New Host Plant Record for The Poison Ivy Sawfly, Arge humeralis (Hymenoptera: Argidae), and Its Performance on Two Host Plant Species
Abstract
The poison ivy sawfly, Arge humeralis Beauvois, was previously known to feed only on poison ivy, Toxicodendron radicans (L.) Kuntze. However, in 2009, larvae were discovered in southern Florida feeding on poisonwood, Metopium toxiferum (L.) Krug and Urban. To better characterize the host range of A. humeralis, we compared larval performance on T. radicans and M. toxiferum. Adults oviposited on both plant species, and days to pupation and survival to adulthood were similar. With the exception of longer 1st and 4th stadia on T. radicans, stadia were also similar. Most mortality occurred during pupation. The use of M. toxiferum by A. humeralis indicates a wider range of hosts and of ecosystems than previously known for this insect.La unica hospedera previamente conocida de la avispa de sierra de la hiedra venenosa, Arge humeralis Beauvois, era la hiedra venenosa, Toxicodendron radicans (L.) Kuntze. Sin embargo, en 2009, las larvas fueron encontradas en el sur de Florida alimentándose en poisonwood, Toxiferum metopium (L.) Krug y Urban. Para caracterizar mejor el rango de los hospederos de A. humeralis, comparamos el rendimiento larval en T. radicans y M. toxiferum. Los adultos ovipositaron en las dos especies, y el tiempo para llegar a la etapa de pupa y la sobrevivencia a la etapa adulta fueron similares. La mayoría de la mortalidad ocurrió durante la pupación. Con la excepción de los estadios primero y cuarto mas largo en T. radicans, los estadios tambien fueran similares. El uso de M. toxiferum por A. humeralis representa un rango más amplio de hospederos y de ecosistemas que los reportados previamente para este insecto.
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