You are looking at 1 - 4 of 4 items for
- Author or Editor: Robert M. Devlin x
2-Chloro-2, ‘6’-diethyl-N-(methoxymethyl)acetanilide (alachlor), 4-chloro-5-(dimethylamino)-2-(α,α,α-trifluro-m-tolyl)-3 (2H) pyridazinone (SAN-6706), and 4-chloro-5-(methylamino)-2-(α,α,α-trifluoro-m-tolyl)-3(2H)-pyridazinone (SAN-9789) were applied to ‘Early Black’ cranberry vines in the spring at rates of 8, 12, and 16 lb. active ingredient/acre. No phytotoxicity on vine growth or appearance was detected in the alachlor plots or in plots receiving lower rates (8 and 12 lb./acre) of SAN-6706 and SAN-9789 but the higher rate caused a temporary chlorosis at the base of the cranberry leaf blade. No significant differences were detected between untreated and treated berries in respect to yield and berry size, dry wt, pectin content, and anthocyanin development.
The experimental herbicide 2-(naphthoxy-N,N-diethylpropionamide (R-7465) was compared with Morcran [a formulated mixture of sodium N-1-naphtylphthalamate (naptalam) and isopropyl m-chlorocarbanilate (chlorpropham)] and dichlorobenzonitrile (dichlobenil) on fruit development of cranberry (Vaccinium macrocarpon cv. Early Black). R-7465 had no significant influence on yield, berry size, berry dry weight, pectin content, or anthocyanin development.
The germination of non-dormant (light treated) seeds of cranberry, (Vaccinium macrocarpon Ait. cv. Early Black) is inhibited by exogenous abscisic acid (ABA). Mechanical scarification enhances this inhibitory influence, almost complete inhibition occurring at 100 ppm ABA. Extracts of dormant seeds also inhibited germination whereas extracts of nondormant seeds did not. Gas-liquid chromatographic analyses indicate the presence of much higher amounts of ABA in the extracts of dormant seeds compared to non-dormant seeds. These observations suggest that ABA may be a controlling factor in cranberry seed dormancy.
The purpose of this study was to test the effect of malathion and IAA on color development in the cultivated cranberry, Vaccinium macrocarpon var. ‘Early Black’. Dosage and time of application were evaluated. Quantitative analyses for antho-cyanins of berries fresh-frozen at harvest showed that applications of 800, 1600, 2400 ppm malathion all caused a highly significant increase in color. Applications of IAA at 30 and 50 ppm did not affect color development. Treated and untreated berries were also analyzed for anthocyanin development after 7 and 14 days in common storage. No significant differences in size or yield were observed between treated and untreated berries. It was concluded that malathion applied 2 weeks before harvest at 1600 ppm would give good color enhancement and still be within the label restrictions for the use of this material on cranberries.