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Comparative effectiveness of an integrated pest management system for manag

CIG Projects in PIA | Pacific Islands Area NRCS
 CIG Projects in the Pacific Islands Area:

Comparative effectiveness of an integrated pest management system for managing the insect pests on cabbage in Guam.

Grantee: University of Guam

In the Mariana Islands, vegetables such as head cabbage, Chinese cabbage, cucumber, eggplant, bell pepper, green onion and tomato are the common crops grown in the region. Head cabbage (Brassica oleracea var. capitata) and Chinese cabbage (Brassica rapa) have been continuously grown throughout the year in Guam and the Northern Mariana Islands (Rota, Saipan and Tinian). These crops, belonging to the family Brassicaceae, are frequently attacked by a number of insect pests viz., cutworm Spodoptera litura (Lepidoptera: Noctuidae), corn earworm Helicoverpa armigera (Lepidoptera: Noctuidae), cabbage looper Chrysodeixis chalcites (Lepidoptera: Noctuidae), webworm Hellula undalis (Lepidoptera: Pyralidae), diamondback moth Plutella xylostella (Lepidoptera: Plutellidae), cluster caterpillar, Crocidolomia pavanona (Lepidoptera: Pyralidae), serpentine leafminer Liriomyza brassicae (Diptera: Agromyzidae), fleahopper, Haticus tibialis (Hemiptera: Miridae) and cabbage aphid Brevicoryne brassicae (Hemiptera: Aphididae).

The majority of growers in this region use malathion, and carbaryl insecticides for the control of the above mentioned insect pests. Usually as many as eight to 10 sprays are applied each cropping period, which is not only costly in terms of financial outlay but also is associated with ecological and toxicological hazards. The aim of the project is to replace these high risk insecticides with Neem-based biopesticide (Aza-Direct) which is reported to be both very effective and low risk.

The objectives of this project are to:

  • Compare the effect of IPM practices versus locally adopted insecticidal treatments.
  • Assessment of crop damage and yield in the IPM and other treatments.
  • Record the incidence of natural enemies in the IPM and other treatments.
  • Analyze cost: benefit of the IPM plots and other treatments.
  • Conduct field days to demonstrate the benefits of IPM practices over growers´┐Ż insecticidal treatment plots.
  • Train producers and stakeholders about IPM practices.