Well for one thing, whiteflies are not to be trifled with. They are serious pests that pose serious dangers to your plants. Youve been warned. So have you ever seen a whitefly before? Yes. Did you know it was a whitefly at the time? No, probably not. The most obvious time to see these little critters is when you brush against a plant, triggering a mass exodus of a cloud of white bugs. Those bugs, yes you guessed it, are whiteflies. Congratulations, you have now met your nemesis and have seen whiteflies on plants.
As mentioned before on this site, whiteflies and aphids are closely related. For all intensive purposes, they do essentially the same things. All in all, there about 1,000 different variants of this organism, yet every single one wants to absolutely wreck your plants. Basically, they feed on the lifeblood of the plants, phloem sap. They do this by drilling into the veins and then parasitically drawing out the juices. As if that wasnt bad enough, they also release a substance referred to as honeydew. Now dont let the sweet name of this excretion fool you.
It is not desirable in any sense of the world. The honeydew attracts a host of other insects to the infested plants. At this point, you may be asking yourself why would the whiteflies want more competition? Well first off they dont. Instead, the insects that they draw to the plants usually feast on the natural predators of the whiteflies. Thus with the predators exterminated, the whiteflies on plants are free to reproduce and eat, reproduce and eat, and then eat and reproduce. Pretty soon, you have a full blown infestation: lucky you. To add insult to injury, the expiring honeydew will result in a festering mold that further burdens the plants and diminishes the plants photosynthetic capabilities.