There are several of the dinitros wh:Lcl\ Iv.v,' been cleared and can be used 

 for the control of fall and winter weod^ in s trawbcvries but In i iassacnusetts 

 these are generally Icgs effectivi. than Chloro-IPJ. i.'hese materials are not 

 selective and act by killing the tops of plants. jjecause of this "burning" action, 

 they are much more effective on warm sunny days tiian on cold days. Li'-c JIPC, 

 they must be applied after the strax^7bL;rl■i■:3 become dormant. oince Virarin, sunny 

 days are not plentiful after mid-ijovember , the i.isefulucss of these nvt'rials is 

 limited. Since there arc several formuj.ati'jns of tliese materials, ii- is wise to 

 follow very closely the manufacturer's directions as to rate of application. 



Dacthal is the most recent materia] to be cleared for weed control in straw- 

 berries. Like Sesonc, it appears to be more effective when applied to a weed 

 free soil. In Ohio satisfactory results followed four applications made in a 

 single season at rates of 4 to 6 pounds active ingredient per acre. Summer 

 applications have some carry-over effect into the fall for controlling chickweed 

 and other fall weeds. Late October or early Jovember applications were found to 

 be very effective in controlling fall and winter weeds. During 1962 Dactlial 

 looked promising both in grower and experimental trials. 



Blueberries 



Diuron has been cleared for use as a weed killer in blueberries at the rate 

 of 2 pounds per acre. It is most effective when applied to a weed-free soil in 

 early spring. In no case should it be applied vrithin 60 days of harvest. Diuron 

 is quite effective against most annual broadleaf weeds and grasses but is much 

 less effective against the deep-rooted perennials. 



Chloro-IPC has also been cleared for use around cultivated blueberries up to 

 a total of 12 pounds per acre applied during the dormant season. Since this is 

 essentially a grass and chickweed killer and can be used only during the dormant 

 season, its usefulness is limited. 



2,^^-0 up to 3 pounds per acre has also been cleared for use on cultivated 

 blueberries but care should be e::ercised not to get it on the leaves of the 

 plants. Since its use is limited to fall application and it is effc^ctive only 

 against broadleaf weeds, its use in blueberries is also limited. 



Raspberries 



Only two materials have been cleared for we 'd control in raspberries in the 

 Northeast. 2,4-D can be used to control broadleaf weeds since mature canes are 

 quite resistant to it. However, care should be e::ercised to use a directed spray 

 and not to use it at a time when the grov/ing tins of the new canes will be sprayed. 

 It may be applied at the rate of 1 pound actual acid equivalent per acre. 



Chloro-IPC, as x</ith strawberries and blueberries, can be used as a dormant 

 application up to a total of 8 pounds per acre. 



