A knifepoint reveals the density of obscure scale on a pecan tree.

Obscure Scale: A Stealthy Pest of Pecan

A handful of pest species cause most economic injury to pecan year after year. Pests attacking the developing nut include the stink bug complex, pecan weevil, hickory shuckworm, and pecan nut casebearer, while the aphid complex and mites attack the foliage. Occasionally, other pest species may cause sporadic injury, but their activity is usually limited...

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A adult black pecan aphid and her nymphs sit on the yellow, chlorotic spot that they created on this once green pecan leaf.

Pecan Aphids, Part II: Feeding Biology

In the first of this three-part series on the pecan-feeding aphids (March 2019), I covered how different aphid species distribute on pecan foliage. At the end of that article, we questioned why nymphs of the blackmargined pecan aphid and yellow pecan aphid favor the underside of the pecan leaf, but a proportion of black pecan...

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