Die-back Of Apple Trees
What causes the death of the top shoots in apple trees?
New wood is sometimes diseased by mildew, but die-back is usually due to
two different causes: One, the accumulation of water in the soil during
the excessive rains of mid-winter; second, the occurrence of low
temperatures, including frosts, after the sap has risen. Which of these
causes operate in a certain case depends, of course, upon whether the
soil was heavy and inclined to retain standing water too long, or
whether there were such frosts at about the time when the leaves should
start. Sometimes, of course, both of these conditions worked in the same
place; sometimes one and sometimes the other, but certainly both of them
are capable of causing the trouble. There seems to be no specific
disease; it is rather a matter of unfavorable conditions for growth.
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