PROGRESS REGARDING SUGAR-BEET WEBWORM. 



63 



OTHER CHECKS. 



As previously noted, the webworms burrow into the soil about 

 the infested plants, and when the beets are plowed out at harvest 

 time many of the worms are crushed or are so deeply buried that 

 the moths, if they succeed in developing, are unable to leave the 

 tubes, and consequently perish. In spite of these checks there will 

 be every year some areas of greater or less extent where the web- 

 worms will occur in injurious numbers and where spraying or, other 

 artificial control measures will be necessary. 



Fig. 14. — Field of young sugar beets destroyed by the sugar-beet webworm in late June. 



(Original.) 



EXPERIMENTS WITH REMEDIES. 



During the time the writer has been stationed in the Arkansas 



Valley he has given special attention to means of controlling this 



webworm, and in his opinion spraying with Paris green has proven 



b} r far the most effective and satisfacton T remedy. The writer has 



made man} 7 experimental tests with a variety of insecticides and 



has also supervised a considerable amount of practical work against 



this species, as a result of which stud} 7 he considers the following 



formulas as most efficient : 



Formula No. 1. 



Paris green pounds 3 



Whale-oil soap do 6 



Water gallons 100 



Formula Xo. 2. 



Paris green pounds 3 



Lime do 3 



Water gallons__ 100 



