Greenhouse Update - May 31, 2005
Leanne Pundt, Extension Educator, University of Connecticut
Spittlebugs -- The white foam from spittlebugs can be seen now on Achillea, Boltonia, Coreopsis, Phlox, Potentilla as well as herbs and other perennials as the spittlebugs move in from grassy areas. Spittlebugs are sucking insects about 1/8 of an inch long. You can see white foam along the stems and leaf axils surrounding the small-light green spittlebug nymphs. This foam helps the nymphs stay moist and protects them from predators.
Spittlebugs overwinter as eggs deposited in the shoots. As the weather warms up in the spring, eggs hatch into nymphs that can take up to 7 weeks to mature into tan to dark brown adults. (There is only one generation a year).
Most of the damage is cosmetic only and does not harm the plant. If the infestation is small, either handpick the spittle masses with a gloved hand or use a forceful jet of water to dislodge the nymphs.
Aphids and their natural enemies may still be seen. If you used selective insecticides that are compatible with natural enemies such as Endeavor, Ultra Fine Oil, Synergy Super Fine Spray Oil Emulsion or insecticidal soap, you may see some evidence of natural enemies on your annuals or herbs.
Small parasitic wasps (less than 1/8 of an inch long), lay their eggs inside the aphid. The aphids are killed as the developing larvae first feed upon them and then spin their cocoons. The dead aphids turn into tan "mummies." When the parasitic wasp emerges, you will also see a round exit hole.
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| White foam from spittlebugs L.Pundt photo click for a larger image |
Aphid mummies L.Pundt photo click for a larger image |
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