14 



FUNGI AND FUNGICIDES. 



POWDERY MILDEW OF THE ROSE. 



This disease is too well known to the lovers of tea roses to 

 need much description. It is the white powdery fungus which 

 is so often seen on the new growth, leaves, and buds of the 

 rose bush, marring the beauty and blasting the buds of many 

 of our choicest varieties. 



If taken in hand when it first makes its appearance on the new 

 growth, dusting with sublimed sulphur will check its spread. 

 Spraying with the Bordeaux mixture (diluted formula), just 

 before the new growth starts, will prevent its appearance. 



FIG. 10. Rose rust. 

 ROSE RUST. 



This disease confines itself to the hybrid perpetual roses, 

 and is easily recognized by the orange-colored spots on the 

 under side of the leaves, which in very bad cases become 

 entirely covered. 



After pruning rose bushes in the fall, they should be thor- 

 oughly sprayed with the Bordeaux mixture (formula B). All 

 leaves should be gathered and burned, as these contain the 

 winter spores. If the fungus was very severe during the 

 season, spraying again in the spring, just when the growth 

 starts, with the ammoniacal copper carbonate solution or the 

 Eau Celeste solution, will greatly aid in checking the trouble. 



