Variation in Brassica oleracea Resistance to Cabbage Looper and Imported Cabbage Worm in the Greenhouse and Field123

In the field, cauliflower PI 234599 was resistant to the cabbage looper, Trichoplusia ni (Hübner), and the imported cabbageworm, Pieris rapae (L.), but much less so in the greenhouse. Degree of maturity and environment influenced these resistance factors which apparently were associated with antibiosis. Red cabbages were less preferred (in both field and greenhouse) for P. rapae oviposition than other types tested. It appears feasible to transfer the resistance characteristics from PI 234599 into desirable cabbage and cauliflower lines.