Pest problem and the use of pesticides in grain storage in Thailand
Postharvest pest problems and control measures in Thailand are reviewed. Some seventy species of insects and various types of rodents have been recorded infesting stored grain and other agricultural products. Sitrotroga cerlalella, Rhyzopertha dominica, and Sitophilus spp. are the dominant pests of stored paddy, while the most abundant species found in milled rice are Sitophilus spp., Tribolium castaneum, and Corcyra cephalonica. The Sitophilus spp. group are the only major pests of stored maize, sorghum, and wheat. Rhyzopertha dominica has become more important than Sitophilus spp. as a pest of stored barley, while in grain legumes the major pests are Callosobruchus maculatus and C. chinensis, with the former being more abundant. Estimates of percentage losses due to insects vary between 1 and 25 percent. A recent study in which 20 varieties of paddy seed were stored unprotected for 10 months revealed losses between 2 and 24 percent, with an average of 4.5 percent. Although some insecticides have been recommended for use in grain storages, their application has been limited to seed and for treatment of the storage structure: they have not been applied directly to bag or bulk grain. On the other hand, fumigation with methylbromide or phosphine is general practice in commercial stores. Methylbromide is preferred, because of the shorter exposure periods needed
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| Format: | biblioteca |
| Published: |
Canberra (Australia)
1985
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| Subjects: | PLAGAS DE PRODUCTOS ALMACENADOS, CEREALES, CONTROL DE PLAGAS, INSECTICIDAS, TAILANDIA, |
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| Summary: | Postharvest pest problems and control measures in Thailand are reviewed. Some seventy species of insects and various types of rodents have been recorded infesting stored grain and other agricultural products. Sitrotroga cerlalella, Rhyzopertha dominica, and Sitophilus spp. are the dominant pests of stored paddy, while the most abundant species found in milled rice are Sitophilus spp., Tribolium castaneum, and Corcyra cephalonica. The Sitophilus spp. group are the only major pests of stored maize, sorghum, and wheat. Rhyzopertha dominica has become more important than Sitophilus spp. as a pest of stored barley, while in grain legumes the major pests are Callosobruchus maculatus and C. chinensis, with the former being more abundant. Estimates of percentage losses due to insects vary between 1 and 25 percent. A recent study in which 20 varieties of paddy seed were stored unprotected for 10 months revealed losses between 2 and 24 percent, with an average of 4.5 percent. Although some insecticides have been recommended for use in grain storages, their application has been limited to seed and for treatment of the storage structure: they have not been applied directly to bag or bulk grain. On the other hand, fumigation with methylbromide or phosphine is general practice in commercial stores. Methylbromide is preferred, because of the shorter exposure periods needed |
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