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核桃黑在我县发生40多年,有些村成沟连片100%的黑净,全县每年至少损失100多万斤核桃,产量逐年下降,过去人们一直认为是天年、神虫,没办法治。因此,群众对栽培核桃失去了信心,影响了果树的发展。党政领导上决心要为山区人民解除这块心病,于1956年开始访问搜集材料,点片观察了解1957年固定专人常年进行试验观察、药效测定等不同
Walnut black occurred in my county for 40 years, some villages into ditch contiguous 100% black net, the county lost at least 1000000 kilograms of walnuts each year, the output declined year by year, people have always thought it was a god, insects, no way to rule . Therefore, people lost confidence in the cultivation of walnut, affecting the development of fruit trees. Party and government leaders determined to lift this piece of heart disease for the people in the mountainous areas. In 1956, they began to visit the collection of materials and observed some of the differences between 1957 fixed perennial experimental observation and measurement of pharmacodynamics