Studies on biotypes of the brown and white-backed planthopperin ChinaandVietnam
Author of the article:HUANG Suo-Sheng1** HUANG Feng-Kuan1*** WU Bi-Qiu1 LONG Li-Ping2 LING Yan1
Author's Workplace：1. Guangxi Key Laboratory for Biology of Crop Diseases and Insect Pests, Institute of Plant Protection, Guangxi Academy of Agricultural Sciences, Nanning 530007, China;2. Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
Key Words：brown planthopper, white-backed planthopper, biotybe,China,Vietnam
Abstract： [Objectives] In order to provide guidance for breeding insect-resistant rice crops, biotypes of the brown and white-backed planthopper (BPH and WBPH) were investigated inChinaandVietnam. [Methods] Population group detection and honeydew quantity detection methods were used to study the virulence characteristics and the biotype structure of BPH and WBPH collected from Guangxi, Yunnan, Henan, Hunan, Chongqing and Guizhong in China, and Hanoi, Ha Tinh, Hue, Ho Chi Minh City and Song Cuu Long in Vietnam. [Results] BiotypeⅡwas comprised a greater proportion of BPH populations collected from the main rice planting areas inChinaand the central and northern parts ofVietnam. These BPH populations showed virulence to rice varieties with the Bph1 or bph2 gene. A greater proportion of BiotypesⅡ+Ⅲ was found in BPH populations collected fromSimao,China, and this population showed virulence, or strong virulence, to varieties with the Bph1 or bph2 or bph4 gene. A greater proportion of BiotypeⅡ+ Ⅲ was found in BPH populations collected fromHo Chi Minh Cityand Song Cuu Long inVietnam. These populations showed virulence, or strong virulence, to varieties with the Bph1, bph2, Bph3 or bph4 gene. A greater proportion of the BiotypeⅠgene was found in WBPH populations collected from different sites inChina. The largest proportion of the Biotype Ⅲ was found in populations collected fromHanoi, Ha Tinh andHueinVietnam. All WBPH populations were strongly virulent to rice varieties with the Wbph1 or Wbph2 genes, variable in virulence to varieties with the Wbph3 gene, and of moderate virulence to varieties with the Wbph5 gene. [Conclusion] Rice varieties with the Bph1 or bph2 gene should not be selected to breed plants resistant to BPH and varieties with the Wbph1 or Wbph2 gene should not be selected to breed plants resistant to WBPH.