52 EXPERIMENT STATION RECORD. 



This experiment was not satisfactoiy for several reasons, and a 

 second and more extended one was undertaken. Two-thirds of an 

 acre was divided into 2 equal parts, one of which Avas planted to Greg'g 

 and the other to Cuthbert raspberries. Each of these plats was further 

 subdivided into 3 plats. 



"Each of these 3 plats was again subdivided into 3 smaller plats, containing 3 

 rows each. Each of these 3-row plats had 1 row that was left unpinched, 1 row 

 of which the shoots only were pinched, and 1 row in which both the shoots and 

 laterals were pinched. In the first plat of each variety, the shoots in the pinched 

 rows were pinched at 12 in. high; in the second plat they were pinched at 18 in. 

 high; and in the third plat at 24 in. high. Four shoots only were permitted to 

 grow to each plant. The plantation was carefully gone over at frequent intervals 

 and every shoot in the pinched rows was pinched at nearly the designated height. 

 The superfluous shoots and suckers were removed from each row and either counted 

 or weighed. ' ' 



The results of the experiment indicated: "(1) That the high-pinched 

 rows A^elded more fruit than the low-pinched rows; (2) that the high- 

 pinched rows yielded more fruit than the rows that were not pinched; 

 (3) that twice pinching gave no advantage in ^deld over once pinching; 

 (■1) that the influence of the pinching is quite as marked in the Cuth- 

 bert variet}^ as in the Gregg, and it seems to have been exerted in the 

 same direction." 



Observations were made on the effect of pinching on growth of 

 superfluous shoots and suckers. The results are shown in tabular 

 form. 



"The data clearly indicate that pinching the shoots stimulates the growth of 

 superfluous shoots and suckers. Pinching both the shoots and laterals api^ears to 

 stimulate the superfluous growth less than pinching the shoots only. This is prob- 

 ably because the second pinching, coming later in the season than the first, and 

 being made on a larger number of shoots, is a much more effectual check to growth 

 than is the first pinching. ' ' 



Observations were also made on the effect of pinching upon the 

 height and stockiness of the stems and upon the labor of covering 

 them for winter. As a result of these experiments the author is of 

 the opinion that the importance of pinching as a means of keeping 

 the growth of stems within bounds has probably been overestimated. 



In the experiments there was but little difference as regards height 

 of canes and spread of branches between the plants pinched and those 

 unpinched; but the labor of covering the former was full}" one-third 

 greater. The stems were decidedl}' more brittle and the branches 

 were more numerous in the pinched rows. 



The experiments are to Ije continued. The following conclusions 

 are drawn from the data obtained up to the present time: 



"In young plantations of the Gregg and Cuthbert raspberries grown under the 

 conditions noted for these experiments, pinching the shoots high, (. e., when about 

 2-4 in. tall, is beneficial to the yield, but that pinching at 12 in. high is of very doubt- 



