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2013年襄阳市稻飞虱发生情况复杂,田间虫量差别悬殊、区域差异极大,呈现出前期(3代)偏轻,后期(4代)偏重;东北部偏轻,西南部偏重;白背飞虱偏轻,褐飞虱偏重的发生特点。分析原因,气候条件是关键影响因素。台风对稻飞虱的迁入影响明显,夏季异常高温、持续干旱抑制了3代稻飞虱的发生,入秋早,有利于第4代稻飞虱的暴发,阵性降雨和灌溉条件的差异是造成稻飞虱发生区域差异大的主要影响因素。此外,后期迁入虫量大,褐飞虱比率高,是导致4代稻飞虱暴发的内因。
In 2013, the occurrence of planthoppers in Xiangyang was complex and the difference in field insects was very wide. There were great differences in the fields. The first generation (3rd generation) was light and the latter (4th generation) was heavier. The northeast was light and the southwest was heavier. Slightly lower levels of planthopper, brown planthopper biased occurrence characteristics. Analysis of the reasons, climatic conditions are the key influencing factors. Typhoon had a significant impact on the migration of planthoppers, the unusually high temperature in summer and the continuous drought inhibited the occurrence of the third generation of planthopper, and the fall of the first generation of planthoppers was conducive to the fourth generation of planthopper outbreak, It is the main influencing factor that causes the large difference of planthopper occurrence area. In addition, the late immigration into the large amount of insect, brown planthopper high rate is the fourth generation of rice planthopper outbreak of the internal causes.