Effect of cowpea/maize mixed cropping on the incident light at the cowpea canopy and flower thrips (Thysanoptera: Thripidae) population density |
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| Affiliation: | 1. Graduate School of Gerontic Technology and Service management, Nan Kai University of Technology, Nan Tou County, Taiwan;2. Department of Pathology, National Defense Medical Center, Division of Clinical Pathology, Tri-Service General Hospital, Taipei, Taiwan;3. Division of Endocrinology and Metabolism, Department of Internal Medicine, Tri-Service General Hospital, Taipei, Taiwan;4. Division of Endocrinology and Metabolism, Department of Medicine, Shuang-Ho Hospital, Taipei Medical University, Taipei, Taiwan;5. Department of Family Medicine, Cardinal Tien Hospital, School of Medicine, Fu-Jen Catholic University, New Taipei, Taiwan;6. Department of Internal Medicine, Cardinal Tien Hospital, School of Medicine, Fu-Jen Catholic University, New Taipei, Taiwan;7. Department and Institute of Life-Science, Fu-Jen Catholic University, New Taipei, Taiwan;8. Department of Pathology, Cardinal Tien Hospital, School of Medicine, Fu-Jen Catholic University, New Taipei, Taiwan |
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| Abstract: | The effect of mixed cropping of cowpeas with maize on light intensity in the cowpea canopy and on population density of Megalurothrips sjostedti (Trybom) was investigated in the field and in cages. Significantly less (P< 0 · 05) light was intercepted by the cowpea canopy in the cowpea/maize mixed crop than in the cowpea crop alone. The population density and activity of M. sjostedti were significantly less in the mixed crop than in the single crop. There were significant correlations between light interception and differences in the population density of nymphs (r=0 · 79), adults (r=0 · 84) and the overall activity (r=0 · 93) of M. sjostedti. In a screenhouse choice test, M. sjostedti preferred unshaded cowpea plants to shaded ones. The results suggested that reduced light intensity in the cowpea/maize mixture contributes to the relative scarcity of M. sjostedti in the mixture. |
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