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- Author or Editor: Malcolm N. Dana x
- HortScience x
Abstract
Cranberries (Vactinium maerocarpon Ait), are Wisconsin's major fruit crop. Current annual production averages well over 45 million kg, and on-farm value exceeded $53 million in 1983. Wisconsin produced 40% of the United States cranberry crop in 1982; Massachusetts contributed 43%, and Oregon, Washington, and New Jersey produced 17%.
Abstract
Cranberry flower development was studied in the greenhouse on uprights thinned to a single flower. Flowers started opening each hour of the day. The interval from petal separation to fully open flowers varied from 2 to 12 hr with 80% of the flowers fully open within 6 hr. Elongation of the style and emergence of the stigma through the anther ring occurred on 94% of the flowers during the 24 - 48 hr period after the petals were fully reflexed. The stigma was pollen receptive at the time of petal separation. The pollen tube had traversed the style 48 hr after pollination in 37% of the flowers examined. Removal of the style 72 hr after pollination no longer prevented fruit development.
Abstract
Partial or complete removal of developing inflorescences from primocanes of ‘Heritage’ fall-bearing red raspberry had no effect on the number of inflorescences initiated. Inflorescence removal stimulated sucker initiation and increased fruit size.
Abstract
Low temperature was not a requirement for flowering in ‘Heritage’, a primocane-fruiting red raspberry, as non-cold treated primocanes flowered at about 80 nodes. The amount of growth before flowering was inversely related to the amount of growth before cold exposure. Cold exposure (7°C) for 25 days at the 10-12 or 14-16 nodes stages of growth was followed by flowering at 32 and 28 nodes, respectively. Winter cold exposure until mid-December at the stage of adventitious buds on the root resulted in flowering at 41 nodes. Cold treatment did not influence the number of nodes that developed inflorescences on any one primocane.
Abstract
Cuscuta spp. (dodder) are phanerogamic holoparasites. Swamp dodder (C. gronovii Willd. ex R. & S.) is a problem weed in cranberry (Vaccinium macrocarpon Ait.) in Wisconsin and Massachusetts, causing yield losses as high as 80% to 100% (Devlin and Deubert, 1980). At rates used in cranberry, the registered herbicides, granular chlorpropham (1-methylethyl 3-chlorophenylcarba-mate) and granular dichlobenil (2,6-dichlorobenzonitrile), are not totally effective, causing a steady increase in swamp dodder infestation. Since chlorpropham use was discontinued in 1988, dichlobenil is the only registered herbicide for dodder control in cranberry. The objective of this research was to investigate preemergence herbicides for swamp dodder control in cranberry.