Reference Report for IND93017443
| Title: | Influence of interrupted dew periods, relative humidity, and light on disease severity and latent infections caused by Cercospora kikuchii on soybean. |
| Authors: | Schuh, W. |
| Source: | Phytopath. 1993, 83(1):109-113 |
| Abstract: | Germination of Cercospora kikuchii conidia, at 25 C, with relative humidities of 100% wet, 100% dry, and 99%, was influenced by lightperiod regime. Germination was significantly lower at 24 h of light (35.6%) compared to 24 h of dark, to, sequentially, 12 h of light/12 h of dark, and to sequentially, 12 h of dark/12 h of light. Identical light treatments (25 C and 24 h of leaf wetness) had a similar, significant effect (P = 0.05) on disease severity, based an pairwise comparisons. When ranked, 12 h of dark/12 h of light was most conducive to infection, followed in descending order by 24 h of dark, 12 h of light/12 h of dark, and 24 h of light. Interruption of 24-h leaf-wetness periods for 4, 8, 12, and 16 h after an initial wetness period of 12 h had a significant influence on disease severity and on the number of latent infections. The effect depended on the relative humidity during the interruption. High-relative humidity (> 95%) resulted in higher disease severity and number of latent lesions with increases in interruption periods, whereas low-relative humidity (approximately 55%) resulted in lower values. The relationship between duration of leaf-wetness interruption and disease severity versus number of latent infections was statistically significant (P = 0.01) under both relative humidities. Additionally, there was evidence that the posttreatment relative-humidity conditions influenced the number of latent infections. |
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