Noticing tiny, white, fly-like insects on your plants? You may be dealing with a whitefly infestation. Here are tips on how to identify, control, and get rid of whiteflies!
What Are Whiteflies?
Whiteflies are soft-bodied, winged insects closely related to aphids and mealybugs. Despite their name, whiteflies are not a type of fly, though they do have wings and are capable of flying.
Whiteflies can be as small as 1/12 of an inch, are somewhat triangular in shape, and are often found in clusters on the undersides of leaves. They are active during the day and will scatter when disturbed, so they can be easier to spot than some nocturnal insect pests.
There are hundreds of species of whiteflies, but most affect only a small number of host plants. However, there are a few whitefly species that affect a wider range of plants, which make them the most problematic in horticulture. These whitefly species include the greenhouse whitefly, bandedwinged whitefly, giant whitefly, and silverleaf whitefly, among others. Silverleaf whiteflies, which are slightly smaller and more yellow than other whiteflies, are especially common in the southern United States.
Where Are Whiteflies Found?
In USDA Zone 7 and colder, whiteflies are not able to survive winter outdoors, so their presence tends to be limited to indoor plants or greenhouse environments. However, if outdoors plants are bought from an infested greenhouse, whiteflies may become a seasonal outdoor garden pest. (Always inspect plants before bringing them home!)
In warmer regions, whiteflies are capable of overwintering and reproducing outdoors throughout the year, so they can be a problem for both indoor and outdoor plants.
You’ll often start to see whiteflies in mid- to late-summer when it gets warm and humid.
Which Plants Are Susceptible to Whiteflies?
Whiteflies can be found on a wide variety of plants, from ornamental flowers to warm-weather vegetables, including tomatoes, eggplant, peppers, and okra. Some species may attack sweet potatoes, plants from the cabbage family, and citrus trees. Indoors, they will feed on most common houseplants, especially those with soft, smooth leaves.