Abstract
The susceptibility of Delia radicum, cabbage maggot (CM), first instar larvae to fresh tissue extracts of two marigolds (Tagetes erecta and T. patula), the entomopathogenic nematode Steinernema feltiae, and a combination of them, was evaluated under laboratory and glasshouse conditions. In the laboratory, CM larvae were susceptible to marigold fresh tissue extracts; the root extracts were the most effective. Fresh root tissue extracts of non-flowering and flowering T. erecta caused 28% and 84% CM mortality, and T. patula caused 65% and 100% CM mortality, respectively. The nematodes caused up to 46% CM mortality at a concentration of 300 IJs/larva. In the glasshouse, up to 95% reduction of CM was achieved when cabbage plants, infected with CM eggs, were treated with fresh root extracts from either Tagetes species. Combination treatments with Tagetes and S. feltiae were also effective. Fresh tissue extracts of Tagetes spp. and S. feltiae show potential as control agents of D. radicum.
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