652 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



limbs, where they remain until the following spring, thus 



spending some six months in 

 this condition." Quaintance. 

 Control. By spraying dur- 

 ing the winter, or preferably 

 after the buds have swollen 

 in the spring with kerosene 

 or distillate-oil emulsion, the 

 oil is absorbed by the cast- 

 ings at the mouth of the 



burrows of the hibernating 

 FIG. 503. Peach twig-borer in winter 



quarters: a, twig, showing in crotch larvae, and thus pel] 



minute masses of chewed bark above the burrows and kills the 



larval chamber; b. same, much en- , T . , f 



larged; c, larval cell enlarged; and larvffi - Lime-sulfur wash, ap- 



d, larva very greatly enlarged. (After plied from the time the buds 



Marlatt, U. S. Dept, Agr.) commence to swell until the 



first blossoms, has also been widely and successfully used. 

 The wash should be ap- 

 plied as late as possible 

 before blossoming. Recently 

 Mr. E. P. Taylor has shown * 

 that in western Colorado 

 the larvae are very readily 

 killed by arsenate of lead, 

 3 to 5 pounds per barrel, 

 applied just as the buds 

 are beginning to open. The 

 arsenate of lead must con- 

 tain no soluble arsenic, or 



it may burn the foliage. FlG ' , 



J new shoot of peach withering from 



This treatment is given at 

 the same season as the 

 lime-sulfur wash and is 

 much easier to prepare and apply. 



attacks of larvae; b, larva enlarged; 

 c, pupa, enlarged. (After Marlatt, 

 U. S. Dept. Agr.) 



*E. P. Taylor, Bulletin 119, Colo. Agr. Exp. Sta., p. 8. 



