Abstract
Laboratory experiments to evaluate the combined effect of Chromolaena odorata (Co) and Phlogocanthus thyrsiflorus (Pt) against Oligonychus coffeae and Helopeltis theivora revealed that the methanolic leaf extracts at a combination of 75% LC50 Pt + 25% LC50 Co and 25% LC50 Pt + 75% LC50 Co were the most effective against O. coffeae and H. theivora, respectively. They recorded the highest co-toxicity coefficient and co-toxicity factor values of 206.53 and 63.34 and 398.40 and 100.00, respectively revealing potentiation and synergistic effects. A combination of 50% LC50 Pt + 50% LC50 Co can effectively manage both O. coffeae and H. theivora (76.67% and 100.00% adult mortality, respectively) with the highest co-toxicity coefficient and co-toxicity factors.
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