Biological control of weeds has achieved many successes worldwide, with 41 weeds successfully controlled using introduced insects and pathogens, and three more controlled using native fungi as mycoherbicides. These successes have been repeated in various countries and continents, saving millions of dollars and proving to be cost-effective despite high initial costs. However, biological control is not widely recognized due to factors such as poorly resourced programs, long time lags, and failure to remember past infestations. Biocontrol scientists must publicize their successes to highlight the method's effectiveness and sustainability. Many weeds have been successfully controlled, including tansy ragwort in the USA, nodding thistle in Canada and the USA, and Chromolaena odorata in the Marianas and northern Sumatra. The control of water hyacinth and salvinia has been particularly successful, with significant economic and social benefits. For example, the control of salvinia in Sri Lanka had a benefit-to-cost ratio of 1675:1. Despite these successes, many people still believe biological control has seldom worked, often due to forgetting past successes or not realizing the benefits. The success rate of biological control is often misunderstood, with some analyses focusing on the percentage of agents that establish rather than the overall success of the program. In reality, many programs have achieved complete or substantial control of weeds, with success rates ranging from 51% to 83%. However, programs are often judged too early, before full results are achieved, and the long time frame required for success (up to 20 years) is often overlooked. The future of biological control is promising, with recent programs showing early success in controlling weeds like Rubbervine and Solanum eleagnifolium. Many programs are still in progress, with the potential for further success. Biological control is a safe, cost-effective, and sustainable method of weed control, with an overall success rate of at least 80%. It is essential for biocontrol scientists to publicize their successes to promote this method and ensure its continued use.Biological control of weeds has achieved many successes worldwide, with 41 weeds successfully controlled using introduced insects and pathogens, and three more controlled using native fungi as mycoherbicides. These successes have been repeated in various countries and continents, saving millions of dollars and proving to be cost-effective despite high initial costs. However, biological control is not widely recognized due to factors such as poorly resourced programs, long time lags, and failure to remember past infestations. Biocontrol scientists must publicize their successes to highlight the method's effectiveness and sustainability. Many weeds have been successfully controlled, including tansy ragwort in the USA, nodding thistle in Canada and the USA, and Chromolaena odorata in the Marianas and northern Sumatra. The control of water hyacinth and salvinia has been particularly successful, with significant economic and social benefits. For example, the control of salvinia in Sri Lanka had a benefit-to-cost ratio of 1675:1. Despite these successes, many people still believe biological control has seldom worked, often due to forgetting past successes or not realizing the benefits. The success rate of biological control is often misunderstood, with some analyses focusing on the percentage of agents that establish rather than the overall success of the program. In reality, many programs have achieved complete or substantial control of weeds, with success rates ranging from 51% to 83%. However, programs are often judged too early, before full results are achieved, and the long time frame required for success (up to 20 years) is often overlooked. The future of biological control is promising, with recent programs showing early success in controlling weeds like Rubbervine and Solanum eleagnifolium. Many programs are still in progress, with the potential for further success. Biological control is a safe, cost-effective, and sustainable method of weed control, with an overall success rate of at least 80%. It is essential for biocontrol scientists to publicize their successes to promote this method and ensure its continued use.