Effect of flufenzine on population growth of Tetranychus urticae Koch (Acari: Tetranychidae)
Marcic, D.(Institut za istrazivanja u poljoprivredi Srbija, Beograd - Zemun (Serbia and Montenegro). Centar za pesticide i zastitu zivotne sredine)
Effect of flufenzine on different parameters of Tetranychus urticae Koch population growth was investigated. The parameters were computed based on the life tables of female survivors of treatment at different development stages (egg, larvae, protonymph, deutonymph) with acaricide concentrations that had caused or = 90% mortality. The intrinsic rates of increase acquired by the so-called Jackknife procedure (r(j)) from female treatment survivors at egg (r(j)=0.237) and larvae (r(j)=0.220) stages had no significant statistical difference from the corresponding values in control (r(j)=0.230). Female survivors of treatment at protonymph or deutonymph stages had 2.1 and 4.5 times lower net reproductive rate (Ro) against the control, while the corresponding r(j) values in treatment (0.204 and 0.171) were statistically significant lower than the control (0.255). Treatment with flufenzine at protonymph and deutonymph stages significantly disturbed the age structure of the surviving part of population. The article discusses the significance of sublethal effects of flufenzine in advancement of the acaricide's application strategy in controlling Tetranychus urticae.
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