苹果须防棉铃虫棉铃虫系棉田的主要害虫之一，以蛀食棉铃及花蕾为害。年发生３—４代，若防治工作稍有疏忽则为害残重，已引起各级领导及专家的高度重视。由于棉铃虫在历史上对果树几乎不构成为害，故而未列入果树防治对象。近年来，随着果树面积的不断扩大，特别是苹果树... Apple should be against cotton bollworm Cotton bollworm is one of the main pests in cotton fields, to eat cotton bolls and buds harm. The occurrence of 3-4 generations in a year, if the prevention and treatment of a little negligence is the worst, has attracted great attention from leaders and experts at all levels. As the bollworm in the history of the fruit trees almost do not constitute harmful, it is not included in the control of fruit trees. In recent years, with the growing area of ​​fruit trees, especially apple trees ...