As they are very prone to blackspot, spraying is necessary.
因为它们很容易受黑斑病侵害，所以必须喷药。
The blackspot shown in the photos was caused when molding the white base of the nozzle.
照片中显示的黑点是注塑喷嘴的白底座时造成的。
The epidemiological aspect of rose blackspot was investigated systematically for 14 months by means of grading and replacing of branch samples.
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。
During the starting process, due to the injection mould machine demoulding, carbonizing materials mixed into the injection materials of white base to form the blackspot in the picture.
在开机过程中，由于注塑件的脱模，碳化的物料混入白底座的注塑料内，造成了照片中的黑点。
During the starting process, due to the injection mould machine demoulding, carbonizing materials mixed into the injection materials of white base to form the blackspot in the picture.
在开机过程中，由于注塑件的脱模，碳化的物料混入白底座的注塑料内，造成了照片中的黑点。
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