Abstract: Crop producers in temperate regions may be able to control field bindweed, an aggressive perennial weed, by utilizing tillage to bring roots to the surface where they can be consumed by ruminant livestock. The objectives of this study were to provide first perspectives on forage nutritive value of field bindweed roots and to determine root chemistry responses to Aceria malherbae, an eriophyid mite that has been released for field bindweed biocontrol in western USA and Canada. To accomplish these objectives, roots systems were sampled from A. malherbae-infested and non-infested plants occurring in an agricultural field in eastern New Mexico. Sampling took place during autumn and spring of each year for three consecutive years. Results indicated that A. malherbae reduced taproot diameter and increased root concentrations of Ca, P and Mg. However, A. malherbae did not affect root concentrations of acid detergent fiber, non-fiber carbohydrates, neutral detergent fiber (NDF), crude protein (CP) and total digestible nutrients (TDN). Overall means for NDF (33.