Publisher's Synopsis
Excerpt from Bulletins of Alabama Agricultural Experiment Station, Auburn, Vol. 17: Index; Bulletins 144-148 and 22nd Annual Report and Circular No. 3; January to December, 1909; List of Available Bulletins, June, 1910
Close Observation with the naked eye shows that the scales are marked With rings of light and dark gray around a nearly black center. When very abundant they give a general ashy-gray appearance to the entire bark which is noticeable at some distance from the tree.
Nature OF the injury. - On living infested branch es, especially on growth two or more years Old, the sur face becomes irregularly pitted Or has depressions in spots where the scales are most abundant. The injury is of two kinds. Much sap is abstracted by the myriads of sucking insects, but more important than this is the ef feet which these scales have of causing a thickening of the cell walls which are penetrated by their slender mouth parts. This thickening checks the ?ow of sap in the branches, and this means the ultimate starvation of the parts of the branch beyond. The San Jose produces a distinctive red stain around the point Of attack, either upon infested fruit or just under the scale in the bark. This appears upon lightly scraping Off the outer bark.
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