Gardeners know the phenomenon: on the trunks and branches of trees appear a drop of thick, dark, sticky liquid. This process, which may affect and leaves of trees, and even the fruits, is called "GUMMOSIS". Mostly, this happens with stone fruit trees. In central Russia, it is cherry and plum, in the southern regions, GUMMOSIS common also in apricots, peaches, mulberries. In pome fruits - apples and pears - it is many times less.
GUMMOSIS can start for many reasons: because of the frost-crack in severe winters, due to damage trees, pruning inept, defeats their various pest - beetles bark beetles, caterpillars, and microorganisms defeats. In the place where the wood is struck, the formation of gums begins. Over time, the affected area may increase in size by grabbing the adjacent areas of healthy wood. When the individual and small foci of disease kamedeobrazovaniya relatively dangerous. If the destruction of the wood affected a large area turned out to be even more so if the affected cambium layer, where cells divide, the further growth of the tree in this place becomes impossible. GUMMOSIS can begin because the tree for some reason, does not use the accumulated reserve of moisture and nutrients. For example, if as a result of the strong spring frosts killed the flower buds, fruit formation becomes impossible, and recycle material stocked tree is not able to. But from them we need to somehow get rid of, and it is in the form of gum formation. GUMMOSIS may start due to excessive irrigation or standing water in heavy clay soil. The roots of the tree then absorb too much moisture, and stocked with useful substances dissolved in it, thereby initiating the process of formation of gum. Scientists, botanists and experienced growers say that very often provoked GUMMOSIS clumsy pruning stone fruit crops. In their view, crop, even undeniably thickened cherries and plums should be very careful, much less than, for example, apple. And other growers believe that it is better not cut cherries and plums. To prevent the onset of GUMMOSIS process, you need time to heal frost-crack in the trees, right to water them and take measures to soil drainage, if it is heavy and clay. A good preventive measure is also considered spraying the trees with liquid Bordeaux - a mixture of solutions of copper sulfate and hydrated lime. If the damage has affected a large portion, it is best to make a pruning to healthy wood.