The Seasons Work On Arsenical Poisoning of Fruit Trees
The Seasons Work On Arsenical Poisoning of Fruit Trees
E D Elmer Darwin Ball
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Exp. Sta. Bull. 131, p. 25, '08. 194 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 3 In a number of the higher valleys of Utah in which there is very little trace of alkali but where oftentimes the ground water is close to the surface, the apple trees of the Ben Davis and Gano varieties suffer from a condition which is commonly known as "collar rot. " These trees often linger along for many years, new areas at the crown dying and then gradually healing over as the tree recovers, only to die in a new or ...larger area at a later date. This trouble seems to be almost exclusively confined to the Ben Davis-Gano type of tree and is occasionally met with throughout most of the apple growing regions. The real cause of this condition is still in doubt. It is usually first noticed just above the surface of the ground as a darkened area of bark which often exudes a few drops of a dark- colored, gummy liquid which later dries, and as the tree grows, this spot becomes a sunken area from which the bark gradually rots away.
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