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field bindweed (Convolvulus arvensis L.)
ODA rating: B and T
USDA Symbol: COAR4
Oregon field bindweed distribution
Other common names
morning glory
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Images courtesy of Weed Science Society of America.

If images are downloaded and used from the ODA web site please be sure to credit the photographer.

Perennial; blooms June to September. Stems are prostrate, one to four foot long from an extensive root system that often climbs or forms dense tangled mats. Leaves alternate, arrowhead-shaped with lobes at the base. Flowers bell or trumpet shaped, white to pinkish and one inch in diameter. Fruit a small, round capsule, usually four-seeded. 
Considered a pest through out  the United States, bindweed is known for is ability to reduce crop yields by 50%. It competes with crops for moisture and nutrients, and is difficult to remove once established. The twining nature of the plant hampers harvesting of crops, especially in orchards and vineyards.
Distribution in Oregon

Biological controls
Two approved biological control agents are available, but have not been successfully established in Oregon.
Aceria malherbae
Tyta luctuosa