INSECTS, DISEASES AND SPRAYING ' 67 



Do not use any poisons unless they are 



really necessary. 



Mid-April. Spray roses and neighbour- 

 ing trees with Bordeaux mixture. 



Late April. Just before leaves open. Whale- 

 oil soap. 



May loth. Leaves open. Potassium sul- 

 phide. 



May I yth. Potassium sulphide. 



May 2 1 st. Buds set. Whale-oil soap. 



May 24th. Potassium sulphide. 



June ist. H.P.'s begin to bloom. Potassium 

 sulphide. 



June 7th. H.P.'s bloom in quantity. Arse- 

 nate of lead. 



June I4th. H.P.'s bloom in quantity. Ar- 

 senate of lead. 



June2ist. H.P.'s bloom in quantity. Whale- 

 oil soap (last application). 



June 28th. H.T. and T. in quantity. Arse- 

 nate of lead. 



July 4th. H.T. and T.; H.P.'s bloom ends. 

 Arsenate of lead. 



July i ith. H.T. and T. in quantity. Whale- 

 oil soap. 



July 1 8th. H.T. and T. in quantity. Potas- 

 sium sulphide. 



