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adult whiteflies Album antennae areas average length begin to appear californicum Christmas Cheer Circular 429 commercial nurseries crawler crease degree of infestation Department of Agriculture early as November eggs Elegans Medium elongate evergreen first-instar larva Further survey Gomer Waterer greenish heavily infested host plants hybrid varieties immune imported from England infestation found infestation recorded insect insert their stylets INSTAR LARVAE larvae and pupae larvae pi leaf leaves lightly infested Long Island maximum Medium heavy Medium light mottled Native plants native rhododendrons nicotine sulphate observed occur origin ornamental value oviposition Pink Pearl population preferred host present Puget Sound section pupal reinfestation revealed the presence rhododendron white rhododendron whitefly Roseum Sargent Light season Seattle second instar second-instar larvae SPECIES AND HYBRID species and varieties spray spring stages Tennessee third-instar larvae tion U. S. Department upper surface Vancouver Wash Washington white wings whiteflies were found whitefly larvae wild plants yellow