New paper by Haase et al. published in December issue of Oikos is based on data from three forest diversity experiments, including Satakunta. The study found contrasting effects of tree species diversity on tree growth and insect herbivory. Trees in mixtures tended to grow taller, but on average received more insect herbivory relative to monocultures. No tree species significantly benefited both in terms of increased growth and reduced herbivory when grown in mixtures. To improve both tree growth and resistance to herbivores in tree species mixtures seems therefore challenging. You can find the paper here: http://onlinelibrary.wiley.com/doi/10.1111/oik.02090/abstract