虫口基数、小麦品种和降水对麦红吸浆虫危害程度的影响

为明确虫口基数、小麦品种和降水对麦红吸浆虫危害程度的影响。2013年和2014年,在陕西周至县选择4块麦田,调查分析麦红吸浆虫春季虫口基数、成虫发生量与小麦品种受害指标的关系及降雨量与各虫态种群变化的关系。结果表明,不同年份间,小麦粒被害率和单穗幼虫数与虫口基数无明显相关性,主要受当年3-5月上旬降雨量的影响;2014年雨量多,幼虫出土率显著较高,成虫发生和小麦受害明显严重。相同年份,不同田块小麦受害程度主要受小麦品种影响,无论当年虫口基数多寡,2a试验期间均以小偃22受害最严重,单穗幼虫数和粒被害率显著较高,其次为西农979,渭丰151和郑麦9023受害相对较轻。

Effects of Initial Population Number,Wheat Varieties and Precipitation on Infestation of Sitodiplosis mosellana (Diptera:Cecidomyiidae)

The aim of study is to clarify the effects of initial population number,wheat varieties and precipitation on infestation of Sitodiplosis mosellana (Diptera: Cecidomyiidae),and to provide a scientific guidance for control it. Relationship between infestation caused by S.mosellana and number of initial population in early spring and adults in four wheat fields in Zhouzhi County,Shaanxi,China were investigated in 2013 and 2014,and effect of precipitation on population dynamics and infestation were analyzed from March to May in two years. Percentage of infested grains,infested ears and larval number per ear in different wheat varieties were compared. The results showed that percentage of infested grains and larvae number per ear had no significant relationship with initial population number in different years. They were mainly affected by precipitation during March to early May. Significantly higher percentage of larvae exiting from soil,more serious degree of adult occurrence and larvae infestation in 2014 had relationship with higher precipitation. Infested degree of wheat in different fields within year was mainly affected by wheat varieties. Regardless of initial population number,Xiaoyan 22 was the most susceptible among wheat varieties. It had significantly higher percentage of infested grains and larvae number per ear than than of Zhengmai 9023 and Weifeng 151 and was followed by Xinong 979.