Remember also that the reverse is true. When transferring bedding plants or transplants to the field from the greenhouse, carefully inspect them to make sure you do not create a field or garden problem. Warm summers may increase the chances of establishing whiteflies on plants grown outdoors. This may become a source of greenhouse infestation when whiteflies move in as fall begins. Adult whiteflies cannot survive for much more than a week without food plants.
Hobby greenhouses are a good example.
The whiteflies seem to be attracted to the yellow card and become stuck on the board. Biological or Natural Control. A number of natural enemies prey on whiteflies. Among the better known are ladybeetles and spiders. There are also reports of insect-killing fungi being used for control.