PEST MANAGEMENT: WEEDS Control Options for Acetolactate Synthase- Resistant Smallflower Umbrella Sedge in Arkansas Rice
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چکیده
Smallflower umbrella sedge is an increasingly problematic weed in direct-seeded rice in Arkansas. Recently, a sample collected from an Arkansas rice field was confirmed resistant to halosulfuron (Permit). Studies were conducted to determine the effectiveness of various acetolactate synthase (ALS)-inhibiting herbicides on control of the resistant biotype relative to a susceptible biotype and to evaluate alternative herbicide mechanisms of action for control of the resistant biotype. Control of the resistant biotype was <49% with a labeled rate of bispyribac-sodium (Regiment), halosulfuron, imazamox (Beyond), and penoxsulam (Grasp); whereas control of the susceptible biotype was >90% with these herbicides. Control of both biotypes was >96% with bentazon (Basagran) and propanil (Riceshot), but quinclorac (Facet), thiobencarb (Bolero), and 2,4-D (Weedar) were ineffective. Considering propanil-resistant smallflower umbrella sedge has been confirmed in California, it would be prudent to tank-mix bentazon and propanil to minimize further risk of resistance evolving to these herbicides in Arkansas rice.
منابع مشابه
Imidazolinone-tolerant crops: history, current status and future.
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