麦蚜远距离迁飞和传毒规律的研究

本文围绕麦蚜及黄矮病毒在我国北部春麦区越冬及初侵染源问题,提出麦蚜凭借气流携带远距离迁飞传毒,从而使冬春麦区黄矮病发生流行具有联系的结论。文章着重从外来虫源迁飞入境所具有的特征、迁入翅蚜数量消长与天气形势的密切关联等加以分析论证。在此基础上划分了翅蚜的迁出与迁入区域,并通过预测预报的实践,检验了这一发生流行规律的真实性。

STUDIES ON THE LONG-DISTANCE MIGRATIONOF AND VIRUS TRANSMISSION BY THE APHID SITOBION AVENAE (F.)

The present article deals with the overwintering of the aphid Sitobion avenae (F.) and the source of wheat yellow dwarf virus (WYDV) in the spring wheat area in the northern China.WYDV and its aphid vectors could not overwinter in the spring wheat area.In all instances,it is the alate of the aphid first trapped or observed in the field.Before that there were not any other forms of aphid found in the field.The dense population of the winged form increased suddenly in a big area at a short time. Among them,a few has been identified as viruliferous.An analysis of weather record showed that weather features especially the low-level jet winde favor particularly for aerial transport of the aphid to a long-distance.As a result,we suggested that the initial aphid vectors and source of WYDV in the spring wheat area come from the winter wheat area with a latitade of 35°N or so.This finding might be valuable for foreasting and controlling of aphid vectors and wheat yellow dwarf virus disease in the spring wheat area.