398 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 15 



Row Date of Ap- Material and Type of 

 No. plication Application 



1922 



Table 2 (Continued) 

 Dilution 



No. of 

 Trees 



No. of 

 Larvae 

 found. 



%of 

 Infes- 

 tation 



%of 

 Con- 

 trol 



22 

 23 



24 

 26 



29 



16 

 17 



18 

 19 



21 

 22 



23 



26 



27 

 27 



28 



29 



2/11 

 2/14 



2/18 

 2/18 



2/4 



[ Nicotine sulphate H pt.-lOO gals. 



I plus Soap 3 lb. 



I Lime-Sulphur, plus 1 in 10 

 Arsenate of Lead powder 4-100 



( Zinc Arsenite 

 ( Casein 



(Arsenate of Lead, 

 < powdered, 

 (Casein 



/Bordeaux Mixture, 

 J plus 

 J Lead Arsenate 

 I. Powder (neutral) 



2-100 



J<-100 



4-100 



K-lOO 

 4-5-50 



8-200 



Full Bloom 

 1 in 25 

 1-25 

 3/i pt.-lOO 



3/5 (pink Sulco V-B 

 3/5 stage) [ Sulco V-B 



( Nicotine Sulphate 

 3/13 Dry lime-sulphur (S-W) 12-50 gals, 



3/5 (pink Miscible Oil 1-16 



stage) (Spra -Mulsion) 

 3/13 " " Liquid Lime-sulphur 



("Rex") 

 3/13 "" ( Nicotine sulphate 



( plus Soap 

 3/13 " " (Lime-sulphur '•Rex"l in 10 



■<plus Arsenate of Lead 3-100 



( powder 

 3/14 " " (Zinc Arsenite, pow' 



■<dered 



(plus Casein 



3/14 



3/20 

 3/16 



3/21 



3/16 



lin 10 



K pt.-lOO gals. 

 3 lbs. 



2-100 



(Are; 

 •jpoM 

 <Cas 



K-lOO 

 4-100 



rsenate of lead, 

 ^powdered, 

 ?asein 

 Nicodust 



{Magnesium Arsenate 

 Casein 



(Dry Arsenate of LeadlO lbs 

 (Powdered Hydrated 



lime, 

 Bordeaux Mixture, 



K-lOO 

 5% 

 3-100 

 K Ib.-lOO 



30 lbs. 



4-5-50 



137 



1 



2 



38 







16 



10 



I Lead Arsenate 



\ powder (neutral) 8-200 

 Unsprayed trees. 

 Average rer unsprayed tree ... , , • 



Note- Three larvae per tree were taken as a basis in calculating per 

 occurred on the following dates: 2/9, 2/10, 2/18, 2/19 and 2/20. First 

 March 1. 



4.7 

 9.4 

 1.58 

 



23.8 



9.4 



34 141.7 



4 16.66 



66.66 



47.6 



100 



95.5 

 80.6 

 -58 

 100 



76.2 

 87.5 



80.7 



100 



-41.7 

 83.33 



33.33 







367 

 3 



cent of infestation. Rains 

 bloom of Almonds recorded 



Tahtf 3 Peach Twig-Borer Control Experiments, University Farm, Davis, Summary of 



Results. 1921-1922 



Percent Percent Average 



Control Control Percent 



1921 1922 Control 



Material and Type of Application 



Liquid Lime-sulphur 



Dry Lime-Sulphur 



Nicotine sulphate 



Lime-sulphur, plus Arsenate of Lead 



Liquid lime-sulphur ("Rex") 



Dry lime-sulphur 



Spra-Mulsion 



Nicotine sulphate 



Arsenate of lead 



Lime sulphur, plus Arsenate of lead 



Liquid Lime-sulphur 



Dry Lime -sulphur 



Spra-Mulsion 



Zinc arsenite 



Nicotine sulphate 



Arsenate of lead 



Lime sulphur, plus Arsenate of lead 



Trees Dormant 



Buds Swelling 



Full Bloom 



