34 



UNIV. OF N. H. AGR. EXPERIMENT STATION 



[Bulletin 221 



Spraying experiments were continued on the control of scab on Mcin- 

 tosh and Baldwin apples for the purpose of obtaining added information 

 on the relative value of Bordeaux mixture and lime-sulphur solution. 

 The results obtained on Mcintosh are given in Table XXI. 



Table XXI — Relative value of Bordeaux mixture and lim^-sulphur solution for the control 



of scab 



It will be noticed that the sprays containing Bordeaux mixture gave 

 better scab control than the schedule in which lime-sulphur solution only 

 was used — results which are in harmony with data previously obtained. 

 If a choice had to be made, therefore, on the basis of scab control one 

 would choose a spray schedule using Bordeaux mixture; but, in practice, 

 one must give consideration to the eifect of the spray used on the appear- 

 ance of the fruit. Bordeaux mixture, even when applied only at the pre- 

 pink and pink sprayings, russeted the fruit quite badly, while, when 

 lime-sulphur solution was used throughout, the russet was very incon- 

 spicuous and did not materially destroy the bloom of the fruit. These 

 results also are in accord with previous experiments.* 



The experiments on Baldwin showed that lime-sulphur solution could 

 satisfactorily replace Bordeaux mixture, and that under light scab infec- 

 tion a pre-pink and calyx spray, or a pink and calyx spra}^ would give 

 adequate control. . 



Control of Sooty Mould 



Sooty mould did not develop during the season, and the spray schedules 

 ordinarily used for scab produced clean fruit. 



Control of Bitter Pit {State Fund) 



Experiments were begun by Dr. Butler for the purpose of studying the 

 effect of fertilization on the development of bitter-pit, but no marked 

 results were obtained from any of the treatments. 



Bean Anthracnose ^ 



It is generally considered that anthracnose is freely spread when beans 

 are worked while the plants are wet. We have not found this the case, 

 however. Diseased bean seed was planted by L. J. Klotz at each end of 

 two rows of clean seed. One row was very thoroughly and systematically 



* The arsenical used was calcium arsenate, 

 tion causes more or less severe russeting. 



Arsenate of lead in the lime-sulphur solu- 



