Abstract
Chlorpyrifos 15% granular (15G) insecticide treatments, incorporated into potting soils (0, 2.5, 5.0, 10.0, and 20.0 mg [AI] per cell) in which cabbage and broccoli transplants were grown, were evaluated for phytotoxicity and reduction of damage from field infestations of cabbage root maggot, Delia radicum L., during 1985 and 1986. The 20.0-mg dose was significantly more phytotoxic to both cabbage and broccoli than other treatments. Root ratings of root maggot damage revealed a significant dose-response relationship, with no differences between cabbage or broccoli. The 10.0- and 20.0-mg doses yielded significantly lower root ratings than did the other insecticide treatments. The incorporation of chlorpyrifos 15G into potting soil in which transplants are grown may be an efficacious, economical, and labor-saving procedure for suppression of cabbage root maggot damage to transplanted crucifers.
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