Corn: Corn Leaf Aphid (Rhopalosiphum maidis)
Pub 812: Field Crop Protection Guide > Chapter 1: Corn > Corn Leaf Aphid
Field Crop Protection Guide 2011-2012, Order 2011-2012 publication
Table of Contents
These aphids are small (2mm or less), bluish green, soft-bodied insects with black legs and short black cornicles ("tailpipes") near the rear of the abdomen. They have piercing and sucking mouthparts and feed on the juices (nutrients) of young plant tissue (tassel and whorl). They secrete a sticky substance referred to as "honeydew," which can become coated with a blotchy, sooty mould.
Aphids are rarely a problem in corn in Ontario. Spray only if populations exceed 400 aphids per plant on average.
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