NDLI: Weed control in alfalfa (Medicago sativa L.) grown for seed

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Weed control in alfalfa (Medicago sativa L.) grown for seed

Content Provider	Semantic Scholar
Author	Stannard, Mark Edwin
Copyright Year	1987
Abstract	Hexazinone is a broad spectrum herbicide that was popular with the alfalfa (Medicago sativa L.) seed producers in Montana. Although hexazinone was a valuable herbicide, there were frequent reports of alfalfa injury from 1982 to 1984. Several factors were investigated to determine possible causes of injury. Three factors implicated in most cases were low soil organic matter, application of hexainone to nondormant alfalfa, and application of hexazinone to alfalfa which endures stress conditions later that growing season. Alfalfa seedlings are very sensitive to soil residues of chlorsulfuron. Approximately.20 million alfalfa seeds were sown into soil previously treated with 35 g ai/ha. chlorsulfuron. This mass selection technique produced 15 healthy alfalfa plants each representing a line. Each line was cloned and tested for tolerance to chlorsulfuron applied as a foliar spray and as a soil drench. Seven lines were tolerant to foliar application and six were tolerant to soil drench. Acetolactate synthase from two lines was more tolerant to chlorsulfuron than control lines. A weed survey was conducted in 36 and 23 certified alfalfa seed production fields in 1985 and 1986, respectively. Fifty-six and 35 weed species were identified in fields in 1985 and 1986, respectively. Eight of the 10 most frequently occurring weeds of 1985 were among the 10 most frequently occurring weeds of 1986. Chemical weed control was the most common method of weed control. Canada thistle ( Cirsium arvense L.) was perceived to be the most troublesome weed by producers. WEED CONTROL IN ALFALFA (Medlcago satIva L .) GROWN FOR SEED by Mark Edwin Stannard A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in
Starting Page	1
Ending Page	142
Page Count	142
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://scholarworks.montana.edu/xmlui/bitstream/handle/1/6475/31762100242559.pdf?isAllowed=y&sequence=1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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