CONCENTRATED LIME-SULPHUR MIXTURES:* 
Ue Pe ap URAC 6 he 
SUMMARY. 
During recent years commercial preparations of the lime- 
sulphur wash have been introduced into this State, and in 
several centers of fruit production they have been extensively 
used to combat certain injurious insects and plant diseases. 
Thorough spraying with these mixtures at effective strengths 
has generally given satisfactory results on the scale and 
blister-mite; and the experiences of many large orchardists 
indicate that the best commercial brands are efficient substi- 
tutes for the home-made wash for these pests. 
Analyses of samples of commercial mixtures sold in the 
State during the spring of 1gog showed some brands to vary 
in the density of the clear solution and in the amount of sedi- 
ment they contained. The range of density was from 26.8 to 
33.9 degrees Beaumé, and the variation in sediment was from 
o to 19.42 per ct. 
Compounders of certain brands have established a standard 
strength for their lime-sulphur solutions, which is guaranteed 
to the purchaser. These preparations consist of a clear reddish 
liquid, which is free from sediment and tests between 32 and 
34 degrees Beaumé. Brands that show considerable variation 
in their chemical or physical composition should be avoided. 
Field experiments to test the value of the sediment of a com- 
mercial lime-sulphur mixture in controlling the San José scale 
*A reprint of Bulletin No. 320. 
[414] 
