. Cranberries; : the national cranberry magazine. Cranberries. Jersey grower, has had exactly ;he opposite experience. He â¢eports that, after sanding, jrowth was good at one site the irst year. However, the second r^ear after sanding, there was leavy dieback. Attempts at â eplanting have had generally )oor results. [I. PATCH DIEBACK IN APRIL/WINTERDIEBACK \. Symptoms: This form of dieback has been ippearing throughout Massachu- letts for the past three years and ilso occurs in Washington and Dregon. It appears in dry-picked )ogs soon after the water is Irawn off the vines, in April, rhe vines
. Cranberries; : the national cranberry magazine. Cranberries. Jersey grower, has had exactly ;he opposite experience. He â¢eports that, after sanding, jrowth was good at one site the irst year. However, the second r^ear after sanding, there was leavy dieback. Attempts at â eplanting have had generally )oor results. [I. PATCH DIEBACK IN APRIL/WINTERDIEBACK \. Symptoms: This form of dieback has been ippearing throughout Massachu- letts for the past three years and ilso occurs in Washington and Dregon. It appears in dry-picked )ogs soon after the water is Irawn off the vines, in April, rhe vines go bronze, then die ;ompletely. There's a wholesale stripping of epidermal root cells ind stripping of feeder roots. 3. Cause: Prank Caruso of the Univer- iity of Massachusetts Cranberry i)xperiment Station reports that itrawberry root weevils and )lack vine weevils appear to be he major causes of April patch iieback. Black vine weevils ippear only in bogs that were lot winter flooded, while straw- »erry root weevils appear in looded as well as unflooded bogs. Joth insects have been observed n the same bog. It is hypothe- ized that the residue of Diel- irin®, which was sprayed in the L970's and which was used to ;ontrol root grubs, is wearing i,ff. 1^ Chemical Control: For larvae in April, no chemi- al has been found yet for use in lassachusetts, but Furadan is egistered for use on the West bast. For adults in July and lugust, Lorsban, Guthion and ih-thene are possibly effective. I'arathion is not effective. i). Biological Control: I Nematodes are a potential bio- igical control at the larval stage. !. Environmental Control: Winter flooding should provide introl against black vine wee- vil. Flooding after dry picking may help control both strawberry root weevil and black vine weevil. Late drawing off of water may be a useful control. Sanding may or may not help. Ill FAIRY RING DIEBACK A. Symptoms: Distinct rings of dead and dying vines occur. Fairy rings begin as smal
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