160 



STATE BOARD OF AGRICULTURE. 



silken tube about three quarters of an inch long, and in this tube the 

 pupal stage is passed. In the early broods the pupal stage is of short 

 duration, but the members of the last brood remain in the tubes over 

 winter. There are sej'eral generations each year. 



REMEDIES. 



Spray with paris-green on the first appearance of the larvae, using 

 lime as indicated in the directions for preparing insecticides. Use 

 one pound of the poison to one hundred and seventy-five gallons of 

 water. Plow the field after harvesting the beets, so as to expose the 

 pupae to the birds. In spraying, use a nozzle set at right angles to 

 a short extension, so that it will be easy to spray upward from beneath. 



Fig. 4. — Beet web-worm, adult, and silken tube in which pupal stage is passed, enlarged. Original. 



Fig. 5. — Beet web-worm, e arged. (Author's illustration.) 

 Zebra Caterpillar {Mamestra picta). 



A very general feeder is the zeora caterpillar; cabbage, cauliflower 

 and other plants of that type seem most to its liking, but the beet does 



