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Forestry 1980 53(1):71-80; doi:10.1093/forestry/53.1.71
© 1980 by Institute of Chartered Foresters
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The Web-spinning Larch Sawfly, Cephalcia lariciphila Wachtl. (Hymenoptera: Pamphiliidae) A New Pest of Larix in England and Wales

D. J. BILLANY and R. M. BROWN

Forest Research Station, Forestry Commission Alice Holt Lodge, Farnham, Surrey

The first reported outbreak of Cephalcia lariciphila in Britain occurred at Margam forest, west and mid-Glamorgan, in 1972 on Larix kaempferi. Twenty-two forests subsequently became affected in England and Wales between 1972 and 1978.

Reduced host vigour was noticed in 1977 in areas defoliated for five successive years and deaths in 1978 necessitated sanitation felling.

A decline of damage at Margam and Rheola forests is ascribed to the parasite Olesicampe monticola but widespread collapse of the infestation has not so far occurred.

Immediate aims are the biological control of the sawfly by naturally occurring parasites and pathogens. Longer term investigations into control involve the location, isolation and synthesis of pheromones.


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