Effects of the juvenoids fenoxycarb, hydroprene, kinoprene and methoprene on first instar larvae of Epidiaspis leperii Sign. (Hom., Diaspididae) and on its ectoparasitoid, Aphytis mytilaspidis (Le Baron) (Hym., Aphelinidae)
1988
Abd El-Kareim, A.I. (Budapest Univ. (Hungary). Plant Protection Inst.) | Darvas, B. | Kozar, F.
Fenoxycarb, hydroprene, kinoprene and methoprene have been sprayed on Epidiaspis leperii and its ectoparasitoid, Aphytis mytilaspidis. These juvenoids (JHAs) were applied at the time of the peak in larval migration of E. leperii and when the second generation of A. mytilaspidis larvae were overwintering on E. leperii females. First instar male larvae were more sensitive to JHA than female larvae. At a concentration of 0.1 a. i. per cent all the JHAs tested showed a similar efficacy (82-85 per cent) against E. leperii larvae. The rate of parasitization was not affected by the lower concentrations of JHAs used, but at the high concentration they decreased parasitism. At a concentration of 0.5 a. i. per cent, hydroprene, methoprene and kinoprene disturbed the development of A. mytilaspidis. At a concentration of 0.1 a. i. per cent fenoxycarb and methoprene did not affect the percentage parasitism
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