Thank you, cycadjungle, for the great tip about coffee ground tea. I have one question: how is that different from simply watered down leftover coffee? Is there a recipe or a ratio to use? I, too, fight white flies in my little greenhouse and don't like to use chemicals. I've always added coffee grounds when planting to combat our alkaline soil (and I recycle used filters in the bottom of pots to prevent soil loss). But I've never heard of spraying pests with it. I definitely want to try it!
And thanks to all of you for the info on Bayer. Sometimes reading the label doesn't tell the whole story.
I only have one species with an aphid infestation, climbing milkweed vine (cynanchum racemosum var. unifarium, Talayote). I let the aphids thrive on it because they draw ladybugs. The aphids haven't killed the vines; but if they jump to any other plants, I'll use coffee tea.
