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| Publication Type:
| Proceedings |
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| Author(s): | Hodges, Clinton F. |
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| Author Affiliation: | Professor of Horticulture and Plant Pathology, Dept. of Horticulture, Iowa State University, Ames, IA. |
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| Title: | Some environmental and cultural effects on "Helminthosporium" diseases |
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| Source: | Florida Turf-Grass Conference Proceedings. Vol. 32, September 1984, p. 74-76. |
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| Publishing Information: | Gainesville, Florida Turf-Grass Association |
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| # of Pages: | 3 |
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| Keywords: | TIC Keywords: Drechslera; Photoperiod; Herbicides; Dicamba; Mecoprop; 2,4-D; Environmental effects; Exserohilum; Far red light
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| Abstract/Contents: | 'Helminthosporium' are members of several genera, including Bipolars, Drechslera, and Exserohilum. The development and severity of 'Helminthosporium' diseases are closely related to the environmental and cultural conditions such as: temperature, moisture, irrigation practices, fertility, mowing height, and cultivars. The leaf age-disease severity interaction is significant to photoperiod and the use of some herbicides seems to contribute to the interaction. Under long photoperiod (14 h or longer), there is little difference in leaf spot development in young or old leaves and disease severity is minimal. However, with shorter photoperiod (10 h or less), older leaves show a dramatic increase in disease severity, but with no effect on the younger leaves. Light quality studies also showed that far-red light increases disease severity and aging irrespective of photoperiod. Pre- and post-emergence herbicides used can influence leaf spot severity on Kentucky bluegrass. Most pre-emergence herbicides have little effect on or inhibit leaf spot development. Post-emergence herbicides, such as 2,4-D, dicamba and mecoprop (MCPP) are clearly capable of enhancing disease severity and seem to interact with the aging process. It has been hypothesized that the auxin-analog post-emergence herbicides enhance the leaf-aging process of the grass shoot and thereby predispose the leaves to more severe disease development after infection. |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: 2, 4 - D in Turf |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hodges, C. F. 1984. Some environmental and cultural effects on "Helminthosporium" diseases. p. 74-76. In Florida Turf-Grass Conference Proceedings. Gainesville, Florida Turf-Grass Association. |
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