气候变化对椪柑病害发生的影响及防治

Impact Study of Climatic Change on Citrus Diseases and Countermeasures

利用从江县1981-2005年5-10月逐日温度、降水、蒸发及持续降雨日数等气候资料,对气候变化诱发椪柑果树发生黄龙病病害进行研究。结果表明,5月下旬旬平均气温和6月上、中旬旬平均气温超过27℃、5月下旬至6月各旬降水蒸发差为正值以及持续降雨日数超过5天是椪柑夏梢发生黄龙病病害的主要因子,5月上、中旬旬平均温度、旬降水蒸发差对黄龙病病害发生的影响不明显。春末夏初高温高湿是椪柑果树夏梢发生黄龙病病害的重要条件。

The climatic factors influencing the occurrence of citrus yellow shoot trees are studied by using the climatic data of the Congjang Meteorological Bureau （the day-to-day temperature, precipitation, evaporation and number of consecutive rainy days） from May to October, 1981 to 2005. The results indicate that when the tenday average temperatures in three dekads in summer （the third dekad of May, the first and second dekads of June） surpass 27℃, the ten-day average differences between precipitation and evaporation are positive from middle May to end of June, and the number of consecutive rainy days is greater than five, the citrus yellow shoot is likely to occur. Therefore, the high temperature and humidity from the end of spring to the beginning of summer is the important condition for the occurrence of citrus yellow shoot for citrus tree tops.