I found one of the hibiscus plants infested with white flies. I cut the hibiscus and bagged the leaves. I have been checking my peppers and so far they look ok, so for now I think I am ahead of them. I have corn tasseling now and that will help because corn has always attracted the purple lady bugs that eat a lot of white flies.
I found a few whiteflies on eggplant in the green house, so I hosed them off. It will be much harder to contain them there.
White flies are a problem every two years. It has to do with the predator prey cycle. The purple ladybugs are the main controllers of the whiteflies and when their populations are down the white flies goes up.
I haven't had much luck controlling white flies chemically in the past, and its really been working out for me not to use anything. So, my approach this year will be to monitor, encourage the ladybugs to move in, keep the plants as healthy as I can, cut my losses and cut any plants that are really infested.
Unfortunately, if I resort to spraying, I will have what I have in the front yard, pests I always have to keep spraying to control. My front yard has ornamentals, gardenia and roses. It is very hard to control pests on gardenia and roses without resorting to chemicals.
That being said, since I am having so much better results not using pesticides, I am trying to bring back the beneficials to the front yard by planting companion plants. I have nectar plants but the beneficial insects avoid them because they have been treated with systemics. I have switched from the one year imodiclopid to the six week systemic rose control, which I only resorted to when I had no choice. I have not used that in about a month. I am hoping to go pesticide free shortly but it may mean that I will have to replace some plants that are very heavily infested but also some very old roses. I also have a nice hibiscus but I will either have to tolerate the erineum gall mites disfiguring all of the leaves and hoping the plant survives that until the gall mites are done for the summer, or I will need to remove the plant.
Happy gardening in Hawaii. Gardens are where people grow.