The 4th Annual Convention of the Hawaii Weed Conference was held in Honolulu May 27 and 28, 1957. It was attended by personnel interested in weed control from the sugar and pineapple plantations, ranches, utilities, industry, the Armed Services, the Board of Agriculture and Forestry, the Hawaii Agricultural Experiment Station and Extension Service, Pineapple Research Institute and Hawaiian Sugar Planters' Association.