118 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table I. — Treatments and dates of applications of sprays for the codling moth and plum 

 curculio. One-spray method. Siloam Springs, Ark., 1909. 



Dates of applica- 

 tions. 



Plat I. 



(One-spray method.) 



Plat LL 

 (One-spray method.) 



First application, 

 April 24-25 (after 

 falling of petals). 



Second application. 



May 25-26. 

 Third application, 



July 2. 

 Fourth application, 



July 22. 

 Fifth application, 



August 10. 



Drenched with arsenate of lead. 1 pound 

 to 50 gallons of water. Bordeaux noz- 

 zles. 17 gallons per tree. 200 pounds 

 pressure. 



Bordeaux mixture only (4-4-50). Bor- 

 deaux nozzles. 



....do 



Unsprayed 



...do 



Drenched with arsenate of lead. 1 pound 

 to 50 gallons Bordeaux mixture (3-3- 

 50). Bordeaux nozzles. 17 gallons 

 per tree. 200 pounds pressure. 



Bordeaux mixture only (4-4-50). Bor- 

 deaux nozzles. 

 Do. 



Unsprayed. 



Do. 



Dates of applica- 



Plat in. 



Plat IV. 



Plat V. 



tions. 



(One-spray method.) 



(Demonstration.) 



(Unsprayed.) 



First application, 



Drenched with arsenate of lead. 



Not drenched . Vermorel noz- 



Unspraved. 



April 24-25 (after 



1 pound to 50 gallons of water. 



zles. Mist sprav, arsenate 





falling of petals). 



"\ ermorel nozzles. Mist 



of lead. 2 pounds to 50 gal- 







sprav. 8.3 gallons uer tree. 



lons Bordeaux mixture (3- 







200 pounds pressure. 



3-50). 11 gallons per tree. 

 200 pounds pressure. 





Second application. 



Bordeaux mixture only (4-4- 



Bordeaux mixture (4-4-50) 



Do. 



Mav 25-26. 



50). Mist sprav. Y ermorel 



with 2 pounds arsenate of 







nozzles. 



lead. Mist spray. Vermo- 

 rel nozzles. 





Third application. 



do 



Bordeaux mixture (4-4-50) 



Bordeaux mixture 



July 2. 





with 2 pounds arsenate of 

 lead. Mist spray. Vermo- 

 rel nozzles. 



only (4-4-50). 



Fourth application, 



July 22. 

 Fifth application, 





do 



Unsprayed. 

 Do. 



do 



do 



August 10. 









Plats I, II, and III received an arsenical treatment of 1 pound of 

 arsenate of lead to 50 gallons of water immediately after the falling 

 of the petals. Two subsequent applications of Bordeaux mixture 

 only were made to protect the fruit from the apple blotch and bitter 

 rot and one Bordeaux treatment was also given to the check plat 

 (Plat V) for the same purpose, as these affections in this locality are 

 exceedingly troublesome and otherwise would have interfered 

 greatly with results. Plat IV, which received demonstration treat- 

 ment, received fixe applications in all, as shown, of a combined spray 

 of Bordeaux mixture and arsenate of lead, the latter being used at 

 the rate of 2 pounds to 50 gallons of spray. On the demonstration 

 plat the usual eddy chamber, or Yermorel nozzle, was used and while 

 an effort was made to spray thoroughly according to usual recom- 

 mendations hi the East, the drenching of the trees was carefully 

 avoided. Plat I, which received the one-spray treatment proper, 

 was very thoroughly treated and required an average of 17 gallons 

 per tree. The Bordeaux nozzle was used with a crook between the 

 nozzle and spray rod and a pressure was maintained at about 200 

 pounds. Plat II received exactly the same treatment except that 

 arsenate of lead was applied in dilute Bordeaux mixture to determine 



