Common cocklebur (Xanthium strumarium) resistance to selected ALS-inhibiting herbicides

Five biotypes of common cocklebur that were not controlled with acetolactate synthase (ALS)-inhibiting herbicides were tested in greenhouse and laboratory studies to determine the magnitude of resistance and cross-resistance to four ALS-inhibiting herbicides. In vivo inhibition of ALS was also evalu...

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Bibliographic Details
Published in:Weed technology 1997-04, Vol.11 (2), p.241-247
Main Authors: Sprague, C.L, Stoller, E.W, Wax, L.M
Format: Article
Language:English
Subjects:
ACETOLACTATE SYNTHASE
ACTIVIDAD ENZIMATICA
ACTIVITE ENZYMATIQUE
Biological and medical sciences
BIOTIPOS
BIOTYPE
BIOTYPES
Chemical control
CHLORIMURON
CLORIMURON
CROSS RESISTANCE
Enzymes
ENZYMIC ACTIVITY
Fundamental and applied biological sciences. Psychology
HERBICIDAS
HERBICIDE
Herbicide resistance
Herbicide resistant weeds
HERBICIDES
IMAZAQUIN
IMAZETHAPYR
IMIDAZOLINONE HERBICIDES
LIASAS
LYASE
LYASES
MALEZAS
MAUVAISE HERBE
NAF-75
Parasitic plants. Weeds
Phytopathology. Animal pests. Plant and forest protection
Phytotoxicity
Plants
Ratios
RESISTANCE AUX PRODUITS CHIMIQUES
RESISTANCE TO CHEMICALS
RESISTENCIA A PRODUCTOS QUIMICOS
Seeds
Soybeans
SULFONYLUREA HERBICIDES
TRIAZOLOPYRIMIDINE SULFONANILIDE HERBICIDES
WEEDS
XANTHIUM
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Summary:Five biotypes of common cocklebur that were not controlled with acetolactate synthase (ALS)-inhibiting herbicides were tested in greenhouse and laboratory studies to determine the magnitude of resistance and cross-resistance to four ALS-inhibiting herbicides. In vivo inhibition of ALS was also evaluated. Based on phytotoxicity, all five ALS-resistant biotypes of common cocklebur were > 390 times more resistant than the susceptible biotype to imazethapyr. However, only four of these biotypes were also resistant to another imidazolinone, imazaquin. Two biotypes were cross-resistant to the sulfonylurea, chlorimuron, and the triazolopyrimidine sulfonanilide, NAF-75. One biotype demonstrated intermediate susceptibility to imazaquin, chlorimuron, and NAF-75. In all cases, the resistance exhibited at the whole plant level was associated with an insensitive ALS.
ISSN:0890-037X
1550-2740
DOI:10.1017/S0890037X00042901