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In the southwestern U.S. growing region, which includes southern New Mexico, west Texas, and southeastern Arizona, mechanical harvest of chile peppers (Capsicum annuum) is increasing because of the high cost of hand labor. Mechanical harvesters have been developed, but there is limited information on the performance of chile cultivars when machine harvested. Four red chile pepper cultivars (New Mexico 6-4, Sonora, B-18, and B-58) were grown in a farmer’s field near Las Cruces, N.M., and harvested in October 2000 using a double-helix-type harvester. Ethephon was applied 3 weeks before harvest at 1.5 pt/acre (1.75 L·ha–1 ) to promote uniform ripening. Ethephon caused fruit of ‘B-18’ and ‘B-58’ to drop before harvest, thereby affecting yield results. Treatment with ethylene-releasing compounds is not recommended for these cultivars. ‘Sonora’ and ‘New Mexico 6-4’ PGRs successfully inhibited stem elongation of the three Hibiscus spp. This information, combined with previously identified impacts of photoperiod and temperature on floral initiation of H. radiatus and H. trionum (Warner and Erwin, 2001) provide a basis for developing production schedules for these species. Further work is needed to understand floral inductive requirements of H. coccineus.

Yield and Quality of Machine Harvested Red Chile Peppers