ENEMIES OF THE ROSE 



87 



The following control or treatment may be effectively used in 

 the case of practically all these insects, to which might be 

 added the rose curculio, the 

 rose slug caterpillar, Fuller's 

 rose beetle, and the rose- 

 seed chalcis flies. 



Methods of Controlling Rose 

 Slugs. — A strong stream of water 

 from the garden hose if applied 

 every few days is very effective 

 in ridding the bushes of these 

 pests. The slugs may also be 

 killed by application of arseni- 

 cals. For this purpose, arsenate of 

 lead is preferable. It should be 

 applied at the rate of two pounds 

 in fifty gallons of water or bor- 

 deaux mixture ( = one ounce to 

 one and one-half gallons). Helle- 

 bore is also an effective insecti- 

 cide, and may be used at the 

 rate of one ounce in two or three 

 gallons of water, or dusted on 

 the foliage dry when diluted with 

 double its weight of powdered 

 plaster or cheap flour. Tobacco 

 extract (nicotine sulphate, or 

 "Black-leaf 40"), as recom- 

 mended for the control of the 

 rose aphid, will also be found 

 effective against the slugs.* 



Plants are occasionally troubled with rose scale, but scale 

 seldom bothers any except old, neglected roses. For this, the 

 lime-sulphur solution or "Scalecide" is quite effective, but best 

 of all is to cut off and burn the affected parts. 



Powdery Milde\v and Black-Spot doubtless do more to 

 discourage rose-growing among amateurs than all other rose 

 diseases combined. The American Rose Society evinced its 

 value to rose-growers when recently it engaged Prof. L. M. 

 Massey, Plant Pathologist of Cornell University, to run these two 

 "beasties" (as Burns might say) to cover, hoping thus to corner 

 them, and to teach us all how to overcome them and keep 



* 1922 "American Rose Annual," page 93. 



