Analysis of the Major Factors Causing Outbreak of Sugarcane Pokahh Boeng and Determination of Yield and Sugar Loss.

The paper was to understand the major factors causing outbreak of sugarcane pokahh boeng and the losses of yield and sugar content. The occurrence dynamics and influencing factors of pokahh boeng were analyzed. Under natural field condition, the diseased plant rate of main cultivated varieties was investigated in the damaged area and undamaged area established in the same field, and sugarcane yield and sugar content were measured and their losses were calculated at harvest period. The results showed that the prevalence of pokkah boeng mainly attributed to cultivation of susceptible varieties, high temperature and high humidity climate, accumulation of the pathogen and improper cultivation and management measures. Survey data showed the diseased plant rates were 63.3%-95%, with an average of 81.1%; the yield loss rates were 30. 2% -- 48. 5%, with an average of 38. 42%; the sugar content were reduced by 2. 63% -- 5.21%, with an average of 3.61%; the sugarcane juice brix were dropped by 2. 4 - 4.69 °BX, 3. 61°BX on average; the gravity purities of sugarcane juice were decreased by 1. 99% - 8.14%, 4. 83% on average; the reducing sugars of sugarcane juice were increased by 0.05% - 0.6%, 0.16% on average. It is confirmed that the occurrence and damage of sugarcane pokkah boeng is severe at present stage, leading to huge loss of sugarcane yields and sugar content. Sugarcane pokkah boeng has become one of the main barriers of sugarcane production, and scientific and effective prevention and control of sugarcane pokkah boeng is very important for sustainable development of sugar industry. [ABSTRACT FROM AUTHOR]