夏季翦股颖果岭衰退防治.docVIP

Summer bentgrass decline:causes and cures 夏季匍匐翦股颖坪衰弱：原因与治疗 Identifying the causes of SBD is the key to using ‘best management’ practices to prevent or control the disease. 查明夏季匍匐翦股颖衰弱的原因，是找到“最好的管理”经验去预防和控制疾病的关键。 Creeping bentgrass Agrostis palustris ,a cool-season grass, grows vigorously in cool weather during spring and fall. During summer months, new root production slows, root dieback occurs and shoot growth declines, leading to a thin turf canopy. This problem has been called summer bentgrass decline SBD 2,7,8 . SBD is a common problem in creeping bentgrass greens in the transition zone. Attempts to extend the use of creeping bentgrass into more southern and warmer climatic regions have increased the occurrence of the problem. Many factors could contribute to SBD, including abiotic factors such as high temperature, high relative humidity, excessive soil moisture, poor air movement and poor soil aeration, and biotic factors such as diseases. 匍匐翦股颖是一种冷季型草种，在凉爽的春季和秋季生长非常旺盛。在夏季，新根生长放缓，根系发生枯萎，幼苗生长减低，导致草坪冠层变薄。这个问题被叫做夏季匍匐翦股颖衰弱。夏季匍匐翦股颖衰弱的问题广泛发生在过渡地带的匍匐翦股颖果岭上。匍匐翦股颖被尝试着应用到更加南方和温暖的气候地区，这导致了更多的问题发生。很多因素都会引发夏季匍匐翦股颖衰弱，包括非生物因素，如：高温、高相对湿度（高湿）、土壤过度潮湿、空气流通性差和土壤通气性差等。另外还有生物因素，如病害等。 Disease or physiological problem? 疾病或生理问题？ Over the years, there has been much confusion about whether SBD is a disease or a physiological problem. SBD has been described as a disease associated with high temperature and high relative humidity. Root and stolon rot diseases caused by species of Pythium and Rhizoctonia solani brown patch are said to be the major factors, but they may not be the primary factors causing SBD 7,8 . SBD has been attributed to a pathological problem based only on enhanced color and turf quality when summer-stressed grasses are treated with a mixture of Aliette Signature fosetyl aluminum with Daconil chlorothalonil or Fore mancozeb 3 . 这些年，关于夏季匍匐翦股颖坪衰弱是病害还是生理问题引起的，有很多争论。夏季匍匐翦股颖坪衰弱曾经被描述成高温高湿下的一种病害。由腐霉和丝核菌引起的根和匍匐茎腐烂被认为是主要原因。但是它们不是引起夏季匍匐翦股颖坪衰弱的根本原因。夏季匍匐翦股颖坪衰弱已被归为病理问题。当