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 10th. — Leaves open. Potassium sul- 

 phide. 



May 17th. — Potassium sulphide. 

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

 May 24th. — Potassium sulphide. 

 June 1st. — H.P.'s begin to bloom. Potassium 

 sulphide. 



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

 nate of lead. 



June 14th. — 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. andT.; H.P.'s bloom ends. 

 Arsenate of lead. 



July nth. — H.T. and T. in quantity. Whale- 

 oil soap. 



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

 sium sulphide. 



