Cyperus iris

During a recent field visit to a farmer’s plot, we observed significant damage to the rice fields caused by Cyperus iris L., locally referred to as “Thulo Mothe Jhar.” Through interviews with the farmers, it became evident that their attempts to control this weed using herbicides had proven ineffective. This issue is exacerbated by the growing problem of weed species developing resistance to herbicides, making their management increasingly challenging. As a result, it is evident that implementing crop rotation is essential.


It’s worth noting that herbicides show limited efficacy against Cyperus due to its inherent resistance. The main complicating factor is the weed’s ability to generate numerous underground tubers. Although the species is not well-suited to shade, a potential approach to mitigating its growth is to cultivate tall, rapidly growing crops like maize, which could slow down its expansion. However, it’s important to acknowledge that even this strategy might not achieve complete eradication.


Given the complexity of the issue, a multi-faceted approach is necessary to address the challenge posed by Cyperus iris L. Simply relying on a single method, such as herbicide application or shade-inducing crops, is unlikely to yield a satisfactory outcome. Instead, a combination of various strategies will be needed to effectively manage this persistent weed problem.