Journal of Applied Entomology - Zeitschrift für angewandte Entomologie (1995) 119, 227-232
U. Quentin, M. Hommes and Th. Basedow (1995)
Untersuchungen zur biologischen Bekämpfung von Blattläusen (Hom., Aphididae ) an Kopfsalat im Unterglasanbau
[Studies on the biological control of aphids (Hom., Aphididae) on lettuce in greenhouses]
Journal of Applied Entomology - Zeitschrift für angewandte Entomologie 119 (1), 227-232
Abstract: From March to September, 1992, the efficiency of Aphidius matricariae Haliday, Aphidoletes aphidimyza (Rondani) and Chrysoperla carnea (Stephens) in controlling aphids on lettuce in glasshouses was tested. The following aphid species, entering through the ventilation apertures, occurred in the greenhouse chambers: Aulacorthum solani (Kaltenbach) (75%), Macrosiphum euphorbiae (Thomas) (12%), Nasonovia ribisnigri (Mosley) (2%), and - late in the season only - Myzus persicae (Sulzer) (11%). Aphidius matricariae proved to be useless for controlling aphids on lettuce; A. solani and N. ribisnigri were not shown to be host species for this parasitoid, and oviposition of A. matricariae into specimens of M. euphorbiae was very rare. Indeed, A. matricariae is an excellent parasitoid of M. persicae, but, in these experiments, this aphid was of minor importance as a lettuce pest. Aphidoletes aphidimyza did not control the aphids under the climatic conditions common in greenhouses for growing lettuce, even if pupae of the predatory midge had been applied three times. Of the species tested, only the application of Chrysoperla carnea (eggs) resulted in reasonable aphid control. The best effects from this predator were achieved when eggs were first added to the young lettuce plants before transplanting, subsequently followed by three sprayings of Chrysoperla eggs at weekly intervals (25-30 eggs per m2 ). A method of spraying stem-less Chrysoperla eggs, suspended in water plus detergent, on 500 to 1000 m2 by compressed air are developed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: German)
Link to article at publishers website
Database assignments for author(s): Martin Hommes, Thies Basedow
Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection
application technology
