我国部分地区鲜食辣椒及其加工品中辣椒轻斑驳病毒的调查

本研究利用RT-PCR技术对我国部分地区鲜食辣椒和辣椒加工品中的辣椒轻斑驳病毒Pepper mild mottle virus(PMMoV)进行了调查。其中,鲜食辣椒样品(249份)中PMMoV检出率为75.5%;147份辣椒加工品中有97份检测到PMMoV,且所采集的每一类别的辣椒制品中都有阳性样品。调查结果表明:PMMoV不仅广泛分布于我国辣椒种植区,而且在多种辣椒加工品中的检出率也较高。该研究进一步明确了PMMoV的来源及可能的传播途径,为该病毒的防控提供了理论依据。

The survey of Pepper mild mottle virus in pepper and processed products in China

To understand the resistance of different populations of white-backed planthopper (WBPH), Sogatella furcifera (Horváth) to commonly used insecticides and its development trends in Yunnan Province, field populations of planthoppers were collected from Cangyuan, Menghai and Shizong cities, and their resistance to five insecticides was tested using rice stem dipping method from 2012 to 2015. The three populations of WBPH showed low to middle levels of resistance to the five insecticides with resistance ratios of 0.9-23.4. Among the five insecticides tested, the WBPH showed a relatively stable middle resistance to chlorpyrifos. The Cangyuan and Menghai populations showed 11.0- and 23.4-fold resistance to buprofezin in 2012, respectively, but dropped to 4.6- and 7.5-fold, respectively in 2015. The highest resistance ratios of three WBPH populations to imidacloprid, pymetrozine and thiamethoxam were 7.2, 6.5 and 5.5-folds, respectively, indicated susceptible or low resistance in this four years. Resistance of three WBPH populations to the five insecticides varied from 2012 to 2015 but not significantly. Both buprofezin and chlorpyrifos have been widely sprayed, so the WBPH has developed middle resistance to them.Therefore we suggested to limit the use of these two insecticides by rotating with or changing to other insecticides showed no cross-resistance.