Göttig, S.

Herz, A.

English

JKI Open Journal Systems (Julius Kühn-Institut)

Nachwuchswissenschaftlerforum / Young Scientists Meeting 2012 Göttig and Herz 12 Berichte aus dem Julius Kühn-Institut 167. 2012 Eco-friendly regulation of the box tree pyralid, especially with entomopathogenic nematodes  Göttig, S.1, Herz, A. 1  1 Julius Kühn-Institute, Federal Research Centre for Cultivated Plants, Institute for Biological Control Email of corresponding author: Stefanie.goettig@jki.bund.de  The box tree pyralid Cydalima perspectalis (Walker 1859) is an invasive alien moth from East Asia which occurs in Central Europe since 2007. It is an insect pest on plants of the genus Buxus, causing serious damage. Because of the rapid spread in Germany and nearby countries like Switzerland, one part of this study was testing different ways of eco-friendly regulation with commercially available beneficials and biological control agents.  In addition to host acceptance and search performance tests with Trichogramma wasps in the laboratory, the susceptibility of C. perspectalis larvae to three entomopathogenic nematode (EPN) species was investigated by using a bioassay system. Steinernema carpocapsae was the most effective nematode which produced mortalities ranging from 80 to 100% at four concentrations (25, 50, 100, 200 EPN/larvae). Also Steinernema feltiae produced high mortalities, whereas the treatment with Heterorhabditis bacteriophora only low mortality rates brought forth. The investigation of the infectivity of various larval instars (2nd and 4th) by S. carpocapsae demonstrated a mortality of 100% at 50, 100 and 200 EPN/larvae for both larval instars. On the other hand entomopathogenic nematodes are not effective against pupae of C. perspectalis. The susceptibility of C. perspectalis larvae under natural conditions in the laboratory was carried out on box trees. After application of S. carpocapsae with a pressure sprayer could be shown a mortality of 95%, despite the formation of type-specific webs. One experiment was applied to determine the persistence of S. carpocapsae on the foliage of box trees. After the application in the field, treated branches where sampled and fed to C. perspectalis larvae, followed by incubation in the laboratory. Even after 16 h of exposure, the resulting rate of insect mortality was 95%. First field experiments on infested box hedges were carried out with S. feltiae. The experiments point out free-eating larvae generally can be infected and above all, larvae in winter cocoon are not susceptible to infection.  This study has shown that under laboratory conditions S. carpocapsae is a suitable biological control agent for C. perspectalis, but the experimental conditions in field such as the time of application and the application rates used to be optimized.

Eco-friendly regulation of the box tree pyralid, especially with entomopathogenic nematodes

https://ojs.openagrar.de/index.php/BerichteJKI/article/download/2038/2418

Eco-friendly regulation of the box tree pyralid, especially with entomopathogenic nematodes

Abstract

Similar works

Full text

Available Versions

JKI Open Journal Systems (Julius Kühn-Institut)