1991年12月29日凌晨,我地多户桔农室外装置的温度表上都显示出摄氏零下9度。因此桔园发生严重冻害,90％的桔园一片枯黄,是建园后第4次大冻。回顾前3次大冻后都有树脂病流行成灾现象,这是因为柑桔树脂病病原菌是一种弱寄生性真菌,一般 In the early hours of December 29, 1991, the temperature meter of the multi-family farmhouse outdoor unit showed a temperature of minus 9 degrees Celsius. Therefore, a serious cold damage in Orange Park, 90% of the Orangery a yellow, is the 4th after the park was frozen. Review of the first three major freeze-thaw resin disease epidemic disaster, it is because the citrus resin pathogenic bacteria is a weak parasitic fungi, general