Seasonal fluctuation of yellow stem borer and other arthropods at PhilRice [Philippine Rice Research] Central Experiment Station [Nueva Ecija, Philippines]
2019
Santiago, G.C. | Valdez, E.M.
Insect pest management employs several tactics compatible with each other to become effective. Generally, insect pests are widely distributed and oftentimes their populations overlap. Hence, management is difficult and strategies differ from one pest to another and with different insect growth stages. Knowing the right time to apply intervention is necessary for better pest management. One tool to determine population fluctuations of different arthropods is through light trapping as it provides significant clues to the diversity of insects active at prevailing water conditions. Light trap collections showed that adult yellow stem borer (YSB) population peaked in March (dry season) with 232 moths and in September (wet season) with 48. The highest number of brown planthoppers was in March (2,328) and August (4,552). The trend was similar for other hoppers: zigzag (ZLH) and green leaf hoppers, and white-backed planthopper. Among pests, ZLH was the highest among with 12,692 individual trapped in populations were comparatively low. The mirid bug predominated among natural enemies and its populations were comparatively low. The mirid bug predominated among natural enemies and were very low in all crop growth stages. This was due to the low YSB population throughout the study. Weather the data was also correlated to the number of arthropods collected the study.
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