Abstract
Larval mortality ofNeodiprion sertifer (Geoffroy),Diprion pini (L.) andGilpinia pallida (Klug) were studied in field experiments around a factory complex in southwestern Finland. Larval colonies were transferred on the shoots of Scots pines growing at different distances from the emission source. Larval mortality was highest near the factories. InN. sertifer, larval mortality caused by the nuclear polyhedrosis virus was higher and cocoon mortality caused by parasitoids was lower near the pollutant source. The most abundant parasitoid species wereSynomelix scutulata (Hartig) andLamachus eques (Hartig). 16–67% of theN. sertifer, 0–5% of theD. pini and the 73–100% ofG. pallida cocoons contained parasitoids oviposited during the larval period of the sawflies.
Résumé
La mortalité larvaire deNeodiprion sertifer, deDiprion pini et deGilpinia pallida a été étudiée au cours d'expériences en plein air autour d'un complexe industriel du sud-ouest de la Finlande. Les colonies larvaires furent transférées sur les pousses de pins croissant à différentes distances de la source émettrice. La mortalité larvaire était la plus forte près des usines. ChezN. sertifer, la mortalité larvaire due au virus de la polyhédrose nucléaire était plus élevée et la mortalité à l'intérieur du cocon due aux parasitoïdes était plus faible près de la source polluante. Les espèces les plus abondantes de parasitoïdes furentSynomelix scutulata (Hartig) etLamachus eques (Hartig). De 16 à 67% des cocons deN. sertifer, de 0 à 5% de ceux deD. pini et de 73 à 100% de ceux deG. pallida contenaient des parasitoïdes issus de pontes effectuées au cours de la période larvaire des tenthrèdes.
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Heliövaara, K., Väisänen, R. & Varama, M. Larval mortality of pine sawflies [Hymenoptera: Diprionidae] in relation to pollution level: A field experiment. Entomophaga 36, 315–321 (1991). https://doi.org/10.1007/BF02374567
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DOI: https://doi.org/10.1007/BF02374567