a RAPE INSECTS 459 



stocks experience has shown that many factors have to be con- 

 sidered if commercial success is to l^e attained. There are many 

 varieties of both Vitis riparia and rupestris, many of which are 

 worthless for stocks. A satisfactory stock must be adapted 

 to the soil and climate of the region and be of sufficient size 

 and vigor to give a strong, healthy growth to the vine and thus 

 render it able to set and mature a heavy crop of high quahty. 

 The selection of resistant stocks is, therefore, a more or less 

 local or regional problem, requiring close observation and care- 

 ful experimentation by experienced growers who are thoroughly 

 famiUar with local conditions and with all the compUcated 

 problems of the grape industry. 



References 



Riley, 6th Rept. Ins. Mo., pp. 30-87. 1874. 

 Mayet, Les Insectes de la Vigne, pp. 47-147. 1890. 



A good resume of the extensive European work on the phylloxera. 

 Cal. Agr. Exp. Sta. Appendix to Viticultural Rept., 1896. 1897. 



Resistant Vines. 

 Cal. Agr. Exp. Sta. Bull. 131. 1901. 

 Cal. Agr. Exp. Sta. Bull. 192, pp. 99-111. 1907. 

 Cal. Agr. Exp. Sta. Bull. 197, pp. 118-147. 1908. 



Other Grape Insects 



Climbing cutworms : apple, p. 138. 

 Twig-pruner : apple, p. 200. 

 Flea-beetles : apple, p. 203. 

 Ring-legged tree-bug : apple, p. 208. 

 Green June-beetle : peach, p. 296. 



