122 



Journal of Agricultural Research 



Vol. XII, No. 3 



ceptible to the disease. A study of the total bitter-pit as given in the 

 last column of Table VI shows effects from irrigation similar to those 

 obtained on Grimes apples. The fruit from the trees receiving medium 

 irrigation followed by heavy irrigation late in the season had the most 

 bitter-pit, and that from the trees irrigated heavy both early and late 

 the next in amount. As has already been mentioned, the contrast 

 between plats i and 2 in the amount of irrigation was not as great as 

 intended; the latter, however, received less water and had less pit than 

 the former. Plats 2 and 5 had but little bitter-pit, even on the large 

 apples. The fruit from plat 2, however, was of an inferior quality on 

 account of the sunscald that resulted from the defoliation of the trees. 



Table VI. — Percentage of Jonathan apples affected with bitter-pit. November 10, IQI5 



Plat 

 No. 



Irrigation treatment. 



Percentage 



of apples of 



following 



sizes. 



Larger 

 than 



inches 



inches 



small- 

 er. 



Percentage of apples affected with bitter-pit. 



First 

 picking. 



Ap- 

 ples 

 larger 

 than 

 . iVi 

 inches 



Ajj- 

 ples 



inches 



or 

 small- 



er. 



Second 

 picking. 



Ap- 

 ples 



larger 

 than 

 2H 



inches 



Ap- 

 ples 



inches 

 or 



small- 

 er. 



Third 

 picking. 



Ap- 

 ples 

 larger 

 than 

 2H 

 inches 



Ap- 

 ples 



inches 

 or 



small- 

 er. 



Total. 



Ap- 

 ples 

 larger 

 than 

 2H 

 inches 



Ap- 

 ples 



inches 



or 

 small- 



Large 

 and 

 small 



Heavy 



Medium 



Light 



Medium, followed by heavy 



Heavy, followed by severe 



drouth 



91.9 



82.4 

 66.9 

 92.9 



49.8 



8.1 

 17.6 



33-1 

 7-x 



so. 2 



32-9 

 32- S 

 13-7 

 44.4 



4-S 



22.7 

 S-9 

 8.2 



16.7 



4.4 



15- o 



XI- 7 



S-4 



23.0 



16.7 



2.0 

 1.4 

 8.3 



4.0 



1-3 



18.5 



16.1 



5-9 



25.8 



3-4 



22.0 

 2-3 

 3-8 

 9.1 



3-3 



18.6 

 13-6 



S-7 

 24-6 



3-4 



The above fruit was held in cellar storage and a second examination 

 made on February 7. At this time the apples were cut open, and any 

 that had either browning of the vascular tissue or surface pitting were 

 counted as affected with bitter-pit. The results are given in Table VII, 

 the percentages being computed on the number of apples that were 

 free from bitter-pit at the time of the last note-taking. There was 

 little contrast in the amounts of disease on the different pickings, and 

 the three are considered together. 



Table VII. — Percentage of bitter-pit on Jonathan apples. February 7, igi6 



Plat 

 No. 



Irrigation treatment. 



Heavy 



Medium 



Light 



Medium, then heavy. . 

 Heavy, then very light 



Total 

 percent- 

 age for 

 season. 



24. 6 



14.7 

 8.8 



25.8 

 4-3 



