EXPERIMENT STATION BULLETINS. 439 



Less satisfactory control of codling moth was obtained on the dusted trees 

 in spite of the extra application to this plot made in August. The skin of 

 the apple becomes quite waxy when nearly ripe and the dust apparently does 

 not adhere well to the fruit at this period of development. 



Effect on the foliage. There was no pronounced difference at the end of 

 the season in the physical condition of the foliage of the dusted and sprayed 

 plots, but earlier in the season the foliage of the dusted trees was somewhat 

 better. 



EXPERIMENT AT TRAVERSE CITY. 



Another experiment was conducted at Traverse City on the farm of C. F. 

 & J. W. Stickney. This farm is on the Old Mission (Grand Traverse) Penin- 

 sula. It lies in a narrow strip of land bordered on one side by the waters of 

 Bower's Harbor and on the other by a high and abrupt hill. Along the front 

 of the farm, next to the water, there is a grove of tall pine trees. These trees, 

 on one side and the hill on the other, form a natural draw through which there 

 were frequently strong air currents, even when there was no general wind 

 on adjacent farms. This condition probably had a definite effect upon the 

 results and will be discussed later. 



The orchard is made up of young bearing trees of several varieties. They 

 are Wealthy, Wagener, Winter Banana, Ontario, Jonathan, Walker's Beauty, 

 Delicious, Sutton, Rome Beauty, and others. Most of the varieties were 

 planted with one or two rows of a variety with Wagener as fillers. 



Materials and Applications. The entire orchard was dusted with sulphur 

 except for four cross-rows (two at the north end and two at the south end) 

 which were left as checks. The dusting was done with a large power duster 

 but the applications were made under conditions that were not always ideal, 

 and that did not always permit uniform and satisfactory application of the 

 dusting materials. Atmospheric conditions were frequently unsatisfactory. 



Seven applications were made at the periods and with the materials as 

 given below : 



1st. April 29. "Pre-pink" apphcation. Sulphur with 10 per cent of 

 hydrated lime as a spreader. 



2nd. May 4. Pink or cluster application. 80-10-10* mixture. 



3rd. May 24. Calyx apphcation. 80-10-10* mixture. 



4th. June 8. Two weeks apphcation. 80-10-10* mixture. 



5th. July 8. For scab. Sulphur with 10 per cent lime. 



6th. July 22. Second brood codling moth. 80-10-10* mixture. 



7th. Aug. 19. For codling moth and scab. 90-lOt mixture. 



Weather conditions. Conditions were favorable very early in the season 

 for scab development but were not so from the blooming period until early 

 in July. The first rain of consequence, during the summer, fell on July 7. 

 There was some evidence of scab which had developed earlier in the season 

 and because the conditions were favorable to scab development, the appli- 

 cation of sulphur was made on July 8. After that time there were other 

 periods favorable for scab development, particularly in an orchard close to 

 the lake. 



*80 per cent sulphur, 10 per cent hydrated hme, 10 per cent arsenate of lead. 

 t90 per cent sulphur, 10 per cent arsenate of lead. 



