A microscope image shows the surface of a Kapur Paya fossil leaf. Tiny pores called stomata and the outer skin cells of the leaf are visible, which helps scientists compare it to living trees.

Sean O'Brien, from the UNH Cooperative Extension, takes a look at how beech leaf disease spreads and the signs to help you ...

A scanning electron microscope reveals nematodes (highlighted in green) inside the spongy mesophyll of a European beech (Fagus sylvatica) leaf infected with beech leaf disease (BLD). Eggs are ...