How to Identify Bugs That Attack Orchids

Examine the bugs that you see on your orchids. For example, insects that look like bumps may be scales, which are usually found on the underside of the leaves. Small, pear-shaped bugs are most likely aphids. Tap a leaf over a white piece a paper. This may free some of the insects from the leaves to make looking at them easier. Also, a magnifying glass is helpful for careful observations.

Examine the leaves for any damage or residue left behind by the bugs. For example, mealybugs leave behind a secretion that looks like white fuzz. Mites usually leave behind fine webbing like a spider's web and a silvery substance that turns the foliage brown. They also suck the chlorophyll out of orchid leaves, leaving little pin holes that often look yellow. Aphids leave behind a sugary liquid on which a black mold may grow.

Examine the foliage for signs of insects and damage. Gently blow on the flower buds to open them slightly to see any insects on the inside. Thrips, for example, feed on the flower buds, which may fail to open or produce deformed flowers. The petals can become streaked and have a silvery appearance.

Compare your observations about the bugs and the effects they have on your orchids to a garden book or website about orchids to identify correctly the bugs that are attacking your orchids.