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WATCH OUT FOR PINE SAWFLY HATCH IN APRIL
At the end of April, START WATCHING PINE TREES FOR clusters of European pine sawfly larvae! These gray-green larvae with the shiny black beady heads are common on mugo, Scots and red pine, and may be found on other pine species as well (white and Austrian pines are usually only attacked if interplanted with the more susceptible species). The phenological indicator plants and their stage of development that coincide with the onset of European pine sawfly egg hatch and presence of small larvae are:
- Serviceberry in bloom
- Redbud beginning bloom
- Purpleleaf sand cherry in bloom
Sawfly control is not difficult, damage can be largely prevented if the larvae are detected early. Mechanical control by pruning twigs or shoots with the clusters of sawfly larvae can be effective on many trees. Vigorous shaking to dislodge the larvae and smashing them with your shoe or raking them up and discarding is another option.
Spot-spray treatment of infested trees can also control sawflies. Sevin, Orthene and horticultural oil (at the "summer rate") are suggested choices. Read and follow ALL label directions.
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