Investigations on the occurrence of Tersilochinae (Hyrn., Ichneumonidae) as purasitoids of oilseed rape pests in the Gottingen region in 1990 and 1991, and on their emergence following various tillage techniques In 1990 and 1991 the occurrence of Tersilochinae as larval parasitoids of the cabbage stem weevil, Ceutorhynchus palliductylus (Mrsh.), and the rape stem weevil, C. nupi Gyll., was studied in the Gottingen region. Additionally, parasitoids of the rape flea beetle, Psylliodes cbrysocephala L., and of pollen beetles (Meligetbes spp.) belongin to the same sub-family were registered in some samplings.In rearing experiments Terszlocbus ofscurutor Aub. was reared from field-collected larvae of C. pullidactylus. No parasitoids hatched from the larvae of C. nupi. Tersilochus miflogaster (Szep.) was reared from larvae of P. cbrysocepbalu; it was thus possible for the first time to designate this parasitoid species to a specific host.The rate of larval parasitism of C. palliductylus and C. nu i in 5 winter rape fields was investigated by dissecting larvae. Between 18.5 and 50.3 % of the C. pa$dartylus larvae were parasitized. Larvae that were trapped in water trays when migrating to the soil for pupation showed a higher rate of parasitism than larvae that were sampled from rape plants before migration. In the case of C. nupi, no larval parasitism was detected.In s ring 1991, the emergence of Tersilochinae in a winter wheat field following winter rape was assesselby using ground hoto-eclectors and yellow water traps. The total emergence of the different species occured from miiMarch to the end of May. Besides T. obscurutor and T. microgarter the pollen beetle parasitoids Tersilocbus beterocertrs Thorns., Phradis interstitiulis (Thorns.) and Phradis morionelfus (Holmgr.) were caught. Tersilocbus fulvipes (Grav.) which is known in the relevant literature as larval parasitoid of C. nupi was not detected in this area in either year.In a field experiment, various methods of soil tillage following the harvest of oilseed rape in autumn had a marked effect on the abundance of adult Tersilochinae emerging from the soil after hibernation. In 'no tillage";plots, the number of emerging parasitoids (478 ind./m2) was significantly higher than in plots subjected to tillage by "heavy cultivator" (193 ind./m2) and "plow/conventional" (137 ind./m2). In treatment ,,plow", in contrast to treatment ,,plow/conventional", no stubble cultivation by a rotary-harrow and, after plowing, no recompaction of the soil by a cultipacker was carried out. Following this treatment, 262 Tersilochinae/mz emerged. T. obscurutor was the predominant species in'all treatments.
Unlike chlorination fluorination of ammine complexes of platinum(IV) in aqueous solution does not lead to haloamido complexes. Instead, the triammine complexes [Pt(NH3)3Cl3]Cl and [Pt(NH3)3(NCl2)2Cl]Cl yield no definite main product, and the tetrammine and pentammine complexes trans-[Pt(NH3)4C12]C12, [Pt(NH3)4(NCl2)Cl]Cl2, [Pt(NH3)5Cl]Cl3, and [Pt(NH3)5(OH)]Cl3 form the sparingly soluble complex trans -[Pt (NH3 )4C12] (H2F3 )2 • 2 H-20 as the main product.
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