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  • Author or Editor: Leonard B. Hertz x
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Abstract

‘Trumpeter’ strawberry (Fragaria × ananassa Duch.) plants growing under clear polyethylene (PE) as a winter mulch grew and flowered earliest but yielded less than other treatments in 2 of 3 years. Sudangrass straw (Sorghum sudanense (Piper) Staph) under clear PE reduced fruit size and yield, whereas sudangrass straw on top of clear PE increased fruit yield. The yield and size of fruit from plants which had not received mulch was equal to that of the standard mulch, sudangrass, in 2 of 3 years. Black PE was nearly as effective a mulch as sudangrass straw.

Open Access

Abstract

Several herbidices were evaluated over a 2-year period as early and late postemergence teratments applied to low-statured blueberry plants (Vaccinium angustifolium × V. corymbosum L.) growing in a low-organic matter soil in northern Minnesota. Good to excellent control of quackgrass (Agropyron repens (L.) Beauv.) was obtained with both terbacil [3-tert-butyl-5-chloro-6-methyluracil] and glyphosate [N-(phosphonomethyl)glycine]. The annual broadleaf weed complex was effectively controlled by simazine [2-chloro4,6-bis(ethylamino)-s-triazine] and terbacil. Glyphosate controlled quackgrass the most consistently. Terbacil, through root absorption, and glyphosate and paraquat [1,1’-dimethyl-4,4’-bipyridinium ion], by foliage contact, injured the blueberry plant.

Open Access

Abstract

Emerging primocanes of red raspberry, Rubus ideaus L. ‘Boyne’, were sprayed with naphthaleneacetic acid (NAA) at concentrations of 0.5, 1.0, and 1.5% when shoots were 7–13-cm-tall or at 1.0 and 2.0% when they were 13–20-cm-tall. Treated primocanes exhibited leaf cupping and epinasty followed by withering and death. Untreated floricanes and primocanes emerging after treatment were normal. Treatment with NAA at all rates restricted the height of primocanes emerging after treatment. Fruit yield the year following was reduced by NAA applied to shoots 13-20-cm-tall.

Open Access