摘要
2008年4月底至6月初在山东禹城调查了小麦和3种牧草上的蚜虫和天敌种群密度。结果表明,麦蚜种群高峰期在5月中旬,寄生蜂和瓢虫的高峰期比蚜虫分别滞后5～10d和15～20d;麦蚜种群增长率与天敌种群密度变化呈负相关,其中与瓢虫的相关性达到显著水平;4月底至5月初小麦抽穗期是麦蚜种群爆发的关键时期,天敌密度低、害益比大是爆发的重要原因;4月底至5月初,牧草上的天敌密度是小麦上的2～3倍。牧草在麦蚜种群生态调控中具有潜在应用价值。
Multi-population dynamics of aphids and natural enemies on winter wheat, alfalfa, perfoliate rosinweed and wintergrazer-70, were investigated in Yueheng City, Shandong Province of China. The resuits indicated that ： the peak of multi-population of wheat aphids was in middle May, while that of parasitoids and lady beetles had time lags of 5 -10 d and 15 -20 d respectively; population growth rate of wheat aphids was negatively correlated with natural enemy population densities, and the correlation with lady beetle population density was significant; the heading stage of winter wheat from late April to early May was a key period for outbreak of wheat aphid population which was mainly caused by the low density of natural enemies and large ratio of prey and predator; from late April to early May, the enemy population density on forage was 2 - 3 times higher than that on winter wheat, which implied a potential application of forage to the ecologically-based management of wheat aphids.
出处
《环境昆虫学报》
CSCD
2008年第4期325-330,共6页
Journal of Environmental Entomology
基金
中国科学院<耕地保育与持续高效现代农业试点工程>项目(KSCX1-YW-09-06)
中国科学院知识创新重要方向项目(KSCX2-YW-N-42)
国家科技支撑计划课题(2008BADA5B05)
关键词
麦蚜
天敌
小麦
牧草
种群动态
wheat aphid
natural enemy
wheat, forage
population dynamic
