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BULLETIN 903, U. S. DEPARTMENT OF AGRICULTURE. 



no traces exist of large vineyards pulled up but not replanted, 

 and thus accurate data are unobtainable. Therefore a summarized 

 statement based upon data to be found in the various reports of 



Fig. 1. — Map indicating progress of phylloxera infestation in California. The map does 

 not show the severity or degree of infestation. Counties having less than 250 acres of 

 vineyards were not inspected. In those counties marked doubtfully infested inspection 

 took place at a time of year when the insect was difficult to detect ; none were found 

 but the aerial growth of the vines suggested phylloxeration. In the counties of Kings, 

 San Benito, Merced, Stanislaus, Calaveras, Amador, and Tehama no phylloxera was 

 found at the time of inspection, but they should not be deemed to a certainty free of the 

 insect. 



the State Board of Viticultural Commissioners and other agricul- 

 tural and horticultural reports is presented. This, with the aid of 

 a map of California (fig. 1) to indicate infested counties in shad- 



