Quackgrass [Agropyron repens(L.) Beauv.] was controlled by spring application of pronamide [3,5-dichloro(N-1,1-dimethyl-2-propynyl)benzamide] in 1970 and 1971, but when spring rainfall was below nornal in 1973, only pronamide applied the previous fall gave control. Terbacil (3-tert-butyl-5-chloro-6-methyluracil) gave 90% control of quackgrass for 2 yr at 2.2 kg/ha. Some control continued for 3 yr at 4.5 kg/ha. Three applications of glyphosate [N-(phosphonomethyl)glycine] at 3 kg/ha applied during a 2-yr period controlled quackgrass 97 to 100%. Phytotoxicity was not observed on 14-yr-old highbush blueberries(Vaccinium corymbosumL.) from pronamide or terbacil, on 4-yr-old blueberries from pronamide, or on 2-yr-old rhododendrons(Rhododendron× ‘A. Bedford’) from dichlobenil (2,6-dichlorobenzonitrile), pronamide, or directed sprays of glyphosate or amitrole (3-amino-s-triazole).
McFarlin cranberry vines, in a commercial bog, that showed leaf chlorosis similar to iron deficiency symptoms and lack of growth from terminal buds, were treated with foliar applications of ethylenediamine-tetraacetic acid chelated materials of Zn, Fe, and Mn and boric acid in April of each year for three consecutive years. Leaf analysis showed high levels of Fe, Mn and aluminum (Al) in the untreated vines. The vines responded primarily to Zn and Fe chelates and B treatments in 1977 with more growth from terminal buds and greater leaf color. Chelated Fe and Zn and boric acid treatments decreased foliar levels of Fe and Al in 1977 and Fe and Mn in 1979.Key words: Vaccinium macrocarpon Ait., minor element deficiency, minor element toxicity, Al toxicity, minor element interactions
Midsummer application of butanedioic acid mono-2,2-dimethylhydrazide (daminozide), 2500 ppm, or (2-chloroethyl)trimethylammonium chloride (chlormequat), 3000 ppm, with or without (2-chloroethyl)phosphonic acid (ethephon), 2000 ppm, were applied to highbush blueberry (Vaccinium corymbosum L.) ‘Stanley’ and ‘Bluecrop’. Flower bud set and flower number were increased by daminozide on both cultivars. ‘Stanley’ plants showed an increase in numbers of fruit per shoot and total yield. Ethephon generally did not interact with growth retardants, but evoked a response similar to daminozide in ‘Bluecrop’.
Terbacil (3-tert-butyl-5-chloro-6-methyluracil) was applied to highbush blueberry plants(Vaccinium corymbosumL. ‘Pemberton’, ‘Rancocas', ‘Jersey’, and ‘Concord’) growing in a Rifle peat, Camas clay loam, or Mossy Rock silt loam for control of quackgrass [Agropyron repens(L.) Beauv.]. Control was 80 to 100% from applications made in April after the blueberry plants broke dormancy. Higher dosages proved phytotoxic from these applications on Camas clay loam. Applications in February or March while the blueberry plants were still dormant caused no phytotoxicit; to the blueberry plants and provided 80 to 90% quackgrass control. Four consecutive yearly applications caused no residual buildup to the point of phytotoxicity to blueberry plants. Carry-over of terbacil in the soil from year to year did occur.
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