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Control experiments on the nun moth (Lymantria monacha L.) by nuclear-polyhedrosis virus in Danish coniferous forests



Control experiments on the nun moth (Lymantria monacha L.) by nuclear-polyhedrosis virus in Danish coniferous forests



Zeitschrift fur Angewandte Entomologie 81(2): 192-207



Outbreaks of the nun moth, Lymantria monacha seriously affected coniferous forest stands, totalling some 350 ha in 3 different localities of Denmark 1971-74: Silkeborg and Grindsted in Jutland, and Ellet in Funen. These fluctuations followed a lapse of 70 yr since the last reported outbreak. Nun moth nuclear-polyhedrosis virus (NPV) harvested in Sweden and West Germany was applied from helicopter on 15 ha at Silkeborg in 1973. The NPV-treatment resulted in 90% mortality, half of which occurred in the larval and half in the pupal stage. The kill was too late to protect younger trees during 1973, and many trees, in particular Abies grandis, died after defoliation. In 1974 no significant damage was observed in the virus-treated stands in contrast to other parts of the forest where chemical control applications had to be arranged in order to avoid great losses. The populations in Grindsted also succumbed almost totally in 1974. Although the causes for this break-down are rather uncertain, there are reasons to believe that indigenously developed virus bears part of the responsibility. Collection of virus-killed larvae from tree tops was not very profitable at Silkeborg, as the regain of polyhedra was only 10% of the polyhedra sprayed. An attempt to collect living, but virus-infected larvae from lower parts of the canopies showed this method to be even less profitable than collection from tree tops. The lack of collection success in Denmark must not be generalized, as better results have been obtained in some other countries.

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Accession: 000325789

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DOI: 10.1111/j.1439-0418.1976.tb04226.x


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