Difference in the abundance of scale insect parasitoids among four cardinal directions
Keywords:
Coccidae, Hymenoptera, tree quadrant, sampling, oak lecanium, European fruit lecaniumAbstract
Summary
We conducted a study to assess the potential differences in the abundances of hymenopteran parasitoids among cardinal directions. Experiments were conducted on scale insect–infested willow oak trees in the urban landscapes of South Carolina and Virginia. The parasitoids captured on yellow sticky cards deployed at the cardinal directions of the trees were identified and counted. We found that there were no significant differences in scale insect and parasitoid abundances among cardinal directions, and parasitoid abundances were weakly correlated with scale insect densities. The results suggest that 1 yellow sticky card could be deployed per tree, regardless of tree quadrant, to sufficiently sample for parasitoid abundance.
Sumario
Se realizó un estudio para evaluar posibles diferencias en la abundancia de parasitoides himenópteros entre los diferentes puntos cardinales. Los experimentos se desarrollaron en árboles de robles sauces infestados con cochinillas en localidades urbanas de Carolina del Sur y Virginia. Los parasitoides capturados en las tarjetas pegajosas amarillas colocadas en los puntos cardinales de los árboles fueron identificados y contados. No hallamos diferencias significativas en las abundancias de parasitoides entre puntos cardinales. Los resultados sugieren que el uso de una sola tarjeta pegajosa amarilla por árbol, independientemente del cuadrante en donde se coloque, sería suficiente para muestrear la abundancia de parasitoides himenópteros.
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