本试验采用对样枝分级，且不断更替的取样方法，进行了14个月的月季黑斑病流行的系统调查。
The epidemiological aspect of rose blackspot was investigated systematically for 14 months by means of grading and replacing of branch samples.
通过五点取样法，对病虫害进行分级和定点定株调查。
The investigation was made by sampling in five locations for diseases and pests.
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