112 

 Table VI 



COMPARISON OF BOILED EMULSIONS WITH LIME SULFUR AND 

 VARIOUS MISCIBLE OILS 



During the spring of 1933, a number of tests were made with 

 the various spray materials listed below. As the question of thorough- 

 ness of application has often been raised in connection with control of 

 San Jose scale, it was obvious that if our final results were to be de- 

 pended on, all treated branches must have been very carefully covered. 

 All sprays were applied with a small hand-sprayer, previously marked- 

 ofT areas on the various branches being sprayed individually and from 

 all angles, and spraying was continued imtil the operator was sure that 

 the solution had covered every scale. This method eliminated the chance 

 — always present in orchard experiments — of taking samples from a 

 part of the tree which had been missed or only partly wet in spraying. 

 Four to eight weeks after the sprays were applied, a number of scales, 

 usually a thousand from each treatment, were examined under a bi- 

 nocular microscope to determine the percent of scale surviving. These 

 examinations were made by at least two persons within a few days 

 after the sample branches were cut from the tree. The scales on these 

 trees were carefully examined in the beginning of the experiment as 

 were also the untreated checks on the same trees at the end of the work. 

 Tahle VII 



