1. What is the cause of sugarcane heart rot? Generally speaking, sugarcane heart rot is mainly caused by sugarcane pineapple disease, which mainly occurs in sugarcane seedling stage. The heart leaves of the seedlings are short, the leaves and spikes are green, and the inside of the leaf sheath is brown and rotten, accompanied by stench. When observing the diseased tissue under the microscope, a large number of bacteria overflowed. The seriously ill sugarcane plants will die because they can't pull out the heart leaves and grow new roots. Plants with mild illness can grow to adulthood and return to normal, but they can still see signs of illness. Pineapple disease is the disease that has the greatest influence on sugarcane production. In addition to the damage to the lower sugarcane, it can not germinate, and it will also lead to the decay of stored sugarcane seeds.

Second, the control methods of sugarcane heart rot

1. Choose disease-free seedlings, you can choose top seedlings, the stems are medium thick, and there is no disease harm. This kind of seedling has high germination rate and relatively mild disease symptoms.

2. Before planting, sugarcane seeds need to be disinfected. Seeds can be soaked in low-concentration lime water 12-48 hours, and then sprayed with chemicals such as carbendazim and thiophanate for disinfection.

3. Improve the cultivation measures. In winter, plants can be covered with plastic film, which can also keep warm, promote the early growth of seedlings and reduce the possibility of pineapple disease.

4. Intensive cultivation: For plots with heavy soil and high water level, break the ground and level off, ditch and drain, and cover lightly after planting.

5. Choose excellent early-maturing and fast-growing sugarcane varieties. Autumn planting sugarcane has high temperature and quick germination, so it should be popularized vigorously.

6. After sugarcane planting, measures such as maintaining proper soil moisture and preventing drought and water accumulation are beneficial to the prevention and control of diseases.

7. It is recommended to choose disease-free sharp seedlings, which germinate quickly and have light diseases.

8. When planting sugar cane in winter and spring, cover it with plastic film to raise the ground temperature, so that sugar cane can grow early and quickly and reduce the incidence.

After planting sugarcane in autumn, the diseases of sugarcane and pineapple are very light in case of high temperature and drought, and the incidence rate is over 90% in case of rainstorm or typhoon. After planting sugarcane in spring, the ground temperature is lower than 19℃ or the disease is serious when it rains for a long time. In addition, the soil is sticky and hardened, and the sugarcane field is prone to waterlogging, high humidity and serious diseases.

9. The disease-resistant varieties such as Yue 3, Yue sugarcane 64/395, Co28 1 were screened out.