October, '15] 



MELAXDER: SAX JOSE SCALE 



475 



FIELD NOTES ON GRASSHOPPER OUTBREAKS 



By E. D. Ball, Logan, Utah 

 (Withdrawn for piihlication elsewhere.) 



Adjourned 4.30 p. m. 



Morning Session, August 10, 1915 



The session was called to order at 10.15 a. m. by Vice-President 

 Cooley. 



Vice-Presidext Cooley: The first paper will be read by ^Ir. 

 C. E. Pemberton. 



THE EFFECT OF COLD STORAGE TEMPERATURES UPON 

 THE EGGS AND LARV^ OF THE MEDITERRANEAN 



FRUIT FLY 



By E. A. Back and C. E. Pembektox, Honolulu, T. H. 

 {Withdrawn for publication elsewhere.) 



Vice-Presidext Cooley: The next paper is by ]Mr. A. L. Melan- 

 der. 



VARYING SUSCEPTIBILITY OF THE SAN JOSE SCALE TO 



SPRAYS^ 



By A. L. Me LANDER, Pullman, Wash. 



There seems to be no doubt but that sulphur-lime has ordinarily 

 been a most efficient scalecide. In the arid region at Wawawai, Wash- 

 ington, Piper twelve years ago was able to announce complete destruc- 

 tion of the San Jose scale in one to two weeks after the application. 

 Similar quick results have been observed in recent years with scales 

 from Wenatchee. On the other hand, this insect is becoming increas- 

 ingh' prevalent in some of the older fruit sections of Washington, nota- 

 bly at Clarkston, and a critical investigation shows that not onh' are 

 the scales slow to succumb to the effects of sulphur-lime but that there 

 is a pronounced and great individual difference, many scales mani- 

 festing even a complete immunity to this insecticide. 



^ Contribution from the Zoological Laboratory of the State College of Wasliington. 



