Rongquan Lai, Hanqing Hu, Ting Zhou, Tianran Lin, et, al. Intercropping oilseed rape as a potential relay crop for enhancing the biological control of green peach aphids and aphid-transmitted virus diseases.[J]ENTOMOLOGIA EXPERIMENTALIS ET APPLICATA

  发布时间: 2020-05-25   信息员:   


Tobacco viruses transmitted by green peach aphids,Myzus persicae(Sulzer) (Hemiptera: Aphididae), cause severe disease in flue‐cured tobacco,Nicotiana tabacumL. (Solanaceae), in China and throughout the world. Field experiments were conducted in 2016 and 2017 in Longyan City, Fujian Province, China, to determine whetherM. persicaeand aphid‐transmitted virus diseases are affected by intercropping of oilseed rape,Brassica napusL. (Brassicaceae), in tobacco fields. The results showed that, compared with those in monocultured fields, the densities ofM. persicaeand winged aphids in intercropped fields significantly decreased in both 2016 and 2017. In particular, the appearance of winged aphids was delayed by ca. 7 days. Moreover, the densities ofAphidius gifuensisAshmead (Hymenoptera: Aphidiidae), a parasitoid of the aphid, significantly increased in 2016 and 2017. Accordingly, the incidence rates of aphid‐transmitted virus diseases (those caused by the cucumber mosaic virus, potato virus Y, and tobacco etch virus) significantly decreased in the intercropped fields in 2016 and 2017. Tobacco yields and monetary value significantly increased in 2016 (by 10–25 and 14–29%, respectively) and 2017 (by 17–22 and 22–34%, respectively). Consequently, our results suggest that intercropping oilseed rape in tobacco fields is a good approach to regulating and controlling aphids and tobacco mosaic viruses, for example potyvirus, and this intercropping can help control aphid‐transmitted virus diseases in tobacco.