【摘要】 对叶片上苹果斑点落叶病田间调查结果表明,发病从5月上旬开始一直持续到9月上旬。其中6月下旬和8月下旬至9月初为两个发病高峰期。化学防治的田间试验表明:保护性杀菌剂和治疗性杀菌剂在病害发生初期开始喷药,防效均可达80%左右。化学防治的关键时期为5月上旬至6月上旬,7月下旬至8月上旬为补充防治时期,化学防治期应持续到8月中旬。更多还原

【Abstract】 Field investigation showed that Alternation mali Roberts took place from early May to early September. The last ten-day period of June and August to early September were two peaks of the Alternation mali Roberts, which impacted the growing of the trees heavily since the disease occurred. The control of chemical fungicides gave the result that both protective and cure fungicides could get about 80% control efficacy. The key period of control was from the beginning of May to early June, spraying three to four times. The supplement control season was the last ten-day period of July to early August, which should be last to middle August, one time per 10～15 days.更多还原