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Seasonal Abundance of Rice Stem Borer Species in Upland and Irrigated Rice in Nigeria

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Abstract

Studies were carried out in 1983 to determine the relative abundance and species composition of three lepidopterous stem borers in upland and irrigated rice at Ibadan, southwestern Nigeria. The relationship between irrigated rice crop phenology and the population of the borers and stalk-eyed fly was also studied.

White stem borer, Maliarpha separatella was the predominant species in upland and irrigated rice, followed in upland rice by pink stem borer, Sesamia calamistis, and striped stem borer, Chilo zacconius and in irrigated rice by C. zacconius and S. calamistis. The proportion of M. separatella was higher in irrigated rice than upland. Three population peaks were observed annually in both upland and irrigated rice.

Studies on the relationship between irrigated rice phenology and field population of lepidopterous borers and a dipteran borer showed that the stalk-eyed fly, Diopsis spp., occurred before 20 days after transplanting (DAT) in ITA 212 and continued up to 90 DAT: the peak was observed at 40 DAT. The lepidopterous borers did not appear until 40 DAT and populations peaked at 80 DAT.

Résumé

Des études ont été menées en vue de déterminer l’abondance relative et la composition spécifique de trois lépidoptères mineurs des tiges du riz pluvial et irrigué à Ibadan, dans le sud-ouest du Nigéria. Elles visaient en outre à déterminer la relation existant entre la phénologie du riz irrigué et la population de ces borers et de la diopside, Diopsis spp.

Maliarpha separatella fut l’espèce prédominante en riziculture pluviale et irriguée, suivi de Sesamia calamistis et de Chilo zacconius en riziculture pluviale, de C. zacconius et S. calamistis en riziculture irriguée. Trois pics de densité maximale furent observés chez les trois lépidoptères au cours de l’année, tant en conditions pluviale qu’irriguée.

Les travaux sur la relation entre la phénologie du riz irrigué et la population a champ des lépidoptères et du diptère indiquent que ce dernier, Diopsis spp., fit son apparition avant le 20 éme jour suivant le repiquage (Jar) et subsista jusqu’à 90 Jar. Les lepidoptères ne se manifestèrent pas avant le 40 Jar. La densité maximale fut atteinte 80 Jar chez la variété ITA 212.

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Alam, M.S. Seasonal Abundance of Rice Stem Borer Species in Upland and Irrigated Rice in Nigeria. Int J Trop Insect Sci 9, 191–195 (1988). https://doi.org/10.1017/S1742758400005956

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  • DOI: https://doi.org/10.1017/S1742758400005956

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