【摘要】 针对梨锈病连年大发生的问题,对该病害发生动态、影响因素及防治方法进行了研究。调查结果表明,梨锈病发生受温度与降雨量影响,发病盛期于3月下旬—4月中旬,感病始期为叶龄3 d左右,以叶龄6～15 d发病最重,叶龄21 d后不再感病。提出于梨树花前叶龄3～6 d病斑始见期,谢花2/3及谢花后8～10 d连防3次为最佳防治时期;同时推荐使用三唑酮、戊唑醇、吡唑醚菌酯、苯醚甲环唑进行交替使用,避免产生抗性,可有效防治梨锈病。更多还原

【Abstract】 In view of the problem of pear rust(Gymnosporangium haraeanum Syd.) occurring year after year,the occurrence dynamics,influencing factors and control methods of the disease were studied in this paper.The results showed as follows:The occurrence of pear rust was affected mainly by the temperature and rainfalls? the occurrence peak period of pear rust was from late March to mid-April? the initial stage of the disease was about 3 days of the leaf,and the disease was the most serious after 6-15 days? leaves no longer got sick after 21 days.It was suggested in the paper that three best times for prevention and treatment were at the onset of disease spots on the front leaves of pear trees at the age of 3-6 days,at the time of 2/3 flowers out,and 8-10 days after anthesis.At the same time,it was recommended to use triazolone,tebuconazole,pyraclostrobin and difenoconazole alternately to avoid the disease resistance and prevent pear rust effectively.更多还原