บทคัดย่องานวิจัย

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Weed survey of spring cereals in New Brunswick.

Thomas, A. G., Doohan, D. J. and McCully, K. V.

Phytoprotection Year: 1994 Vol: 75 Issue: 3 Pages: 113-124 Ref: 21 ref.

1994

บทคัดย่อ

Weed survey of spring cereals in New Brunswick.

ABSTRACT :

 

During 1986 and 1987, a weed survey of 187 New Brunswick cereal fields was conducted. A total of 76 species were identified, of which 40 were considered agronomically important. About 50% of the species were perennial. Hemp-nettle (Galeopsis tetrahit), quack grass (Agropyron repens [Elymus repens]), sheep sorrel (Rumex acetosella), ox-eye daisy (Chrysanthemum leucanthemum [Leucanthemum vulgare]), corn spury (Spergula arvensis) and chickweed (Stellaria media) had the highest relative abundance values. Quack grass and hemp-nettle had the highest densities at 8.0 and 7.1 plants m-2, respectively. The highest weed density (103 plants m-2) was found in oats (Avena sativa) grown after a forage crop. The lowest density (24 plants m-2) was found in wheat (Triticum aestivum) grown after potatoes (Solanum tuberosum). Most of the abundant species were tolerant to MCPA, the most commonly used herbicide. It was concluded that farmers could make major improvements in cereal weed control by choosing a herbicid

e that would control species tolerant to MCPA or 2,4-D, and using preplant or postharvest weed control to minimize the impact of perennial weeds.