一、蔗区自然条件与病害的关系云南蔗区主要分布在东南、西南和北部沿江河谷及坝地,属热带、亚热带地区,土壤肥沃,作物复种指数较高。由于我省地形复杂,广大蔗区气候类型也较复杂,大致分为燥热和湿热两大类。其共同点是:年较差小,日较差大;冬春干旱,夏秋多雨。 First, the sugarcane natural conditions and disease relationship Yunnan sugarcane mainly distributed in the southeast, southwest and north along the river valley and dam, a tropical, subtropical region, fertile soil, crop multiple crop index higher. Due to the complicated terrain of our province, the climate types of the vast sugar cane areas are also more complicated, which are roughly divided into two categories: hot and humid. Their common ground is: the year is small, the daily difference is big; winter and spring drought, summer and rainy.