The effects of IPM and farmer practices on yield and pesticide residues of pakchoi (Brassica rapa L. cv pakchoi) in Central Luzon, Philippines

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  • ULRICHS Christian
    Faculty for Agriculture and Horticulture, Humboldt University Berlin
  • BURLEIGH James R.
    former Site Director for Philippine Peri-Urban Project, Asian Vegetable Research and Development Center
  • MEWIS Inga
    Leibnitz-Institute of Vegetable and Ornamental Crops, Departement Quality

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Vegetable production by most farmers in the Philippines is highly dependent on pesticides. Pesticides are commonly applied before pest species are identified and intensity assessed. Current pesticide practice can lead to as many as 19 applications in 45 days per crop of pakchoi. The integration of integrated pest management (IPM) into crop management strategies is prompted by our view that pesticide use is excessive and costly, can lead to reduced pesticide efficacy and to human health problems from consumption of vegetables with pesticide residue. We have therefore, embarked upon a program among vegetable growers to demonstrate that pest identification, monitoring of pest intensity, and judicious use of effective pesticides can be combined into a holistic strategy of crop management. For this purpose a series of IPM training materials was developed. The majority of farmers attending farmer field schools assessed the IPM materials as very useful. Prior to being trained in IPM, farmers used 300 % the amount of insecticide but only 68% of the fungicide amount than researchers who followed IPM guidelines. Use of fungicides increased because training made them aware of the damage caused by pathogens which had previously been ignored. Pesticide residue was detected in 7 of 9 field samples. In two, the amount detected exceeded maximum residue levels (MRL) established by ASEAN for Chlorpyrifos and in one sample the amount exceeded the MRL for Cypermethrin. The results are critically discussed in regard to the implementation of IPM materials.

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  • Tropics

    Tropics 19 (3), 113-122, 2011

    日本熱帯生態学会

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