Editorial Type:
Article Category: Research Article
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Online Publication Date: 01 Jun 1994

Preemergence Herbicide Evaluations on Selected Spring and Summer Flowering Bulbs and Perennials

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Page Range: 80 – 82
DOI: 10.24266/0738-2898-12.2.80
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Abstract

Nine species of field-grown flowering bulbs and perennials were screened for tolerance to the preemergence herbicide products Dacthal (DCPA), Gallery (isoxaben), Pennant (metolachlor), PRE-M (pendimethalin), Stakeout (dithiopyr), Derby (metolachlor + simazine) and Snapshot (isoxaben + oryzalin). Herbicides were applied at recommended rates three to five times over two to three years. No detrimental effects on growth, development or flowering were observed. Most products controlled large crabgrass, horseweed and prostrate spurge. However, control of crabgrass and spurge was poor with Gallery at 0.84 kg ai/ha, and control of horseweed and spurge was poor with Dacthal.

Keywords: herbicide tolerance; ornamental plants; weed control; weed management; Dacthal (DCPA), dimethyl 2,3,5,6-tetrachloro-1,4-benzenedicarboxylate; Gallery (isoxaben), N-[3-(1-ethyl-1-methylpropyl)-5-isoxazolyl]-2,6-dimethoxybenzamide; Pennant (metolachlor), 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide; PRE-M (pendimethalin), N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine; Stakeout (dithiopyr), S,S-dimethyl 2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3,5-pyridinedicarbothioate; Derby (metolachlor) + (simazine), 6-chloro-N,N'-diethyl-1,3,5-triazine-2,4-diamine; Snapshot (isoxaben) + (oryzalin), 4-(dipropylamino)-3,5-dinitrobenzenesulfonamide.; Spring flowering: Drumsticks (Allium sphaerocephalon L.); Daffodil (Narcissus L. x ‘Ice Follies’); Star of Bethlehem (Ornithogalum umbellatum L.); Summer flowering: Indian Shot (Canna L. x ‘Firebird’); Falling Stars (Crocosmia x crocosmiiflora (Lemoine ex Burbidge & Dean) N. E. Brown3 ‘Lucifer’); Daylily (Hemerocallis L. x ‘Pink Charm’); German Iris (Iris x germanica L. ‘Matinata’); Sterling Star Asiatic Hybrid Lily (Lilium L. x ‘Sterling Star’); Sarah Bernhardt Peony (Paeonia L. x ‘Sarah Bernhardt’); horseweed (Conyza canadensis (L.) Cronq.); large crabgrass (Digitaria sanguinalis (L.) Scop.); prostrate spurge (Euphorbia humistrata Engelm. ex Gray)
Copyright: Copyright, All Rights Reserved 1994

Contributor Notes

2Professor, Research Assistant, Professor and Research Assistant, Department of Horticultural Science.

3Hortus Third (1976) cited the authority as (V. Lemoine ex E. Morr.) N.E. Brown. P.J. Kostelijk (1984) corrected it in Crocosmia in gardens. The Plantsman 5:246–253.

Received: 22 Nov 1993
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