Effect of different hosts onThaumetopoea pityocampa populations in northeast Portugal |
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Authors: | P S Arnaldo L M Torres |
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Institution: | 1. Departamento de Protec??o de Plantas, Universidade de Trás-os-Montes e Alto Douro, 5001-801, Vila Real, Portugal
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Abstract: | A study was carried out at the Natural Park of Montesinho, NE Portugal, in order to evaluate the effect of different pine
species (Pinus pinaster Ait.,P. nigra Arn. andP. sylvestris L.) onThaumetopoea pityocampa populations. The structure of the egg batches, the impact of the egg parasitoids on natural mortality of the pest and the
species of parasitoids present, as well as their emergence dynamics, were analyzed. The length of the egg batches varied among
pine species with the longest ones onP. nigra. The mean number of eggs per batch differed betweenP. sylvestris and the two other hosts studied, with fewer eggs per batch on the first. No differences were found in the size of eggs among
pine species. The egg mortality varied between 25.8% and 33.0%, with no differences among hosts. Parasitism was the main cause
of death.Baryscapus servadeii (Mercet.) was the most abundant parasitoid species, followed byOoencyrtus pityocampae (Dom.) andTrichogramma embryophagum Htg.B. servadeii dominated in the egg batches collected fromP. pinaster andP. nigra, whereasO. pityocampae was most frequent onP. sylvestris. The emergence ofB. servadeii started in the middle of March and continued until August, with the emergence peak at the end of May. The emergence ofO. pityocampae started at the end of April and continued throughout September, with maximum values in June.
http://www.phytoparasitica.org posting Sept. 20, 2006. |
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Keywords: | Pine processionary moth Thaumetopoea pityocampa egg batches structure natural mortality egg parasitoids Baryscapus servadeii Ooencyrtus pityocampae Trichogramma embryophagum pine species Pinus pinaster P nigra P sylvestris |
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