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Experiments conducted over 3 years have determined the potential of utilizing Indian mustard and `Tastie' head cabbage multi-species borders as trap crops for management of caterpillar pests of head cabbage in Hawaii. `Scorpio', a cultivar that showed less feeding damage than `Tastie', was used as the main crop. The studies point toward the use of isolated patches of multi-species attractant crops separated from the main crop by a buffer of non-host crops such as sweet corn. A sweet corn buffer was effective in preventing insect movement between plots. Initial studies showed the high susceptibility of Indian mustard to white rust ( Albugo candida ), to be a constraint to its use as a trap crop. Follow-up studies found that `Excel' and `Parkland' mustards may be adequate substitutes for mustard crop due to their attraction of caterpillars and their tolerance to white rust. Gradient experiments conducted on 60 × 30-m plots indicate that the trap crop may be effective for a distance of 25 to 30 m in terms of attraction of caterpillars and dispersal of beneficials into the main crop. A record was also made of growth, flowering patterns, and of beneficials hosted by 12 different  Brassica  cultivars during the winter and spring growing seasons.

Implementation of Brassica spp. as Trap Crops and as Beneficial Insectaries for Caterpillar Management in Cabbage Ecosystems