Radish seed-Diamondback moth

Plutella xylostella

Pest description and crop damage Diamondback larvae are about 0.31 inch when fully grown. The larval body is wider in the middle and tapers at both ends, with two legs (prolegs) on the last segment forming a distinctive V-shape at the rear end. They feed mostly on outer or more mature leaves of older plants, chewing out small holes, or at growing points of young plants. They also feed on floral stalks and flower buds. Adult moths are small, slender, and grayish brown. Male moths display three diamond-shaped markings on their back.

Management-chemical control

  • acephate (Orthene 97) at 1 lb/a (1 lb ai/a). REI 24 hr. Allow a minimum of 7 days between applications. Do not exceed 2 lb/a (2 lb ai/a) per year. Do not apply through any type of irrigation system. This product is highly toxic to bees exposed to direct treatment of residues on blooming crops or weeds. Do not apply to blooming radish seed during pollination. Bee colonies used for pollination should be removed from the field being treated prior to the application. Notify beekeepers pollinating crops within .25 mile of the field to be treated at least 48 hr prior to the application. Do not use on daikon radish. No portion of treated plants can be used for food or feed. 24c SLNs: Orthene 97 WA-050015 (expires 12/31/19). Washington only.

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