GRAPE PESTS AND THEIR CONTROL 229 



deaux mixture and arsenate of lead, contact insecticides, as 

 some of the nicotine preparations, may have to be added ; or, 

 for special purposes as specified in discussing the several pests, 

 cheap molasses is added. It is doubtful, however, whether 

 the grape can be grown with commercial success where insects 

 and fungi prevail and are so pestiferous as to require annually 

 more than two or three applications of spraying mixtures. 



