Field bindweed

Pest: Field bindweed (Convolvulus arvensis)

Pest Type: Perennial Broadleaf Weed

Major Identifying Features: One of the most problematic weeds in agricultural fields worldwide, cotyledons are square shaped, resembles morning glory but are much smaller, leaves are lobed at the base, stems grow to several feet long, trail along the ground or climb on upright plants, trumped-shaped flowers, white-purple flowers that close in the afternoon, it is drought tolerant

Life Cycle: Perennial, flowers from April through October, spreads by seeds and underground horizontal stems (rhizomes)

Pest Rating: Moderate

Management Rating: Very difficult

Host/Season/Outbreak Information: Grows throughout California up to 5000 feet elevation, difficult in potatoes, beans, and cereals, grows in heavy clay soils rather than sandy soils

Damage Information: Can harbor the viruses that cause potato X disease, tomato spotted wilt, and vaccinium false bottom, vigorous root and rhizome system, can survive in soil up to 60 years

Management Options: Difficult to control even with chemicals, prevention by removing seedlings before they become perennials and removing plants before they go to seed, cultural control by shading with bigger crops, by hoeing and cultivation, mechanical control by mulching and mowing, chemical control with herbicides, WARNING ON THE USE OF CHEMICALS

Sources:

http://www.ipm.ucanr.edu

http://www.ipm.ucdavis.edu

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