2017-08-19

Pine False Webworm

Photo Credit: Natural Resources Canada

Pine False Webworm (Acantholyda erythrocephala) is a pamphiliid sawfly of European origin that is now present in several parts of Eastern North America and they feed heaviest on Eastern white pine and red pine, but also attacks mugo, Scotch, Austrian, Japanese red, and table mountain pine.  The larvae have yellowish coloured heads with small brown spots and greenish-gray bodies, feeding primarily on old foliage. When the old foliage has been consumed, they will feed on the current year's needles, ultimately causing sever defoliation.

Adult sawflies emerge from overwintering pupae in the soil in May, and lay eggs. The female’s saw-like ovipositor cuts slits in the needles, inserting the end of the eggs into the slits. The eggs hatch into brown larvae that feed for 18 to 20 days before dropping to the soil to pupate. Webbing is typically spun around needles below the branch tip, leaving the end of the shoot free of webbing and damage. There is one generation per year.

Information was provided by Natural Reseources Canada.

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