Investigation of the possibility of reducing dose of 2,4-D and tribenuron methyl herbicides in the control of hoary cress (Cardaria draba L. Desv) ecotypes

Article Type:
Research/Original Article (بدون رتبه معتبر)

In order to evaluate the efficacy of 2,4-D and tribenuronemethyl herbicides on ecotypes of hoary cress (Cardaria draba L. Desv) and the possibility of reducing the recommended dose, the dose-response experiment was performed as a randomized complete block with three replications in Ghaem Park greenhouse, Tehran in 2020. The studied ecotypes were Salmas, Rafsanjan, Semirom, Shahrekord, Baft, Birjand, Semnan and Karaj and the two herbicides were used in four doses (25, 50, 75 and 100% of the recommended dose) in the 4 to 6 leaf stage. The results showed that 2,4-D was more effective in controlling hoary cress ecotypes than tribrenuronethyl. By applying 100% of the recommended dose of 2,4-D, the dry weight of hoary cress ecotypes decreased by 91-99%. The dose of ED50 in response to 2,4-D and tribenuronemethyl for hoary cress ecotypes ranged from 0.41 to 0.89 lit hec-1 and from 8.5 to 17.27 g hec-1, respectively. Based on the estimated ED50 dose, the most sensitive and resistant ecotypes of hoary cress to both herbicides were Semirom and Karaj, respectively. Due to the 90% reduction in dry weight of Semirom, Baft, Shahrekord and Rafsanjan in 75% of the recommended dose of 2,4-D, the dose required to control these ecotypes can be reduced and less herbicide used.

Journal of Plant Production Science, Volume:11 Issue: 2, 2022
44 to 58  
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