巧治冀北山区的黑核桃核桃是一种经济价值很高的果实兼木材两用树种，尤其是它的营养价值高，医疗作用大，倍受广大消费者欢迎。但近年来由于黑核桃的为害，使得冀北山区的核桃树连年减产，甚至绝产，为此作了调查及防治试验。１生活史黑核桃又名核桃黑，实质是由于核桃举... Qiaozhi Jibei mountain black walnut is a fruit of high economic value and dual-purpose timber species, especially its high nutritional value, medical role, much of the vast number of consumers. However, due to the damage of black walnut in recent years, the walnut trees in the mountainous areas of northern Hebei have been reduced or even cut off year by year, and investigations and prevention and control tests have been conducted. A history of life Black walnuts, also known as walnut black walnut essence is due to ...