Efficacy of plant extracts for post-emergent painted spurge (Euphorbia heterophylla L.) control
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Abstract
Using plant extracts for weed control is one of the practical options for farmers to reduce the use of chemicals. The primary focus of this study is to determine the efficacy of plant extracts in post-emergent painted spurge management. The research encompasses experiments involving the identification of suitable weed species for effective painted spurge control and the evaluation of the impact of extracts from dried leaves of three distinct plant varieties, specifically siam weed, praxelis, and little ironweed, treated with 95% ethanol, in contrast to untreated controls. The study's results indicate that praxelis leaf extracts exhibited superior inhibition of painted spurge growth compared to untreated controls, as well as when compared to siam weed and little ironweed extracts. The subsequent experiment aimed to identify the optimal extract concentration from praxelis leaves for controlling painted spurge, utilizing three concentration levels: 100 %, 75 %, and 50 % with 95 % ethanol, in contrast to untreated controls. The findings revealed that using praxelis extracts at 100% concentration resulted in more effective painted spurge control, with noticeable growth inhibition in seedling trays and nursery bags, surpassing the untreated controls. Interestingly, there was no significant difference in growth inhibition between the 100 % and 75 % concentration extracts. Therefore, for effective painted spurge control, praxelis leaf extracts at a 75% concentration appear to be the preferred choice.
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