222 DISEASES OF THE SWEET PEA 



3. To each lOO gallons of 1 and 2, add 

 1 lb. of arsenate of lead to keep in check 

 the biting insects. If Paris green is used 

 instead of arsenate of lead, add one pound 

 of extra lime to every pound of the above 

 insecticide used. These formulae apply to 

 sweet peas grown on large scales. On 

 smaller plots, such as the home garden, the 

 same formulae hold good except that cal- 

 culations are made so that less of the spray 

 mixture is prepared at one time. 



With outdoor sweet peas, spraying 

 should begin as soon as the plants are six 

 inches high and should be continued until 

 the plants are about to lose their useful- 

 ness. The frequency of the applications 

 will depend largely on the weather. The 

 more it rains the more often spraying is 

 necessary. The object should be to keep 

 the plants covered a large part of the grow- 



