the trunk of each peach tree in the test. In the apple orchard, 

 the herbicides were applied to a circular area 8 feet in diameter 

 on grassy areas between the trees. The concentrations used are 

 indicated in Table 1. Single-tree plots were used and each treat- 

 ment was replicated 10 times in each orchard. 



RESULTS AND DISCUSSION 



The fall applications of G dichlobenil provided outstanding 

 weed control from May into October in 2 of the 3 orchards, whereas 

 fall applications of G simazine failed to provide acceptable weed 

 control at any location (Table 1). 



Table 1. Effectiveness of fall applications of granular simazine 

 and granular dichlobenil for the control of weeds in the 

 orchards . 



Percent weed control , 1966 



Treatment 



Acushnet 



Amherst 



Bel chertown 



6/28 9/7 10/6 6/13 9/8 10/6 6/13 9/8 10/6 



Simazi ne 



Early Nov. 44 38 25 



Mid-Nov. 47 29 28 



Dichlobenil 



Early Nov. 95 93 90 



Mid-Nov. 97 91 87 



G simazine and G dichlobenil applied at 3.2 lb ai/A and 8.0 lb 

 ai/A, respectively. Dates of application 11/1/65 and 11/15/65 at 

 Amherst and Belchertown; at Acushnet 11/4/65 and 11/19/65. 



Analysis of variance of the data in Table 1 showed that in 

 June the percentage weed control from the late application of herbi 

 cides at the 3 locations was significantly better than that from 

 the earlier application. By September, however, this influence of 

 timing was no longer apparent. 



The interaction of location and material was significant on 

 each of the 3 observation dates. At all locations in June, weed 

 control from dichlobenil was significantly better than from sima- 

 zine. The percentage weed control Kith simazine at Acushnet in 

 June was significantly less than at Amherst and Belchertown. In 

 September and October, weed control with dichlobenil was signifi- 

 cantly less at Belchertown than at Amherst and Acushnet and the 

 effectiveness of simazine and dichlobenil at Belchertown did not 

 differ significantly. Weed control with dichlobenil was signifi- 

 cantly better than with simazine at Acushnet and Amherst in Septem- 

 ber and October, however. 



