Pest problems and the use of pesticides in grain storage in the Philippines
Pest problems and the use of pesticides in grain storage in the Philippines are reviewed. The major pests attacking stored rice and maize are Rhyzopertha dominica (Fabricius), Sitophilus spp., Oryzaephilus surinamensis (L.), Tribolium castaneum (Herbst), and Cryptolestes spp. The lesser grain borer (R. dominica) is the predominant pest species damaging paddy, while Sitoplilus zeamais is the main pest of stored maize. Estimates of weight losses due to insects in unprotected stored grain are 34 percent for maize stored for 8 months and 2.5 percent for milled rice stored for 3 months. Resistance to pesticides is a problem. A survey revealed that resistance to malathion in T. castaneum occurs nationwide. Cross-resistance to pirimiphos-methyl was also observed in some strains. Two types of resistance were also encountered in R. dominica: malathion-specific and cross-resistance to pirimiphos-methyl. S. zeamais was the dominant weevil in rice and the species remained susceptible to malathion and pirimiphos-methyl. The paper concludes with a listing of suggested priorities for research and development work on the use of pesticides to protect grains stored under humid tropical conditions
| Main Authors: | , , , , |
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| Format: | biblioteca |
| Published: |
Canberra (Australia)
1985
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| Subjects: | PLAGAS DE PRODUCTOS ALMACENADOS, ARROZ, ZEA MAYS, CEREALES, CONTROL DE PLAGAS, INSECTICIDAS, FILIPINAS, |
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