Smith H A, Giurcanu M C
University of Florida, Gulf Coast Research and Education Center, Wimauma FL 33598
University of Florida, Department of Statistics, Gainesville, FL, 32601.
J Insect Sci. 2014 Jan 1;14:183. doi: 10.1093/jisesa/ieu045. Print 2014.
Greenhouse studies using a randomized complete block design were carried out to evaluate the effect of six insecticides on transmission of Tomato yellow leaf curl virus (TYLCV) by the silverleaf whitefly, Bemisia tabaci biotype B Gennadius (Hemiptera: Aleyrodidae) to tomato, Lycopersicon esculentum (Miller) (Solanales: Solanaceae), seedlings that were inoculated with whiteflies from a TYLCV colony in cages 3, 7, or 14 d after treatment with insecticide. The purpose was to reveal differences in residual efficacy of four materials that are nearing registration for use on tomato-cyazypyr, flupyradifurone, pyrafluquinazon, and sulfoxaflor-and to compare them with two established insecticides, pymetrozine and a zeta-cypermethrin/bifenthrin combination. Differences in efficacy were expected because these six materials represent five distinct modes of action and both contact and systemic materials. Percentage of tomato seedlings expressing virus symptoms tended to be lowest in seedlings treated with flupyradifurone. The zeta-cypermethrin/bifenthrin insecticide demonstrated comparable efficacy to flupyradifurone in some trials at 3 and 7 d after treatment inoculations, but not the 14 d after treatment inoculation. Pyrafluquinazon was not statistically different from cyazypyr or sulfoxaflor in percentage of plants with virus symptoms in any trial. Percentage virus in the cyazypyr and sulfoxaflor treatments was not statistically different in the 3 and 7 d after treatment inoculations. Among seedlings treated with insecticide, percentage with virus symptoms tended to be highest in the seedlings treated with pymetrozine.
采用随机完全区组设计进行温室试验，以评估六种杀虫剂对烟粉虱生物型B（Bemisia tabaci biotype B Gennadius，半翅目：粉虱科）向番茄（Lycopersicon esculentum (Miller)，茄目：茄科）幼苗传播番茄黄化曲叶病毒（TYLCV）的影响。在杀虫剂处理后3、7或14天，用来自TYLCV种群的粉虱接种番茄幼苗。目的是揭示四种即将登记用于番茄的药剂（溴氰虫酰胺、氟吡呋喃酮、吡蚜酮唑和氟啶虫胺腈）的残留药效差异，并将它们与两种已有的杀虫剂（吡虫啉和高效氯氰菊酯/联苯菊酯组合）进行比较。由于这六种药剂代表了五种不同的作用方式以及触杀型和内吸型药剂，预计它们的药效会有所不同。在使用氟吡呋喃酮处理的幼苗中，表现出病毒症状的番茄幼苗百分比往往最低。在处理接种后的3天和7天的一些试验中，高效氯氰菊酯/联苯菊酯杀虫剂表现出与氟吡呋喃酮相当的药效，但在处理接种后的14天则不然。在任何试验中，有病毒症状的植株百分比方面，吡蚜酮唑与溴氰虫酰胺或氟啶虫胺腈没有统计学差异。在处理接种后的3天和7天，溴氰虫酰胺和氟啶虫胺腈处理中的病毒百分比没有统计学差异。在使用杀虫剂处理的幼苗中，用吡虫啉处理的幼苗中表现出病毒症状的百分比往往最高。
