Wild Radish

Pest: Wild radish (Raphanus raphanistrum)

Pest Type: Annual Broadleaf Weed

Major Identifying Features: Erect, up to 2 feet tall, branch in the upper portion, leaves are covered with hairs, four petaled flowers with dark violet veins, white to faded yellow flowers or pale purplish-pink

Life Cycle: Winter or summer annual, biennial broadleaf, flowers from April through July, reproduces by seed

Pest Rating: Moderate

Management Rating: Difficult

Host/Season/Outbreak Information: Grows throughout California except in deserts and the Great Basin, and some mountain areas, can be found in agricultural areas and other disturbed areas

Damage Information: Susceptible to diseases that damage crops including flea beetle, thrips, blackleg of brassicas, and TYMV, also attract beneficial insects, highly competitive, one of the most widespread and competitive weeds for grain growers, prolific seeder (up to 15’000 seeds/square meter, resistant to a range of commonly used herbicides

Management Options: Chemical control with herbicides is difficult, cultural control with competitive crop, mechanical control by tilling

Sources:

grdc.com.au

http://www.ipm.ucdavis.edu

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