plaque, and soon the entire lesion turned red with a narrow yellow halo around it. When the disease is severe, the leaf lesions are united and the mesophyll tissue is destroyed. Most of the leaves are withered, especially in May-June. Each sugarcane has only 5-6 leaves, of which only 3-4 leaves are disease-free. spot.
2 The law of onset: Sugarcane brown stick disease is a fungal disease, and its conidia spread by the airflow. Conidia that fall on sugarcane leaves germinate when they have a layer of water. They can invade cells by invading through the stomata. Afterwards, conidia were grown on the lesions for repeated infections. The temperature suitable for spore germination of B. grisea is 16-40°C, and the anniversary can occur, with more incidence in high temperature and rainy season. Malnutrition in sugarcane growth is the cause of serious occurrence of brown bark disease. The sugarcane fields with severe brown bar disease are mostly lack of phosphorus and potassium.
(2) Control methods
1 Fine soil preparation, adequate basal fertilizer, pay attention to the application of nitrogen fertilizer, phosphate fertilizer, and potassium fertilizer to ensure nutrient balance.
2 Select disease-resistant and disease-resistant varieties.
(3) Heavily affected sugarcane fields must be stripped of old leaves, inefficient stalks, and poorly planted and long-lived sugarcane plants, so that the sugarcane field can be aired and lightened to reduce humidity.
4 The epidemic of the disease occurs from May to June. Early management and early fertilization should be carried out to improve the disease tolerance of sugarcane.
5 when the onset, with 50% carbendazim WP 500-fold dilution, spray once every 10 days, spray a total of 2 or 3 times.
6 Implement rotation, increase fertilization, and increase fertility.
Dl Dithiothreitol,Dl-Dithiothreitol 3483/12/3,Dtt For Pharmaceutical,Dtt Dithiothreitol Biochemical Grade
ShanDong YingLang Chemical Co.,LTD , https://www.sdylhgtrade.com