29 



intovforo Avith tbo nutrition of the coll by destroying the chlorophyll 

 unci setting' up other ehunges whieh tinally result in cletith. 



(12) Besides the carnation and dilierent species of Dianthus, many 

 other plants react similarly to the puncture of aphides and other suck- 

 ing insects, and also to mites. 



(13) The grower can suecessfulh' combat this disease by the proper 

 selection of cuttings; careful propagation of stock; good soil; the 

 proper amount of moisture, light, and air; and by the reduction of 

 aphides, thrips, and red spiders to a minimum. 



