150 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Plat 6, resin-soda wash. — The following formula was used: 



Resin pounds. . 10 



Caustic soda do 3 



Fish oil do 1 J 



Water gallons. . 50 



The resin was broken into small lumps and together with the caustic 

 soda placed in a kettle with 10 gallons of water. The mixture was 

 then boiled for about hah an hour, and while boiling 1 J pounds of fish 

 oil were added; it was then poured into the tank and diluted with 

 sufficient water to make 50 gallons of the wash. 



Plat 7, commercial lime-sulphur solution (1-8). — Six and one-fourth 

 gallons of the concentrated lime-sulphur solution and 43| gallons of 

 water were used to make 50 gallons of spray. 



Plat 8, borax. — Ten pounds of borax were used in 50 gallons of water. 



Plat 9. — For purposes of comparison this plat was left unsprayed. 



The respective treatments and results of same are shown in the 

 following table : 



Table I. — Results of spraying for the European fruit Lecanium, San Jose, Cal., 1909. 



Plat 

 No. 



Treatment. 



Distillate-oil emulsion 



Distillate-oil emulsion and caustic soda. . . 

 Distillate-oil emulsion, mechanical mix- 

 ture 



Caustic soda 



Crude-oil emulsion 



Resin wash 



Commercial lime-sulphur wash No. 1 



Borax 



Check 



Feb. 

 ..do. 



.do., 

 .do., 

 .do... 

 .do... 

 .do... 

 .do... 

 .do... 



First examina- 

 tion, Feb. 22, 190E 



51 



x d 



-SB 



305 



467 

 100 

 90 

 180 

 400 

 200 

 325 



- ct 



304 

 426 



465 



180 



400 

 200 



14 



100 

 100 

 100 

 100 

 4 



Second examina- 

 tion, Mar. 6, 1909. 



"I 



a « 



3 CD 



647 



216 



194 

 122 



30 

 252 



64 

 730 



640 



118 

 179 

 78 

 21 



17 

 28 

 71 





Treatment. 



Third examina- 

 tion, Mar. 26, 1909. 



Fourth examinaton, 

 July 1, 1909. 





Plat 

 No. 



to 

 co «j 



& 5 



Is. 



1 

 -3 . 



CO 



© c3 

 g to 



CO 



»■§ 



to c3 

 fg 



® rS 



go 



CD'S 



P4 



Fifth examination, 

 Dec. 13, 1909. 



1 

 2 



Distillate-oil emulsion 



Distillate-oil emulsion and 

 caustic soda. 



Distillate-oil emulsion, me- 

 chanical mixture. 



290 

 234 

 219 



65 



94 



65 



248 



107 

 142 



290 

 234 

 219 



61 



94 

 54 

 44 



31 

 24 



100 



100 



100 



94 



100 



83 



15 



29 

 17 



Scales all dead; lichens 



dead. 

 ....do 



Scales all dead; lichens 

 dead. 

 Do. 



3 

 4 



do 



do 



Do. 

 Do. 



5 





....do.... 



Do. 



6 





A few live scales 



A number of live 



scales; lichens dead. 



. ...do 



Do. 



7 

 8 



Commercial lime-s u 1 p h u r 

 wash No. 1. 



A number of live 

 scales; lichens dead. 

 Do. 



9 



Check 



Scales nearly all alive; 

 lichens flourishing. 



Scales nearlv all alive; 







lichens flourishing. 



