Subject: Weed brownies g
Location: Ottawa ontario
August 27, 2016 10:57 am
I am not sure what these are but they are all over the weeds in my back yard. Is it something dangerous?
Signature: Sarah Knox
These are Aphids, but we are not certain of the species. According to BugGuide: “Aphids suck juices from plants and may be quite damaging. Some are restricted to a single plant species or group of related plants. Others may alternate between two entirely unrelated host plants as a necessary part of their life cycle” and “Aphids may be identified by two tubelike projections on the posterior, called cornicles or siphunculi. These appear to function as a means of chemical defense, emitting pheromones to alert other aphids about a predator nearby. They also offer mechanical protection, as the fluid emitted can gum up the mouthparts of the predators. Species may sometimes be identified by the host plant, but several aphid spp. may infest the same host.”