17 



p. m., July 18 ; sun shining*, light breeze. August G, leaves uninjured ; 

 found fourteen live red scales. The pupae and recently transformed 

 adults of the Ohalcid fly, Dilophogaster califomica Howard, which in- 

 fested fully 80 per cent, of the black scales (Lecanium olew Bernard) 

 on this tree, were all of them destroyed by this spray. 



(187) Resin 2§ pounds, tallow 14 pounds, crude potash 5J pounds, 

 water to make 100 gallons; costs $1.10. Sprayed on a lemon tree at 

 4.30 p. m., July 17 ; sun shining, light breeze, August 6, leaves unin- 

 jured ; found three live red scales. 



(185) Resin 19 pounds, water to make 100 gallons; costs 38 cents. 

 Sprayed on an orange tree at 4 p. m., July 17; sun shining, light breeze. 

 August 6, leaves and newest growth uninjured, but few of the red scales 

 were destroyed. 



(186) Resin 22 pounds, water to make 100 gallons; costs 44 cents. 

 Sprayed on a lemon tree at 4.15 p. in., July 17 ; sun shining, light breeze. 

 August 6, same as in the preceding experiment. 



EFFECTS OF THE EUREKA. INSECTICIDE ON THE RED SCALE. 



On the 1st of August of the present year I received a letter from 

 Acting Entomologist Howard, dated July 25, 1889, requesting me to 

 make a test of the " Eureka Insecticide," put up by E. Bean, of Jack- 

 sonville, Fla., who would forward me a few sample cans of the insecti- 

 cide for this purpose. These samples reached me in due time, and I 

 carefully tested the preparation according to directions. One pound 

 of it was emptied into a vessel, 6 gallons of cold water added, and the 

 whole frequently stirred. After the lapse of one hour I allowed 

 the insoluble portion to settle to the bottom of the vessel, poured oft' 

 the clear liquid portion, and sprayed it upon an orange tree at 2 p. m., 

 August 7 ; cloudy, light breeze. September 2 the leaves were unin- 

 jured, and I could not discover that any of the red scales (Aspidiotus 

 aurantii Maskell) that were encased in a scale or shell at the time the 

 application was made had in the least been affected by the spray. 



In a circular received from the proprietor it is stated that this insecti- 

 cide is sulphur in solution, a patented process, and that it " is abso- 

 lutely fatal to the rust mite, and also to the scale insect during the 

 breeding or migratory periods," providing that the applications extend 

 through the entire season. It is possible that this insecticide would 

 prove fatal to the recently hatched red scale, but as this becomes cov- 

 ered over with a shell inside of twenty-four hours after leaving the 

 parent, and as the young ones appear during almost every day in the 

 year, it follows that in order to be effective it would be necessary to 

 apply this insecticide every day for three or four months consecutively 

 — a task which very few of our fruit-growers would be willing to per- 

 form. 



23479— STo. 22 2 



