Plant Protection Bulletin (Taipei) (2000) 42, 201-212

C.H. Cheng (2000)
Monitoring and forecasting of rice stem borer, Chilo suppressalis (Walker) based on the sex pheromone trap catches
Plant Protection Bulletin (Taipei) 42 (4), 201-212
Abstract: The rice stem borer (Chilo suppressalis (Walker)) has gradually resumed its importance in rice insect pests in Taiwan since the years of 1980. Occasionally, it could cause severe damage on rice sporadicically. Monitoring of its population dynamics and forecasting of the time and amount of adult emergence become importance in determination of control needed. Based on the data collected with the sex pheromone traps and the suction light traps in paddy fields from 1991 to 1999 at Chiayi, it was shown that the pheromone trap was more efficient than the suction light trap in monitoring of the population of rice stem borer though the fluctuating trend of adult catches with both methods were quite coincident. The catches with the pheromone trap were 6.9 and 2.5 times greater than that of suction light trap while the adult population were low in the overwintered and the first generation, respectively. But such differences became negligible or adverse as adult population was high in the second generation. The stem borer basically occurred five generations a year with three generations in the first cropping season and two generations in the second cropping season. The adult population in the first cropping season was markedly higher than the seconds'. Disruption of the habitat between the cropping seasons and high temperature and heavy rainfall in the early growing stage of rice in the second cropping season were the factors to limit the population in the second cropping season. The total effective temperature was not reliable to determine the emergence peak of adults for all generations, but it could be predicted with the period of the emergence peak of the preceding generation and the accumulative averaged daily temperature from December to February and from February to April for the overwintered and the first generation, respectively. One the other hand, the adult population abundance of the overwintered and the first generation were highly correlated with its preceding generation. Several predicting equations had been developed for forecasting the time and amount of adult emergence in this study for further inspect of their applicability and reliability.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Chilo suppressalis		Taiwan