THE RUST MITE. 127 



Flowers of sulphur must, therefore, be regarded as one 

 of the cheapest and most effective remedies for rust mite, 

 and it may be used to great advantage in connection with 

 whale-oil soap and other insecticides. It may be sus- 

 pended in water and applied in spray. With proper ap- 

 pliance the dry powder may be sifted or blown upon the 

 foliage when wet with dew or rain. A little wheat flour 

 added to the powder would increase its adhesiveness. 



