Nearly 5,000 hectares of alfalfa crop in San Luis Río Colorado, Sonora, Mexico, has been devastated by a green worm infestation, reports VÍCTOR CUBILLAS Z. TRIBUNA DE SAN LUIS. Ricardo Martínez Parra, the president of the Local Board of Plant Health (JLSV), has confirmed the outbreak and is implementing insecticide treatments. The green worm is a polyphagous and migratory pest that can produce up to six generations a year in hot climates, making it a significant threat to agricultural productivity.