Family Araliaceae 115 



Strong solutions will not injure the plants but are 

 unnecessary. 



Root Knot, see Nematode 



Papery Leaf Spot 



Caused by drought. 



Symptoms. The trouble appears as thin, papery 

 whitish to yellowish, transparent spots between the 

 veins and along the margins of the leaves. This 

 spotting is often mistaken for Bordeaux injury or 

 for Alternaria blight. 



Cause. Papery leaf spot is brought about by a 

 lack of sufficient moisture in the soil. Drought, large 

 tree roots in the beds, or insufficient shading may 

 deprive the plants of the amount of soil moisture 

 which they require. Control measures should con- 

 sist in eliminating as far as possible those factors 

 which are conducive to drought. 



Bordeaux Injury 



. This form of injury is brought about when spray- 

 ing with Bordeaux mixture which is followed by frost. 

 Affected plants appear scalded, soft rot, and finally 

 they dry and become papery (fig. 19 m). As a pre- 

 caution plants should not be sprayed during periods 

 when frost is predicted. 



