Sublethal effects of some insecticides on the functional response of Aenasius bambawalei Hayat, 2009 (Hymenoptera: Encyrtidae) | Subletalni učinki nekaterih insekticidov na funkcionalen odziv vrste Aenasius bambawalei Hayat, 2009 (Hymenoptera: Encyrtidae)

English. Aenasius bambawalei Hayat, 2009 is one of the most effective natural enemies of Phenacoccus solenopsis Tinsley, 1898. The sublethal effects of dimethoate, imidacloprid, and thiodicarb on the functional response of A. bambawalei to different densities of third instar nymphs of P. solenopsis were evaluated under laboratory conditions. Young females were exposed to the insecticides and then introduced to the host densities of 2, 4, 8, 16, 32, and 64 for 24 h. The results revealed a type III functional response in control and insecticide treatments. The handling time and maximum attack rates of A. bambawalei females were adversely affected by insecticides. The longest handling time and the lowest value of maximum attack rate were observed in thiodicarb treatment, 5.03 h and 4.76, respectively. Therefore, for the simultaneous application of biological and chemical control of P. solenopsis, the influence of insecticides on the functional response behavior of natural enemies must be evaluated.

Slovenian. Vrsta Aenasius bambawalei Hayat, 2009 je najučinkovitejši naravni sovražnik škodljivca Phenacoccus solenopsis Tinsley, 1898. Subletalni učinki dimetoata, imidakloprida in tiodikarba na funkcionalni odziv vrste A. bambawalei na različne gostote nimf tretjega štadija škodljivca P. solenopsis so bili ovrednoteni v laboratorijskih razmerah. Mlade samice so bile izpostavljene insekticidom in nato prinešene gostitelju v gostotah 2, 4, 8, 16, 32, in 64 za 24 h. Rezultati so pokazali funkcionalni odziv tipa III pri kontroli in obravnavanjih z insekticidi. Na čas obravnavanja in največji napad samic vrste A. bambawalei so negativno vplivala obravnavanja z insekticidi. Najdaljši čas obravnavanja (5,03 h) in najmanjša vrednost maksimalnega napada (4,76) sta bila opažena pri obravnavanju s tiodikarbom. Zaradi tega moramo pri hkratnem biološkem in kemijskem uravnavanju škodljivca P. solenopsis predhodno ovrednostiti vpliv insekticidov na funkcionalni odziv naravnega sovražnika.