Time-dose-mortality Model of Isaria fumosorosea against Bemisia tabaci (Homoptera : Aleyrodidae)
TIAN Jing
TIAN Haokai
DIAO Hongliang
FU Shuhui
HAO Chi
MA Ruiyan
Abstract：In order to effectively control Bemisia tabaci,the virulence of Isaria fumosorosea IF-1106 isolate against different instars of B.tabaci was evaluated by immersing leaves.Results showed that all states of B.tabaci could die after infection of I.fumosorosea.Under the treatment of I.fumosorosea conidial suspension with the concentration of 1.0 × 107,5.0 × 106,1.0 × 106,5.0 × 105,1.0 × 105 cfu/mL,the accumulative adjusted mortality of B.tabaci increased with rise of concentration of the conidia and elongation of action time.The accumulative adjusted mortality of 2nd instar larvae was the highest among all instars,which reached 83.05％ after 7 days of treatment by 1.0 × 107 cfu/mL.A time-dose-mortality model conforming to Hosmer-Lemeshow goodness-of-fit test was established to estimate the lethal dose and lethal time of Isaria fumosorosea IF-1106 against B.tabaci.With the extension of time,the dose effect increased,LD50 and LD90 decreased.The estimated LD50 logarithm of 2nd instar larvae on the 7th day after treatment was 4.37.The time effect was negatively correlated to the dose,and the LT50 values of 2 nd instar larvae decreased from 5.66 d to 4.47 d with the increase of the concentration in the range of 1.0 × 105-1.0 × 107 cfu/mL.I.fumosorosea IF-1106 has high pathogenicity to the 2nd instar larvae,and is promising in the biological control of B.tabaci.
Keywords：Isaria fumosoroseaBemisia tabacipathogenicitytime-dose-mortality modelbiological control
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 70-75 )