Determining Spanish needle (Bidens alba) sensistivity to foliar and soil applied herbicides


University of Florida

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Southeast (GA, FL, AL)

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Spanish needle has been a common pasture and natural area weed for decades. However, in the past 4-5 years this weed has been observed to invade peanut production fields. The principle reason for invasion is likely the use of imazapic and the PPO herbicides (Ultra Blazer and Cobra). In research conducted to control Spanish needed on highway rights-of-ways, we have repeatedly shown that imazapic and saflufenacil (a PPO herbicide) are largely ineffective on this plant. By using imazapic and the PPO herbicides to control a wide variety of common peanut weeds, we have inadvertently released Spanish needle to grow and reproduce at peak capacity. 
Recent attempts to conduct field trials on this weed were unsuccessful since this plant appears to germinate and emerge over a long period of time. Additionally, the field site was moldboard plowed prior to the experiment and the Spanish needle stand was inconsistent due to the uneven burial of the seed. In order to get an understanding of germination and emergence profiles, we began with a greenhouse experiment to test germination and emergence. 

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