Consultants with Boise-based Amalgamated Sugar Co. report pockets of Leafminers and Armyworms are starting to appear in Treasure Valley sugar beet fields.
A May 31 notice from the Pacific Northwest Pest Alert Network said growers who encounter the pests should contact an Amalgamated crop consultant for details and treatment options.
A network handbook said Leafminers feed on leaves, leaving irregular transparent windows, blotches and winding tunnels. The Leafminer is an increasingly important pest in some areas, having rarely reached economically damaging levels earlier. The pest is of particular concern in early season, when beet stands are establishing.
Damage from Armyworms appears as skeletonized leaves on the sugar beet plant with only leaf veins and petioles remaining, a network handbook said. The worms occasionally can defoliate plants substantially, especially in western Idaho. In dense infestations, they can migrate among fields.