INSECTS IXJURIorS TO THE SUGAR-BEET. 



263 



be destroyed by dusting or spraying arsenical poisons on 



the leaves. ' ' * 



Plant-bugs. 



The Tarnished Plant-bug [Lygus pratensis), False 

 Chinch-bug {Kysius angustahis), and several of the 

 common plant-bugs often become so numerous as to do 

 considerable damage. When present in large numbers, a 

 spray of kerosene emulsion or kerosene and water might 



Fig. 150 — The False Chinch-bug {JVysivs angustatus . (After Riley.) 



Fig. 151. — Tarnished Plant-bug [Li/gus p)'aie?is's Linn.). «, young, 

 first stage; b, young, third stage (X3); c, adult (x2) — all en- 

 larged. (After Stedman.) 



be used to great advantage. Recent experiments in New 

 York show that the Tarnished Plant-bug can be driven 

 from, a field by dusting the rows with wood-ashes, beiug 

 careful to work on the same side of each row and thus 

 gradually driving them into the field adjoining. 



* Forbes and Hart, 1. c., facts derived from statements of Prof. C. 

 P. Gillette. 



