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过去,对药剂防治杂交制种稻粒黑粉病的效果,是用减低病粒的百分率作为衡量标准,有的辅以增力口的粒重来强化防效。由于杂交制种稻存在不育系恢复力的强弱,父母本花期花时相遇的好差,母本花柱外露率的高低,以及花期使用调花激素等特殊问题,在花期用药防治粒黑粉病,对病粒、健粒、实粒、包颈粒所占的比例以及对千粒重增减,均产生不同程度的影响,仅用减少病粒的百分率来表示防治效果,实际上只重视了药剂防治的正效应,而忽视了药剂对结实、粒重、包颈粒可能产生的负效应,显然不能客观地反映药剂防治的实际效益,在筛选
In the past, the effect of hybrids on the prevention and treatment of rice grain powdery mildew was to reduce the percentage of sick grains as a measure, and some supplemented by grain weight increase mouth to strengthen the control effect. Due to the existence of hybrid rice restorer resilience of the strength of the parents of the flowering of the time to meet the poor, the mother of the pattern of the rate of exposure, and the flowering of the use of turantin and other special problems in the florescence prevention and treatment of grain black powder Disease, the proportion of sick grain, healthy grain, solid grain and neck-covered grain, as well as the increase and decrease of 1000-grain weight, all have different degrees of impact. Only the percentage of reducing the grain is used to indicate the prevention and treatment effect, in fact only the medicine Prevention and treatment of positive effects, while ignoring the agent on the solid, grain weight, including neck negative possible effects, obviously can not objectively reflect the actual effectiveness of chemical control in the screening