Redheaded Pine Sawfly
We have received several reports of redheaded pine sawfly activity this week. The larvae feed gregariously. This group feeding of larvae can defoliate whole sections of a pine very rapidly in late August to early September.
Physical control: Prune off the tip growth while the larvae are small.
Chemical control: Horticultural oil sprayed onto the larvae will give control. Neem products can also be used to control early instar larvae. Spinosad (Conserve) will also give control.
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Information from the September 4, 2009 edition of the TPM/IPM Weekly Report for Arborists, Landscape Managers & Nursery Managers from the University of Maryland Cooperative Extension http://www.ipmnet.umd.edu/09Sep04L.pdf
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