(+)-Catechin 7-O-β-glucoside, isorhamnetin 3,7,4′-tri-O-β-glucoside, kaempferol 3,7,4′-tri-O-β-glucoside and quercetin 3,7,4′-tri-O-β-glucoside can be isolated from the hemolymph of N. sertifer. None of these compounds is present in the needles of P. sylvestris, therefore, these flavonoid glucosides are produced by the larvae from flavonoid monoglucosides and (+)-catechin obtained from the pine needles.
The European pine sawfly typically hatches from early April to late May. The larvae feeds off second-year pine needles, skipping new needles and older ones. When they mature, they spin into cocoons. In the fall, they leave their cocoons as a wasp-like creature and mate. September and October is when the female lays eggs in pine trees for the next generation. Their favorite trees are Scots pine, Red pine, Jack pine, and Japanese pines. 
The European pine sawfly is considered a pest as it eats a lot of needles. While this can stunt the growth of the tree, it rarely is enough enough to kill the tree. For controlling it, one can use natural parasites, remove the eggs from the tree, or spray pesticides. Any standard pesticide sprayed on them during their larval stage will kill them. Spraying is usually done very early, often when they're first spotted.
- Flavonoid Metabolites in the Hemolymph of European Pine Sawfly (Neodiprion sertifer) Larvae. Matti Vihakas, Petri Tähtinen, Vladimir Ossipov and Juha-Pekka Salminen, Journal of Chemical Ecology, May 2012, Volume 38, Issue 5, pages 538-546, doi:10.1007/s10886-012-0113-y
- David J. Shetlar. "European Pine Sawfly". http://ohioline.osu.edu/hyg-fact/2000/2555.html. Retrieved 11 January 2013.
- Katherine Mazzey, Michael Masiuk. "European Pine Sawfly Fact Sheet". http://woodypests.cas.psu.edu/FactSheets/InsectFactSheets/html/European_Pine_Sawfly.html. Retrieved 11 January 2013.