Factors Affecting Lymantria Dispar Mortality in a Willow Wood in Northern Italy. Camerini, G. Bulletin of Insectology, 62(1):21–25, 2009. abstract bibtex Mortality factors affecting a Lymantria dispar (L.) (Lepidoptera Lymantriidae) population in a willow wood next to the Po River (northern Italy) were studied from 1997 to 2007. In that period population density of L. dispar was low, ranging from 5.5 egg masses/100 trees to 18.8 egg masses/100 trees. Willow woods are not the most suitable habitat for gypsy moth populations, which rarely increase to an epidemic level on this host. Mortality is affected by the action of several natural enemies: Anastatus japonicus Ashmead (egg parasitoid), Dermestes lardarius L. (egg predator) and Compsilura concinnata (Meigen) (larval parasitoid). An important control factor is represented by floods, which lay a sediment of mud at the base of the trees, so burying egg masses laid near to the soil. In addition, the flooding water, which is rich of suspended solids, leaves a layer of sludge on the surface of the bark, which can suffocate egg masses. The percentage of egg masses which did not hatch at all (100\,% mortality) because of sludge left on the bark was 17.2\,% in 1999 and 64.7\,% in 2000. Outbreaks of the gypsy moth can rarely occur when the effects of both natural enemies and floods are simultaneously reduced.
@article{cameriniFactorsAffectingLymantria2009,
title = {Factors Affecting {{Lymantria}} Dispar Mortality in a Willow Wood in Northern {{Italy}}},
author = {Camerini, Giuseppe},
year = {2009},
volume = {62},
pages = {21--25},
issn = {1721-8861},
abstract = {Mortality factors affecting a Lymantria dispar (L.) (Lepidoptera Lymantriidae) population in a willow wood next to the Po River (northern Italy) were studied from 1997 to 2007. In that period population density of L. dispar was low, ranging from 5.5 egg masses/100 trees to 18.8 egg masses/100 trees. Willow woods are not the most suitable habitat for gypsy moth populations, which rarely increase to an epidemic level on this host. Mortality is affected by the action of several natural enemies: Anastatus japonicus Ashmead (egg parasitoid), Dermestes lardarius L. (egg predator) and Compsilura concinnata (Meigen) (larval parasitoid). An important control factor is represented by floods, which lay a sediment of mud at the base of the trees, so burying egg masses laid near to the soil. In addition, the flooding water, which is rich of suspended solids, leaves a layer of sludge on the surface of the bark, which can suffocate egg masses. The percentage of egg masses which did not hatch at all (100\,\% mortality) because of sludge left on the bark was 17.2\,\% in 1999 and 64.7\,\% in 2000. Outbreaks of the gypsy moth can rarely occur when the effects of both natural enemies and floods are simultaneously reduced.},
journal = {Bulletin of Insectology},
keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-13778833,compsilura-concinnata,ecology,feedback,floods,italy,lymantria-dispar,non-linearity,populus-alba,populus-spp,riparian-zones,salix-alba},
lccn = {INRMM-MiD:c-13778833},
number = {1}
}
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