Influence of system-wide schedule of irrigation water release on occurrence and abundance of rice black bug
2009
Niones, J.T. | Sabes, P.L.P., Philippine Rice Research Inst., Bual Norte, Midsayap, North Cotabato (Philippines). Midsayap Experiment Station
To establish the influence of system-wide scheduled water release on seasonal abundance and population fluctuation of rice black bug (RBB), light traps were installed and regular field monitoring and assessment for RBB population and crop damage were done in different rice production areas of Midsayap, North Cotabato. Each site has different schedule of irrigation water release. Irrigated rice areas of Midsayap are under the operation of NIA-Libungan River Irrigation System (NIA-LIBRIS). Results show that planting pattern within Midsayap rice production areas is highly asynchronous. Planting interval between early planted areas and late planted areas reached up to maximum of four months. Comparing the RBB field population among sites, late planted sites had higher RBB population. Light trap population of RBB is higher on study sites that were first and last to establish their rice fields. Generally, the abundance of RBB population, both in light trap and field, is highly influenced by the growth stage of rice crop present at the field. RBB population is low when standing crops are at vegetative to early reproductive stages, dramatically increases towards crop maturity then reached its peak at crop maturity and early weeks of fallow period. During fallow period, different generations of RBB can be seen at the stubbles and untilled fields.
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