We have recently Purchased a TerraTech S300 tree sheer with holding grapple to assist us with our forestry, site clearance, woodland management and especially our ash dieback contracts. This sheer is capable of cutting up to 12.5" diameter timber and with the capability to also hold the timber at the same time it means there is no chance of the timber falling out of the sheer once it has been cut. With the ash trees becoming even more brittle and dangerous, having the tree sheer for mechanical removal or dismantle is going to mean that our saw operatives are much less likely to be in a position of falling dead branches.
Ash dieback is a highly destructive disease of ash trees (Fraxinus species), especially the United Kingdom's native ash species, common ash (Fraxinus excelsior). It is caused by a fungus named Hymenoscyphus fraxineus (H. fraxineus), which is of eastern Asian origin.
Identification and symptoms
Among the first symptoms that an ash tree might be infected with H. fraxineus is blackening and wilting of leaves and shoots (top picture) in mid- to late summer (July to September). These months are the best time of year to survey ash trees for chalara symptoms in the foliage. This is because once autumn begins in late September or October, the normal seasonal change in the colour of the leaves can be mistaken for symptoms of the disease.Most infected leaves are shed prematurely by the tree, but in some cases the infection progresses from the leaves and into the twigs, branches and eventually the trunk, causing dark lesions, or cankers, to form in the bark. These often have a characteristic elongated-diamond shape (pictured above) centred on the joints between branches, or where branches join the trunk. The lesions typically, but not always, spread upwards and downwards from the joint as the infection spreads in both directions. They can eventually girdle the whole trunk, cutting off the tree's supply of fluid and nutrients from the roots.
Several images of how chalara (ash dieback) effects the heartwood of an ash tree causing it to die from the inside out. These images were taken from a recent contract using our grapple saw mounted to our 8 ton excavator which we used to remove the majority of infected ash trees from a 5 acre 30 year old planted woodland.