Time-dose-mortality modelling and virulence indices for six strains of Verticillium lecanii against sweetpotato whitefly, Bemisia tabaci (Gennadius)
文献类型： 外文期刊
作者： Wang, L 1 ; Huang, J 2 ; You, M 2 ; Liu, B 2 ;
作者机构： 1.Univ Gottingen, Inst Plant Pathol & Plant Protect, D-37077 Gottingen, Germany
2.Univ Gottingen, Inst Plant Pathol & Plant Protect, D-37077 Gottingen, Germany; Fujian Agr & Forestry Univ, Key Lab Pesticide Biochem, Minist Educ, Fuzhou, Peoples R China; Fujian Acad Agr Sci, Ctr Biotechnol, Fuzhou, Peoples R China
关键词： Verticillium lecanii;Bemisia tabaci;bioassays;complementary log-log modelling;time-dose-mortality;virulence
期刊名称：JOURNAL OF APPLIED ENTOMOLOGY （ 2020影响因子：2.603； 五年影响因子：2.562 ）
ISSN： 1439-0418
年卷期： 2004 年 128 卷 7 期
收录情况： SCI
摘要： Bioassays of six strains of Verticillium lecanii (Zimmermann) Viegas were conducted with the sweet potato whitefly, Bemisia tabaci. For inoculation, batches of third-instar whitefly nymphs on sweetpotato seedlings were immersed in conidial suspensions of five dosages at concentrations from 10(3) to 10(7) conidia/ml. Each dosage was used to inoculate 150-250 nymphs. The nymphs were maintained at 25degreesC, under 95% RH, photo phase of 16 : 8 (L : D) and observed daily for mortality. The resulting data were analysed over 8 days by a complementary log-log (CLL) time-dose-mortality model, based on the Hosmer-Lemeshow test, analysing the time-dose trends for five concentrations of six strains of V. lecanii simultaneously. The parameters from the model were used to estimate the virulence indices (the values of LC50) of six strains against B. tabaci. Based on the time-dose-mortality relationships fitted and the virulence indices, the virulence of the six strains of V. lecanii for B. tabai was compared. Results indicated that the strain Vl6063 imported from Canada and the domestic strains V3450 and Vp28 derived from B. tabaci and a scale insect, respectively, were more virulent than the others with LC50 values of 2.57 x 10(5), 6.03 x 10(5) and 6.03 x 10(5), respectively.
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