Introduction 



2. Leaves blotched with whitish green. Not abnormally curled. 



Look for: Plant-lice (pages 111-116), 

 Leaf-hoppers (pages 123-128). 



3. Leaves blotched with purple (Figure 1, Plate VIII, Page 25). 



Look for Leaf-hoppers (pages 123-128). 



C. Leaves with portions of blade or stem eaten away. Sometimes 

 crowns of beets eaten also. 



1. Leaves eaten full of small holes (Figure 1, Plate IV, Page 17). 



Injury most apt to occur during spring and early summer. 



Look for Flea-beetles (pages 91-93). 



2. Leaves more or less completely eaten, or portions eaten from mar- 



gins (Figure 11, Plate III, Page 15). 



a. Leaves often more or less covered with a fine whitish web. 



Damage caused by worms about one inch long when fully 

 grown. Worms very active, throwing themselves from the 

 plant when disturbed. Often hanging from leaf by a single 

 thread of web, especially when young. 



* Worm dark green, striped, several dark circular spots on 

 each segment of the body (Figure 6, Plate V, Page 

 19). Web when present usually on blade of leaf near 

 its base. Heart leaves usually eaten last. Excrement 

 of worms scattered over leaves in form of small dark 

 pellets. 



Sugar Beet Webworms (pages 67-78). 



** Worm lighter than webworm. A pink or flesh-colored 

 stripe on each side (Figure 1, Plate VI, Page 21). 

 Web often among heart leaves. A long tube leading 

 from web to clods on the surface of the ground. Worm 

 usually concealed at end of this tube when not feeding. 



Alfalfa Webworms (pages 84-85). 



b. Leaves not webbed. 



* Damage occurring during spring and early summer, while 

 beets are still small. 



° Damage usually most severe on wet alkali land or 

 near such land. 



Look for Alkali-beetles (pages 89-90). 



00 Damage not associated with alkali land. Usually 

 most severe near alfalfa, ditch banks, fence rows 

 or waste land. Edges of leaves eaten. In severe 

 cases entire plant destroyed. 



Look for Spinach Carrion-beetles (pages 

 94-95). 



