^(^ MASS. EXPERIMENT STATION BULLETIN 226. 



1. A tliorougli application of tlie calyx spray. This is very important. 

 Upon it depends freedom from "blossom end" injury, and lessening the 

 danger of a large second brood. 



2. The cover or post-calyx spray is aln\ost etjually important. It de- 

 mands even more caie from thei grower as to the proper time of ap- 

 plication. Upon this depends protection over the long period during which 

 larvae are appearing, and relief from early "side worm" injury. 



The exact date for this spray, and the number of applications that 

 may be necessary cannot be stated absolutely. These must be determined 

 each season, as thej' are governed largely by weather conditions From 

 the experience we now ha^■e, two applications at intervals of two weeks 

 after the calyx spray have given excellent residts. A tliird ap])lication may 

 be advisable should the season be unusually "early." 



3. If the season is "early," there will be the probability of a large 

 second brood. The bulk of this brood apjiarently comes about the first 

 of August each year, whatever the type of season up to that time. With 

 a brood of such size as that of 192.5, a si)ecial application in early August 

 IS necessary to avoid serious late "side worm" injury. 



TESTS OF LIME-SULFUR SOLUTION AND 

 SOME OF ITS SUBSTITUTES AGAINST SAN JOSE SCALE 



BY A. I, BOURNE 



While under eastern conditions, at least, lime-sulfur solution has long 

 been recognized as the standard dormant spray for the control of 

 San Jose scale, yet fruit growers are niucii interested in the various dry 

 jiowders now offered as substitutes for the concentrated solution. Trans- 

 portation charges are less, there is no danger of freezing and no loss from 

 leakage. L'sed in strengths recommended, these dry powders furnish less 

 polysulfide sulfur than does the concentrated liquid used at standard dilu 

 tion of one part to eight parts of water. 



This situation led the Experiment Station to undertake a test of these 

 different materials with the purpose of finding whether the dry materials 

 are effective, and how dilute the liquid concentrate may be used and still 

 be effective, for scale control. 



All the materials used in the tests were of standard brands purchased 

 in the open market. A chemical analysis of each brand was made, as 

 shown in Table 1. 



Table L Polysulfide sulfur and free sulfur in the materials tested. 



Polysidfide Free or Inert 



Sulfur, Sulfur, 



Per cent. Per cent. 



Lime-sulfur solution (33°-i-Beaunie) 25-|- — 



Dry lime-sulfur .5.5-j- 6 



Sodium sulfur compound 4'1+ 3 



Barium sulfur compound 21+ 1^ 



The materials were used at the strengths recommended by the manu- 

 facturers for scale control, and printed on the label or the container; 



