Black Thrips On Plants. Female thrips lay their eggs. The adult insects are narrow bodied and up to 2mm in length.
Thrip feed by puncturing the upper layer of a cell and sucking out the insides. To identify this nuisance in your garden, check the leaves, buds, flowers, and fruits of your plants for white splotches and black feces. Light blue cards coated with a thin film of oil suspended within two feet above indoor plants can be used as indicator traps.
So the best place to start is to inspect your own indoor plants for thrips.
Thrips (order thysanoptera) are minute (mostly 1 mm long or less), slender insects with fringed wings and unique asymmetrical mouthparts. Now that you know that those bugs are called thrips. Entomologists have described approximately 6,000 species. Get rid of them naturally without resorting to toxic sprays by using these safe , organic methods.