ONE-SPRAY METHOD FOE CODLING MOTH, ST€. 

 THE CODLING MOTH. 



131 



The treatments given and dates of applications are shown in 

 Table IX. 



Table IX. — Dates of applications for codling moth and plum curculio, one-spray 

 method. Crozet, Va., 1909. 



Date of application. 



Plat V. 

 ( D emonstration . ) 



Plat VI. 

 (One-spray method.) 



Plat VIII. 



(Unsp rayed.) 



First application, April 

 27 (after falling of 

 petals). 



Second application, 



Not drenched . Vermorel noz- 

 zles. Mist spray. Arsenate 

 of lead 2 pounds to 50 gallons 

 Bordeaux mixture (2-2-50). 

 Pressure 120 to 140 pounds. 



do 



Drenched with arsenate of lead 

 2 pounds to 50 gallons Bor- 

 deaux mixture (2-2-50). 

 Pressure 125-160 pounds. 

 Seneca nozzles. 11 gallons 

 per tree. 



Bordeaux mixture only (2-2- 



50). Not drenched. 

 do 



Unsprayed. 

 Do. 



May 24. 

 Third application, June 



do 



Do. 



26. 

 Fourth application, 

 July 26-27. 



do 



do 



Do. 



1 







Plat V (demonstration) received four applications in all, the Ver- 

 morel nozzle being used. The effort was made to spray thoroughly, 

 but none of the trees was drenched. Plat VI (one-spray method) 

 was thoroughly drenched, using Seneca nozzles, applying an average 

 of 11 gallons per tree. This plat received three subsequent appli- 

 cations of Bordeaux mixture only, as shown in the schedule, to pro- 

 tect the fruit from possible infection by bitter rot. Plat VIII was 

 left unsprayed throughout the season for purposes of comparison. 



The first application, on April 27, was given just after most of 

 the petals had fallen, and conditions were favorable for the work 

 except that showers interrupted the spraying for about one hour. 

 At the time of the second application, May 24, the weather was 

 showery, but spraying was finished without serious interruption. 

 The third application, on June 26, was interrupted near the close of 

 the work by rain, while the fourth application, on July 26, was made 

 under very favorable conditions, the weather being clear and dry. 

 Comparatively little bitter rot developed during the season, even on 

 the unsprayed plat. A heavy hail, however, which occurred during 

 late June, badly injured the fruit and foliage. It was noticed that 

 the hail injury to the fruit resulted in a much greater proportion of 

 codling-moth larvae entering on the side, and this fact must be taken 

 into account in the consideration of the results. 



Table X gives the total wormy fruit and fruit free from codling- 

 moth injury for the entire season for the eight count trees of each 

 plat, the numbers of the trees in the figure agreeing with those in 

 the table. 



