48 



further protection against the insects mentioned and to poison the 

 grape root-worm, the beetles of which are at this time just beginning 

 to appear. 



Fourth application. — This should be made within 10 days after the 

 third application, using Bordeaux mixture as above and an arsenical. 

 This and the preceding applications are especially important for the 

 grape root- worm and the grape curculio, and will also afford further 

 protection against the grape berry moth and the leaf -folder. For 

 the insects first mentioned, it is ver^^ important that this application 

 be delayed not longer than 10 days after the third. 



Fig. 3.5.— a grape leaf improperly sprayed. The mixture has br^en sprinkl' d upon the leaf instead 

 of being spraj'ed in a fine mist, and the surface is not evenly and properly covered. 



Fifth application. — This should be made two weeks after the fourth, 

 using the Burgundy mixture recommended, and no arsenical. 



Sixth application. — This should be made about two weeks after the 

 last application, using the Burgundy mixture only. 



QUANTITY OF MIXTURE REQUIRED AND COST OF TREATMENT' 



One hundred and twenty-five gallons of Bordeaux mixture is usually 

 sufficient for a single application to an acre of vines of average size. 

 Where the vines are large and the foliage dense, as much as 150 gal- 

 lons may be necessary for a thorough application. It will be better to 

 use too much of the mixture than too little. The cost for labor and 

 material will vary fi'om $12 to .115 per acre for six applications, 

 including an arsenical poison for biting insects. 



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