一、葡萄主蔓光秃的原因:葡萄多年生主蔓中后部经常出现无新梢的光秃现象,严重影响产量。主要原因有: 1.冬季修剪中对主蔓和主蔓延长枝剪留过长,特别是定植的当年,如果主蔓不剪或剪留过长,主蔓的延长枝和附近部位的新梢,由于受顶端优势的影响而生长过旺,主蔓中下部的 First, the main grape vine bare reasons: vine perennial main vine in the back often without bald phenomenon, seriously affecting the yield. The main reasons are: 1. Winter pruning of the main vine and the main branch to extend the extension of pruning too long, especially when planting, if the main vine does not cut or cut too long, the main branch to extend the branches and the vicinity of the shoot , Due to the top edge of the growth of excess, the main vine in the lower part