INSECT PESTS OF RED CABBAGE (Brassica oleracea L.) AND LIFE CYCLE OF THE CABBAGE WORM, Crocidolomia pavonana (FABRICIUS), IN LANAO DEL SUR PROVINCE, PHILIPPINES
A study was conducted in Mindanao State University, Marawi City, Lanao del Sur Province, Autonomous Region of Muslim Mindanao (ARMM) in Southern Philippines from October, 2014 to February, 2015 to identify insect pests associated with red cabbage (Brassica oleracea L. var. capitata L. f. rubra L.) and to study the life cycle of the particular pest that causes the greatest damage to it. Insects on red cabbage belong to 12 families under seven orders. Red cabbage pests belong to orders Lepidoptera, Coleoptera, Hemiptera and Orthoptera. Among these, the cabbage worm, Crocidolomia pavonana (Fabricius), was the major insect pest that caused 100% harvest loss to red cabbage grown under Lanao del Sur conditions. The minor pests were identified as the diamondback moth Plutella xylostella (L.), aphids (Myzus sp.), curculionid beetle (Metapocyrtus sp.), cabbage white moth (Euproctis sp.) and grasshoppers [Ailopus thalassinus (Fabricius), Heteroptermis sp. and Atractomorpha psittacina (Haan)]. Beneficial insects belong to Diptera, Hymenoptera and Neuroptera, which include a syrphid fly, a vespid wasp and a green lacewing, respectively. Under laboratory conditions, the mean life cycle of C. pavonana lasted 25.96 days (22-31); the mean egg incubation period was 4.42 days (4-5) while percentage of egg hatchability ranged from 22 to 100 with a mean of 73.90. There are four larval instars with a mean larval duration of 13.84 days (12-26) while the pupal stage lasted 7.70 days (6-9). Adult males lived up to 17.20 days (14-22) while females lived longer, up to 19.80 days (13-25). Female moths laid an average of 8.50 egg clusters (5-15) containing an average of 208.80 eggs (40-424) throughout their lifetime.
Key words: cabbage worm, Crocidolomia pavonana, insect pests, life cycle, red cabbage
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