Chances are that if you have a greenhouse with a variety of plants a majority of, if not all of them, would make a satisfactory meal to the greenhouse thrips. This thrips will chow down on a vast variety of plants, from crop plants to trees, to gardening plants to weeds specifically eating the leaves and foliage of the host plant. However it tends to pick out plants that are water stressed that have harder leaves and are non-herbaceous (University of California, 2009). Some specific victims of greenhouse thrips attacks include azalea, begonia, croton, cyclamen, ferns, fuschia, grape vines, orchids, palm, and rose plants (North Carolina State University). Interestingly enough the greenhouse thrips, in relevance to its name, likes to reside to eating plants that flourish in a greenhouse environment or hot tropical areas. It also prefers to eat in the shade under the leaves of the plant (University of California 2009). Here you can find a short list of some of the specific plant species that are targeted by the greenhouse thrips. In order to feed on the plant they use specialized mouth parts to scrap off the epidermal layer of the host plant, getting to inner cell contents that provide them with the proper nutrition (Bain et al., 2009). This however can be very detrimental to the plant itself as in most cases the host plants leaves tend to turn a silvery bleached color where feeding has occurred and if damage is bad enough the leaf will turn a brownish color, dry out and fall off, along with any fruit close to the infected area (North Carolina State University).  Hard dark spots will also freckle the surface of the leaves due to excrement dropped by the greenhouse thrips (Bain et al., 2009). You may want to visit here for more information on the damage caused by Heliothrips haemorrhoidalis (Bouche).