40 



April 8, eleven days after the treatment, there was a drivino- rain all 

 day. Rain fell in varying amount at eight different times during 

 the course of the thirty days following the application of the wash. 



A slight variation was made in the treatment applied to two rows 

 of apple trees, which might here be mentioned. These trees were 

 sprayed with the usual lime, salt, and sulphur wash, to which refined 

 glue had been added at the rate of 3 pounds to the l)arrel of water. 

 An appreciable difference in the effectiveness of this wash was to l)e 

 noted, an increased percentage of scale of not less than 18 or 20 per 

 cent having been killed. 



In the foregoing tests the results were decidedl}^ disappointing, so 

 far as the effectiveness of the wash was concerned, but considered in 

 connection with the weather conditions which prevailed it is not 

 likely that applications of other insecticides would have given any- 

 thing like usual results. 



Experiment III. — The third test of the wash was made in an orchard 

 of 5-year-old peach trees on the farm of Mi'. S. S. Stouft'er, Sharps- 

 burg, Md. A block of about 50 trees was selected and treated with the 

 wash on March 22, the da}" being 1)right, warm, and calm. Two formulae 

 were used, the 40-15-20 to 00 gallons of water, and the 30-8-12^ to 

 50 gallons of water. The rains which occurred, as reported by Mr. 

 Frisby Smith, who also applied the spray, are as follows: 



March 28. Light rain. 

 April 8 and 9. Heavy rain. 

 May 19. Heavy thunder storms. 

 May 25. Heavy thunder storms. 



The trees in this plat were examined June 19, and the results were 

 quite different from those previously recorded. Live scales were quite 

 hard to find, although some trees were rather badly infested with 

 them. On the whole, the percentage killed was placed at from 98 to 

 99 per cent. No appreciable difference was to be noted in the results 

 from the different fornuila?. The trunks and larger limbs were still 

 coated with the wash, so that the scales were considerably obscured. 



The lime, salt, and sulphur wash was used by Mr. Stouff'er one year 

 ago this spring on a part of his orchards with gratifying results, and 

 his entire orchard was sprayed with it the present spring. Three years 

 ago the scale was very serious in this orchard, some trees having- been 

 killed and many seriously injured. At the present time the insect is 

 under complete control, and no fear is now felt as to the possibility 

 of keeping it in check with this treatment. 



