-6- 



Since raspberries are quite tolerant of 2,4-D, it can be used at 1/2 - 1 



pound per acre in 20 - 40 gals, of water for the control of broad- leaved weeds. 



To avoid injury to the raspberries; (1) delay spraying till the tend<?r tips of 



shoots are high enough so they viill not be sprayed, (2) do not spray during bloom. 



Chloro IPC at 4 - 8 pounds per acre in 20 gals, of water can be used in late 

 fall or early winter for control of winter annual grasses and broad- leaved weeds, 

 particularly chickweed. 



Grapes 



An oil-water emulsion of Chloro IPC and DN used as a directed spray at 30 

 gals, per acre has given good weed control. It is made up as follows: 



Chloro IPC 6-8 lbs. 

 Oil soluble DN (Dow General or 



Sinox General) 1 lb. 



Oil (fuel or diesel) 10 gals. 



Water 40 gals. 



This emulsion can be sprayed in a band 18 - 24 inches wide on each side of the 

 trellis. Care should be exercised not to get the spray on young canes which have 

 not yet reached the shedded bark stage. 



Diuron applied pre-emergence in early spring is also effective. Use only 

 on vines 3 years of age or older. Two to 3 pounds per acre is sufficient on 

 sandy soils. On clay soils use 3-6 pounds per acre. 



WARNING: Grapes are extremely sensitive to phenoxy compounds such as 2,4-D, 

 2,4,5-T, silvex, MCPA and others. Do not use these on or near grapes nor use 

 spray equipment which has held these materials for spraying grapes. 



—-John S, Bailey 



I I I I I I I I I I I I I I I I 



BLUEBERRY MAGGOT 



In the past few seasons there has been considerable trouble in some of the 

 older, larger blueberry plantings in Southeastern Massachusetts from blueberry 

 maggot infestations. The surprising thing about these infestations is that they 

 didn't happen sooner and oftener in the area. Possibly infestations did occur 

 and were overlooked or ignored. 



This is a native insect that has been known as a pest of wild blueberries 

 for many years. It has also been troublesome in cultivated blueberries in New 

 Jersey and Michigan for many years. For that reason I am confident it has been 

 infesting Massachusetts cultivated blueberries for some time. 



Blueberry maggot is indistinguishable from apple maggot in all stages. The 

 flies developing from the smaller wild blueberries are considerably smaller than 

 flies that develop in apples, but flies from the larger cultivated blueberries 

 are about as large as those developing in apples. The two strains apparently 

 prefer their own host for purposes of oviposition, but they have been intermated 



