64 



tionable. Color not a safe guide. Keep pellets and lumps of sul- 

 phur broken during the cooking. 



Storage : A\'oid acids, CO2, and unnecessary contact with air. 

 Use oil films or tight, well-filled containers. Three-year old sam- 

 ple at the college unchanged. Crusts formed in storage may be re- 

 dissolved, diluting as usual according to density. 



Dilution: fa) Process zvifli specific gravity hydrometer. 



Rule : Decimal of concentrate divided by decimal of desired 

 spray equals total dilution. 

 Examples : — 



.24 .24 .27 .27 



— = 8 or - — := 24 or — — 38 4-7 or — = 90 

 .03 .01 .007 .003 



This means that a concentrate testing 1.24 is to be diluted to i 

 to 8 (total) to get a winter spray for scale, which should test 1.03, 

 etc. 



(h) Other methods: Dilution tables and floating hydrometer 

 in diluting vessel. Latter is unreliable as an indicator of proper 

 water addition, difirusion too slow. (For further discussion of these 

 and other matters pertaining to lime-sulphur, see our Bulletin 115.) 



Densities and Application Times for Different Purposes. 



Sail Jose Scale, 1.03. trees dormant; or i.oi in summer at 

 ''hatching" time, followed by i or 2 later applications at ten-day in- 

 tervals or as young reappear. Other scales, same. 



Blister mite, 1.025. just as l)uds begin opening. 



Peach leaf curl, T.02, just before the buds open. 



Apple and Pear Scab and apple worm. About 1.007 with lead 

 arsenate if three applications are given; i.oi alone, or with the 

 arsenate if only one application is given. Applications: (i) \\^hen 

 blossoms are beginning to show pink; (2) May begin when petals 

 are two-thirds oft' and finish w^ithin ten days thereafter; (3) About 

 two weeks after second application. 



BroK'u Rot. Ciircnlio and Scab of stone fruits, (i) Lead 

 arsenate, lime and water (2-2-50), when calyces or ''shucks" are 

 shedding. (2) Self-boiled lime-sulphur. 8-8-50, and 2 pounds lead 

 arsenate, about a month later. (3) Clear lime-sulphur solution. 

 1.003, or self-boiled lime-sulphur, without any arsenical, about 3 or 

 4 weeks before fruit ripens. The former alternative in (3) avoids 

 staining of fruit, is cheaper and handier and has been satisfactorily 

 safe in our tests the past two seasons. It should not be used exten- 

 sively however, without preliminary trials in the locality and on the 

 particular varieties to be sprayed. Peach spraying not 3'et as un- 

 qualified a success as apple spraying. 



Spray Injury. 



Sometimes very important. When the sulphur solution is used 

 at proper densities, the injury may follow excessive applications 



