454 EXPERIMENT STATION RECORD. [Vol.40 



6 gal. of Orchard brand lime-sulphur. 2 gal. of miscible oil (Triumph), and 1 lb. 

 of ground glue per 200 gal. spray tank. In preparing the spray 5 lbs. of ground 

 glue was placed in an empty 5-gal. coal oil or gasoline can. This was covered 

 with a sufficient amount of cold water to make it into a paste, then 2 or 3 gals, 

 of hot or cold water were poured into the can and the solution heated until all 

 the glue was thoroughly dissolved, whereupon sufficient water was added to 

 make 5 gal. One gal. of the glue solution was then stirred Into 2 gal. of the 

 miscible oil, and the mixture was stirred while water was added sufficient to 

 make 5 gal. of a thin, creamy emulsion. This emulsion was added to the lime- 

 sulphur solution in the spray tank just as the spraying was begun. Application 

 of this spray is said to have resulted in the immediate destruction of all the red 

 spiders on both surfaces of the leaves. 



" The spread of the spray was very great, covering all portions of the trees 

 with a very line film, and no trouble was experienced at all in breaking down 

 beyond the point intended. After the contact value of the formula had been 

 obtained, secondary killing results showed up over quite a period of time in 

 the action of the free sulphur fumes on the young red spiders batched from the 

 eggs. The fumes of this solution were very much in evidence for a lon:_ r period 

 after application, and this secondary killing or 'mopping up' was carried out 

 very efficiently. It Is evident that the oil, with what was left of the calcium 

 DOlysulphldS and the sodium and potassium SUlphlds, did all the contact work 

 on the adult red spiders, while the tree sulphur continued to act on the young 

 hatched from the eggs. The lime in the sulphur and free lime formed, together 

 with the very Increased spread and tine film over the trees, tended to shade over 

 the spray so as not to cause injury, and the Increased spread also kept the liquid 

 from gathering in such large drop- when drying. . . . 



"For general work throughout the State where there is not an extensive 

 fungus condition, or this problem is not to be taken into consideration, it is 

 probable that it will not be necessary to use this formula Btronger than 4 gal. 

 lime-sulphur, l gal. miscible oil (Triumph), and l lb. glue to 200 gal. spray 

 tank. And it is suggested that this formula be used especially on prunes which 

 have the fruit on them, or on citrus trees, although the stronger formula has 

 been used with great success on the gray scale {Coccus oitricola) in Tulare 

 County, during the months of July, August, September, and October, and even 

 stronger solutions during the winter months. 



"It is a question whether the mark left by the Ume-SUlphur, when used at 

 the weaker strength, would have any had effect on prunes, Inasmuch as they 

 are dipped before marketing. However, there might be some difficulty in this 

 respect on canning peaches. No trouble was experienced in this respect on 

 almonds or on oranges, as the lime-sulphur came off very readily or else did 

 not show any marks at all at lacking time." 



The mixing of oil emulsions with lime-sulphur solutions, YV. YV. Yothkus 

 (/•7a. Qrower, 18 (1918), No. 18, p. 4)- — The author reports upon the use of oil 

 emulsions mixed with lime-sulphur solution, as recommended by Jones in the 

 article above noted. 



In following the directions given by Jones it was found that when the glue- 

 misdble oil combination was added to the lime-sulphur solution a granular 

 scum formed, but this was readily stirred up and apparently formed a fairly 

 good mixture. It is pointed out that, owing to the forming of a granular scum 

 on the surface of the solution, it will he necessary to use an agitator in app y- 

 Ing it to the trees, otherwise the granular scum will he at the bottom of the 

 tank when nearly empty and will then be applied to the trees in a concentrated 

 state and cause much damage. 



