Differences in sensitivity of F1 and F2 generations of herbicide tolerant sunflower volunteers to selected acetolactate synthase inhibiting herbicides

https://doi.org/10.17221/185/2014-PSECitation:Jursík M., Hamouzová K., Soukup J., Andr J., Holec J. (2014): Differences in sensitivity of F1 and F2 generations of herbicide tolerant sunflower volunteers to selected acetolactate synthase inhibiting herbicides. Plant Soil Environ., 60: 446-451.
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The aim of this work is to describe the differences in sensitivity of Clearfield, ExpressSun and non-herbicide tolerant (HT) sunflower cultivars to several acetolactate synthase inhibitor herbicides and to find out the differences in sensitivity in F1 and F2 generations of these cultivars. Non-HT sunflower was very sensitive to most of the tested herbicides, except for nicosulfuron (efficacy 43–75%). F2 generation of non-HT sunflower showed a low level of sensitivity to imazamox (efficacy 10–43%) and to nicosulfuron, tribenuron, thifensulfuron and rimsulfuron under dry conditions (efficacy 43–83%). Sensitivity of Clearfield sunflower (cultivar with tolerance to imidazolinone herbicides) to tested sulfonylurea varied according to used herbicide and weather conditions. The highest efficacy on Clearfield sunflower showed iodosulfuron (97–100%) > florasulam (88–100%) > foramsulfuron (40–98%) > thifensulfuron (12–99%) > rimsulfuron (37–99%) > tribenuron (0–87%) > nicosulfuron (0–78%). ExpressSun sunflower (cultivar with tolerance to tribenuron) was the most tolerant to all tested herbicides. The lowest efficacy on F1 generation showed tribenuron (0%) > imazamox (0–17%) > nicosulfuron (0–43%) > thifensulfuron (0–57%) > rimsulfuron (0–70%) > foramsulfuron (8–75%) > florasulam (75–96%) > iodosulfuron (87–98%). Sensitivity of F2 generation of ExpressSun to tested herbicide was usually higher as compared to F1 generation.
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