行政院農業委員會台南區農業改良場  研究彙報第12號

水稻主要害蟲棲群變動研究

林文助

摘  要

本場於1977年在台南縣歸仁開始進行調查水稻主要害蟲棲群動態,茲將調查結果,摘要如下:

1.第一期作害蟲有夜盜蟲、褐飛蝨、白背飛蝨、捲葉蟲、稻心繩、黑尾葉蟬、電光葉蟬、稻蝗、一點螟蟲。

第二期作有褐飛蝨、白背飛蝨、捲葉蟲、稻心繩、黑尾葉蟬、電光葉蟬、稻蝗、一點螟蟲、二化螟蟲等。其中以褐飛蝨、捲葉蟲、一點螟蟲、黑尾葉蟬最為重要。

2.第一期作褐飛蝨密度平均每欉約2∼3隻,捲葉蟲為害葉率0.03%,一點螟穗率0.68%,黑尾葉蟬網掃每單次約有6.1隻。

3.第二期作褐飛蝨密度平均每欉有24隻,捲葉蟲為害葉率57.17%,一點螟為害穗率16.15%,黑尾葉蟬網掃每單次約有6.3隻。

4.上述四大主要害蟲於第一期作大都集中於水稻孕穗期與收獲期間,第二期作則發生於分糵期以後,直至水稻收獲。

5.稻穀每公頃產量第一期作5561公斤,似不受蟲害影響,第二期作2596公斤,約損失34.5%。


Studies of Pests Population Dynamics on Rice

W. C. Lin

Summary

        A survey on rice pests population dynamics has been conducted in 1977.  Many insect pests were found in rice field.  It included:  Spodoptera maurita Boisduval, brown rice plant-hopper (Nilaparvata lugens), white black plant-hopper (Sogata furcifera Horvata), grass leaf roller (Cnaphalocrocis medinalis Guenee), rice leaf whorl maggot (Hydrellia philippina Ferino), green rice leafhopper (Nephotettix Cincticeps Uhler), Zigzag striped leafhopper (Inazuma dorsalis Motschulsky), small rice grasshopper (Oxya intricate Stal), yellow rice borer (Tryporyza incertulas Walker), rice stem borer (Chilo suppressalis Walker), pink borer (Sesamia inferens Walker).

        The former nine pests occurred in 1st crop, while the latter ten pests occurred usually in 2nd crop.  But brown rice plant-hopper, grass leaf roller, yellow rice borer, and green rice leafhopper are always the major pests.

       In 1st crop, 2~3 rice brown plant-hoppers per hiller are found, percentage of leaf damage caused by grass leaf roller is about 0.03%, ears damaged by yellow rice borer is 0.68%, about 6.1 green rice leaf-hopper are found in every single sweep net.  These four major pests mentioned above occurred mostly between rice head-sprouting and harvesting stage in 1st crop, but in 2nd crop, its occurred between rice tillering and harvesting stage.

        Rice yield in 1st crop is 5561 kilograms per hectare, it seems that these insect pests do not cause yield loss.  In 2nd crop, rice yield is 2596 kilograms per hectare and yield loss is about 34.5%.



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