Evaluation of Autotoxic Potential of Johnsongrass and Its Integrated Application with Herbicides

Ayşe Yazlik, İlhan Uremis


Johnsongrass (Sorghum halepense (L.) Pers.) is one among the worst weeds of the world which have evolved resistance against herbicides. The autotoxic potential of Johnsongrass can be used for its control. In this study, the different concentrations (2% and 4%) of Johnsongrass water extract (JGWE) were applied, alone or in combination with lower doses of foramsulfuron and clethodim, as post-emergence spray. A non-treated control was maintained for comparison. Data on plant height, fresh weight and dry weight of Johnsongrass were recorded on 30 days after spray. Fresh weight, dry weight and plant height of Johnsongrass were decreased significantly (37-46%, 46-60% and 30-39%, respectively) as compared to non-treated control after the application of JGWE (2 and 4%). A statistically similar control was noted for half doses of herbicides (foramsulfuron and clethodim) or a combination of herbicides + JGWE. These results conclude that allelopathic (autotoxic) potential of JGWE to suppress the Johnsongrass plants, however, their combination with herbicides could not significantly improve the control of Johnsongrass compared with individual use of these JGWEs.


Allelopathy; Autotoxicity; Herbicides; Weed control; Plant extracts

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