How can I know if there are mites on a plant? - briefly
Inspect leaves for tiny moving specks, stippling, or webbing, and use a magnifying glass or hand lens to confirm the presence of mites. If uncertain, a sticky trap or leaf wash examined under a microscope will reveal any hidden infestations.
How can I know if there are mites on a plant? - in detail
Detecting the presence of mites on a plant requires careful visual inspection and, when necessary, the use of magnification tools. The following points outline reliable indicators and methods.
Visible symptoms on foliage often include stippling—tiny, discolored spots where mites have fed—along with a fine, web-like coating on the undersides of leaves. Leaves may become curled, distorted, or exhibit a bronzed appearance as damage progresses. In severe cases, entire leaf surfaces may turn yellow or brown, and new growth can be stunted.
To confirm an infestation, examine the plant with a hand lens or a binocular microscope at 10–30× magnification. Look for the mites themselves: tiny, elongated bodies ranging from 0.2 to 0.5 mm, typically red, brown, or translucent. Common species such as spider mites, broad mites, and russet mites can be distinguished by shape and leg arrangement. Check the undersides of leaves, where most species congregate, and also inspect stems and flower buds.
If direct observation is difficult, employ the “leaf‑tap” technique. Hold a leaf over a white sheet of paper, gently tap or shake it, and watch for falling mites or their webbing. A sticky trap placed near the plant can also capture wandering individuals, providing evidence of activity.
Chemical or biological testing is rarely required, but a simple leaf‑wash can help. Submerge a few leaves in a container of water with a few drops of mild detergent, agitate, then examine the water under a microscope. Mites will detach and become visible in the solution.
Regular monitoring, especially during warm, dry periods when mite populations tend to surge, is essential for early detection and effective control.