Sawfly larvae can at once be recognized by the curious positions they assume, and by the number of pro-legs, which exceeds ten.
Currant and gooseberry are also attacked by sawfly larvae (Nematus ribesii and N.
For all exposed sawfly larvae hellebore washes are most fatal, but they must not be used over ripe or ripening fruit, as the hellebore is poisonous.
- A, Front of head of Sawfly (Pachynematus); a, labrum; b, clypeus; c, vertex; d, d, antennal cavities.
P. sylvestris in Britain is liable to many insect depredations: the pine-chafer, Hylurgus piniperda, is destructive in some places, the larva of this beetle feeding on the young succulent shoots, especially in young plantations; Hylobius abietis, the fir-weevil, eats away the bark, and numerous lepidopterous larvae devour the leaves; the pine-sawfly is also injurious in some seasons; the removal of all dead branches from the trees and from the ground beneath them is recommended, as most of these insects lay their eggs among the decaying bark and dead leaves.