The insecurity of production quality is the major constraint for vegetable production development in hezhou ; 4 . the major reason of the major constraint is that the farmers lack of awareness of improving production quality and ipm knowledge ; 5 4 、病虫害严重、菜农缺技术和不合理使用农业投入品尤其是高毒高残留农药是造成贺州市蔬菜产品质量安全问题突出的主要原因。
