1,721,550 research outputs found
Effects of Entomopathogenic Nematodes On the Spruce Web-spinning Sawfly Cephalcia-arvensis Panzer and Its Parasitoids In the Field
No full textField tests were conducted in the Asiago Forest, Venetian Prealps (Italy) to evaluate the efficacy of nematode strains (Heterorhabditis sp. HL 81, Steinernema carpocapsae IS 230, S. feltiae ( = bibionis) IS 389, S. kraussei SK) against the spruce web-spinning sawfly Cephalcia arvensis. Soil applications of 100 juveniles cm-2 of S. feltiae and S. kraussei resulted in 56% and 36.4% reduction of emergences of sawfly, respectively, when performed before the mature larvae drop and enter the soil. The effectiveness of S. feltiae becomes 32.3% if the nematodes are applied when the larvae have already prepared their chambers. S. feltiae parasitized more females and long-term diapausing individuals than S. kraussei. The two most effective strains (IS 389 and SK) seem to be well adapted to low temperature, which is likely to be the most important limiting factor for nematode activity in the mountain spruce forests. An ichneumonid parasitoid (Xenoschesis fulvipes) was strongly affected by S. feltiae, resulting in 66.6% reduction of emergences. Another ichneumonid, Ctenopelma lucifer, seems to be less affected than X. fulvipes by the nematode application
Host-plant relationships and population dynamics of the Pine Processionary Caterpillar Thaumetopoea pityocampa (Denis & SchiffermÃ1⁄4ller).
No full textProcessionary moths and associated urtication risk: global-change driven effects
No full textProcessionary moths carry urticating setae, which cause health problems in humans and other warm-blooded animals. The pine processionary moth Thaumetopoea pityocampa has responded to global change (climate warming and increased global trade) by extending its distribution range. The subfamily Thaumetopoeinae consists of approximately 100 species. An important question is whether other processionary moth species will similarly respond to these specific dimensions of global change and thus introduce health hazards into new areas. We describe, for the first time, how setae are distributed on different life stages (adult, larva) of major groups within the subfamily. Using the available data, we conclude that there is little evidence that processionary moths as a group will behave like T. pityocampa and expand their distributional range. The health problems caused by setae strongly relate to population density, which may, or may not, be connected to global change
Field studies on the behaviour of two egg parasitoids of the Pine Processionary Moth Thaumetopoea pityocampa.
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Assessment of host plant susceptibility to larvae of large moth species by a new bioassay technique
No full textPhytophagous insects in the energy flow of an artificial stand of Pinus nigra Arnold in Northern Italy
No full textOsservazioni sull'attivita' predatoria dell'Upupa Upupa epops a carico della Processionaria del Pino Thaumetopoea pityocampa
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