THE MONTHLY BULLETIN. 547 



Olive Orchard— Selection aud Care, M. B., V. IV, No. 9, 1915. 



Olive Outlook in California, M. B., V. IV, No. 9, 1915. 



Plums— Culture aud Handling of Shipping, M. B., V. Ill, No. 9, 1914. 



Prune Culture, M. B., V. II, Nos. 3 and 4, 1913. 



Rice in California, M. B., V. IV, No. 3, 1915. 



Street Trees and Parks (Pasadena), M. B., V. IV, No. 10, 1915. 



Street Trees and Parks (Riverside), M. B., V. IV, No. 8, 1915. 



Trypeta Ludens in Mexico, 1905. 



Walnut in Northern California, 35th Fr. Gr. Conv., 190S. 



The Monthly Bulletin : 



1912, Vol. I, Nos. 2, 3, 4. 



1913, Vol. II, Nos. 7, 8, 9. 



1914, Vol. Ill, Nos. 4, 6. 



1915, Vol. IV, Nos. 4, 9, 10, 11. 



Respectfully, 



E. J. VOSLER, 



Secretary State Commission of Horticulture. 



HOME MANUFACTURE OF LIME-SULPHUR 

 CONCENTRATE. 



By J. A. Prizer, San Diego Land Corporation, Chula Vista, Cal. 



In many districts of the citrus belt lime-sulphur solution has come 

 into general use. It has been found to be the most effective spray for 

 red spider, and its power to clean up the trunks and limbs of trees has 

 given it a secure place in the citrus orchard. As a red spider remedy 

 it is not entirely satisfactory; it will not kill the eggs, but along the 

 coast where the summers are too cool for dry sulphuring, there is no 

 recourse save to spray with this, the most effective contact solution, and 

 repeat the operation as often as necessary. Knowing the expensiveness 

 of this red spider control, and that it can be cheapened only by cutting 

 down the cost of the material, we were led to try out, and experiment 

 with, home-made solutions. 



Commercial producers and their agents would lead one to believe 

 that the building and successful operation of a lime-sulphur plant by 

 an inexperienced hand is impossible. Such, however, is not the case. 

 The plant is not expensive nor hard to put up, and the manufacture of 

 a good concentrate testing about 30 degrees Baume is a comparatively 

 simple operation. For a large grower or an association of growers it 

 is a paying proposition from the start. Any grower or association, 

 using a car or more of lime-sulphur solution (sixty barrels) a year — 

 it being presumed that he buj^s this material in lots of this amount in 

 order to take advantage of the lower price — has from $150 to $600 

 continually tied up in barrels and material — probably an average of 

 $200. This will cover the investment in a plant for home manufac- 

 ture, and if the grower can cut the cost of the solution in half, keeping 



