冀东地区小麦长管蚜及其寄生蜂种群动态

Population Dynamics of Sitobion avenae(Fabricius) and It's Parasitoids in the Fields of Wheat of Eastern Hebei Province

于2014年3月25日至6月10日对秦皇岛地区麦长管蚜及其寄生蜂的田间种群动态进行了调查,探讨麦长管蚜种群的发生规律及其寄生蜂的种类和数量动态。调查结果表明:在4月1日(此期为小麦返青期)麦长管蚜开始发生,此时百株有翅麦长管蚜的数量达到49.5头,百株无翅麦长管蚜的数量达到125.0头;而后急剧上升,在5月13日(此期为小麦抽穗期)麦长管蚜达到最高峰,此时百株麦长管蚜的数量为1 172.5头,发生程度为二级;而后百株蚜量急剧下降,至6月3日(此期为小麦乳熟末期),百株麦长管蚜的数量降到了0.0头。通过鉴定,麦长管蚜的初寄生蜂主要有2种,均属于蚜茧蜂属;重寄生蜂有2种分别为金小蜂属1种、宽缘金小蜂属1种。

Population dynamics of Sitobion avenae（Fabricius）and it＇s parasitoids were investigated in Qinhuangdao from March 25 th to June 10 th of 2014. The results showed that population of winged aphids was reach on 49.5 per one hundred plants of wheat, the number of wingless aphids was 125 per one hundred plants in April 1st. However, in May 13 th aphids＇ population was up to1 172.5per one hundred plants. At present, harm level of aphids was reached the second standard. Then, aphids＇ population was decreased,and in June 3th aphids disappeared. The kinds of parasitoids were Aphidius sp1, Aphidius sp2, Asaphes sp, Pachyneuron sp by identification.