The blight appears in many cases soon after the trees are 

 leaved out, but more often later, and may appear at any time 

 during the summer. Its growth ceases in the Fall at about 

 the time the leaves begin to dry and turn preparatory to 

 shedding, or at the approach of cool weather. The blight 

 makes itself manifest by causing the affected parts, both 

 leaves and stems, and it may be also the fruit to turn a 

 brown color, which varies from a light brown to a dark to- 

 bacco brown, or in some cases an almost black appearance. 

 This coloration of the leaves due to the blight id readily 

 distinguished from the coloration of the leaves due to any 

 other cause, as the partial or total breaking of a stem, or 

 the girdling of the trunk or stems, or an injury of the roots. 

 In the case of coloration by blight the leaves do not appear 

 dried or shriveled as a rule, except in the case of the water 

 oak, but preserve their proper shape; whereas in the colora- 

 tion due to other causes the leaves appear dried and shriv- 

 eled and have a lighter brown color. Moreover, the colora- 

 tion due to blight may not at the time being affect the en- 

 tire leaf, but may appear on any portion of the leaf or in 

 several places, and cause it to be spotted. * Ultimately, how- 

 ever, the entire leaf will become affected unless the growth 

 of the disease be checked by some cause. The disease ap- 

 pears first as a rule at the buds or growing tips of stems or 

 young leaves where the tissues are tender; and from these 

 places it spreads down the stem, involving ultimately all the 

 branches and leaves of the affected limb together with its 

 fruit. As a rule a tree is attacked in several places at once • 

 it may be on many different limbs or on several twigs of the 

 same limb or both; and when a tree is attacked in a great 

 many localities involving a large number of limbs, and this 

 early in the season, the disease will often so increase as to 

 involve the entire tree above the roots and kill it in one sum- 

 mer, if unattended to. -It is not an uncommon occurrence 

 when such a tree has been cut down close to the ground soon 



