Subject: Help identifying insect
Geographic location of the bug: Ontario Canada
Time: 05:59 PM EDT
Your letter to the bugman: Found this insect on my marijuana plant and wondering if it’s harmful .
How you want your letter signed: Email
This spiny guy is a Treehopper nymph, and based on this Jungle Dragon posting and this BugGuide posting, we believe it is a Buffalo Treehopper in the genus Stictocephala. Treehoppers and Planthoppers have mouths designed to pierce and suck fluids, and they rob the plant upon which they are feeding of valuable fluids. A single individual might not cause much damage, but when they are feeding in groups, significant damage might occur. We would not consider this Buffalo Treehopper nymph to be a beneficial species on your marijuana plant. According to the University of Wisconsin Milwaukee: “In their adult and immature stages, buffalo treehoppers feed on plant sap that they get by puncturing the stems of woody and non-woody plants with their strong “beaks” (and they can do minor damage to both in the process). They may begin their lives on woody plants, where Mom uses her sharp ovipositor to make shallow slits in twigs and to deposit her eggs. When the eggs hatch, the nymphs find their way to more succulent, herbaceous vegetation.”