47(5 



THE MONTHLY BULLETIN. 



the eyanofuiner, eleven of which in connection with 600 tents were operated success- 

 fully. With the knowledge gained from the previous season's experience there was 

 less hesitation about using big dosages at high temperatures, and 2,000 acres were 

 treated with almost no damage and splendid results in all but two or three cases, 

 where the comparatively poor kill could never be explained. 



In 1916, work was begun on July 17. when the hatch was practically complete, 

 most operators using the 110 schedule from the first, and continued until October 30, 

 with a schedule of 120 in general use after September 1. Practically no damage 



Fig. 145. The gray citrus scale, Coccus citricola, Campbell. Full grown 

 female on orange twig. Enlarged three times. (After Essig.) 



resulted from the high dosages and a splendid kill of scale was effected. The time 

 of exposure varies from 40 to 60 minutes, some growers insisting on the latter time. 

 Personally, we believe that after 45 minutes, the loss in time is more than the gain 

 in efficiency. 



The present season opened on July 16 and soon after that date there were 750 

 tents in operation with twelve cyanofumers and two crews using the new liquid gas. 

 Results with the latter, so far as examinations have been made, compare favorably 

 with cyanofumer work, but it is yet too early to pass judgment. 



Every crew is visited at least once each night by an inspector of this office, and 

 as no one knows at what time he will appear, there is no doubt about this having a 



