HOST SPECIFICITY IN WEED BIOCONTROL
作者单位：Agriculture＆Agri-Food CanadaLethbridge Research CentrePO Box 3000LethbridgeABCanadaT1J 4B1
会议名称：《The 18th Asian-Pacific Weed Science Society Conference》
会议日期：2001年
关 键 词：Host range no-choice tests supplementary tests
摘 要：正Host range determination is essential to exclude release of weed biocontrol agents harmful to desirable *** this is largely based on host range surveys in the native region and lack of larval development in no-choice *** 10%of the agents established in Canada have no-choice host ranges narrower than the field range, 20%are the same and 70%are *** 90%of those in the last category developed in no-choice test on North American plants closely related to the host;but only 4%have attacked them in the *** native flora is a sensitive issue so there is an urgent need to identify which are actually at risk.A combination of the native field host range and no-choice test limits risk to a plant *** releasing agents that develop on critical plants in the taxon eliminates most biocontrol *** strategies less destructive to weed biocontrol are suggested for achieving the same end.1) Extend the host range surveys to determine the candidates physical and biological needs.2) Restrict release to candidate agents not accepting the critical plants in native-region field tests.3) Determine risk from the relative suitability of critical plants to the host.4) Reject candidates if host finding or acceptance of critical plants is *** strategies are not mutually exclusive.