EXPERIMENT STATION BULLETINS. 323 



J^ecoiid time. Jusf liefore blooiniiio-, P.oi-deaiix as before witli the 

 addition of an aisenieal poison* for grape berry moth. 



Third time. Just as the bloi-sonis fall with I^ordeaux and poison as 

 before. 



Fourth time. About ten days or two weeks after the ]»revious apjdica- 

 tion with Bordeaux and tlie poison. 



This fourth application and further ones depend upon weather condi- 

 tions and the amount of rot prevalent in the vineyard. If another spray- 

 ing is deemed necessary, use Bordeaux only : and if more are given, use 

 the neutral copjjer acetate 1 lb. to 50 gal. of water to prevent staining 

 the fruit. 



Do all the spraying very thoroughly. Fixed nozzles can be used in all 

 but the last two or three a]>])licati(ins when trailers with nozzles directed 

 by hand should be used. 



Old rotten grapes or" prunings left in the vineyard or about the pack 

 ing shed are a source of infection. It pays to gather and burn or bury 

 these "mummies" 'and prunings. 



*The cheapest poison is made with 4 lbs. washing soda, 1 lb. white arsenic, 1 fral. water. Mix the 

 washing soda and the arsenic, add the water and l)oil nntil dissolved. Keep in jugs or .jars and mark 

 "Poison" very plainl.v. Use 1 pint of this solution to "lO gallons of Bordeaux. If arsenate of lead is 

 preferred, use 2 lbs. to 50 gals, of Bordeaux. 



