A text-book of mycology and plant pathology . Fig. 114.—Happy white elm, Ulmus americana, plentifully supplied with groundwater near the surface in a depression of the glacial outwash plain at Westbury,L. L, July, 1915. The fall of hail stones may, if they are large enough, cause thedecortication of twigs, or the abrasion of other plant parts, thus per-mitting the entrance of destructive bacteria and fungi to the interiorof the plants. Wind is an active agent in the breaking off of buds and limbs andthe formation of dangerous wounds. In such situations, as high moun-;tains, sand dunes and rock
A text-book of mycology and plant pathology . Fig. 114.—Happy white elm, Ulmus americana, plentifully supplied with groundwater near the surface in a depression of the glacial outwash plain at Westbury,L. L, July, 1915. The fall of hail stones may, if they are large enough, cause thedecortication of twigs, or the abrasion of other plant parts, thus per-mitting the entrance of destructive bacteria and fungi to the interiorof the plants. Wind is an active agent in the breaking off of buds and limbs andthe formation of dangerous wounds. In such situations, as high moun-;tains, sand dunes and rocky shores, where trees are exposed to theforcible action of the wind, they assume a windswept, bisected, orprostrate form, which is characteristic and picturesque (Fig. 16). GENERAL CONSIDERATION OF PLANT DISEASES 287. Fig. 115.—Unhappy vase-shaped white elm, Ulmus americana, 100 yards southof a happy larger elm both growing on the outwashed plain, Westbury, L. I., July,1915-
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Keywords: ., bookcentury1900, bookdecade1910, bookidtextbook, booksubjectfungi
