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VCRB :: Contents of Volume 52/2000 :: Detailed information


Miclos NADASY1, Gyula. SARINGER 1, Attila LUCSKAI1, A. FODOR2, Z. SAMU2 J. IGNACZ1, Cs. BUDAI3, and M. KLEIN4
1Pannon University of Agricultural Sciences, Georgikon Faculty of Agriculture, Keszthely, Plant Protection Institute M-83-60, Keszthely, Deak Ferenc str. 57 (Hungary) 2 Eotvos L6rant University, Department of Genetics (Hungary) 3 Csongrad County Station of Plant Hygiene and Soil Conservantion (Hungary) 4 Ohio University, Research Institute ofWooster (Ohio, USA)


Co-operative studies on the effect of some entomopathogenic nematodes on selected phytophagous species as: Leptinotarsa decemlineata, Melolonthidae spp. and Noctuidae spp. has included following nematode species; Heterorhabditis bacteriophora HH, Heterorhabditis bacteriophora Cserszeg collected in Hungary and Heterorhabditis bacteriophora /USA/, Steinernema feltiae 1048, Steinernema feltiae 1052, Steinernema feltiae A4, Steinemema glaseri from the American BIOSYS company. It was found that the entomopathogenic nematodes can be successfully used under laboratory conditions at higher concentrations (1000 nematodes/ml) against the larvae of insect pests living in the soil, since the mortality of the latter was found to come close to 100%. Out of the two methods tried, foliar spraying proved to be better, as it gave a nearly 100% efficacy. When the nematodes were sprayed over the soil the mortality percentage was only about 90%. In insectary where the mass of the infected soil was larger, any considerable result could only be produced with a higher concentration of nematode (10000 JJ/ml). The entomopathogenic nematodes did not immediately destroy the larvae in the soil. Any considerable mortality was only experienced after a week. In case the nematodes were applied onto the plants, mortality of the larvae occurred sooner. This fact must be taken into consideration in practice, mainly for the control of pests (Mamestra brassicae, Pieris brassicae ) causing serious damages in a short time. Steinernema species proved to be more effective than the Heterorhabditis species. Out of Heterorhabditis species Heterorhabditis bacteriophora HH and Heterorhabditis bacteriophora Cserszeg strains gave better results than the species originating from the USA, which may suggests that the use of nematodes having adapted themselves to the specific ecological conditions may have a better chance than when species originating from abroad are used in plant protection in Hungary. The success of pest control with entomo-pathogenic nematodes is greatly influenced by the moisture content of the soil. It is therefore recommended to use them only in places where a regular irrigation of the soil is possible.

keywords:entomopathogenic nematodes, Steinernema spp., Heterorhabditis spp., Helicoverpa armigera, Pieris brassicae, Mamestra brassicae, Melolontha melolontha, Scotia segetum

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