Whiteflies
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Whiteflies not only damage plants by sucking the sap from the foliage, but they also may bring disease into the greenhouse. Whiteflies secrete a sticky substance called "honeydew" onto the plant. The honeydew, which itself is not harmful, facilitates a sooty mold that can stunt the growth of the plant. Introduction of a parasitic wasp can help combat a whitefly invasion.
Aphids
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Aphids are small, soft-bodied, sap-feeding insects that favor tender, young growth. They are often called greenflies or blackflies. Most aphids tend to colonize and can be found in clusters on the foliage and stems of plants. Like whiteflies, aphids produce "honeydew," leading to the development of sooty mold.
Thrips
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Thrips attack a wide range of plants. They are small, elongated, cylindrical insects, that range in color from light brown to black. They feed in large numbers on leaves, flowers and buds, causing a silvery mottling and some distortion. Predatory mites may be introduced to the greenhouse to control thrips.
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