Full TGIF Record # 269903
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Web URL(s):https://archive.lib.msu.edu/tic/its/articles/1974sup23a.pdf
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Publication Type:
Content Type:Abstract or summary only
Author(s):Colbaugh, P. F.; Endo, R. M.
Author Affiliation:University of California
Title:Why drought stress favors the development of Helminthosporium sativum on bluegrass
Other records with the "Diseases" Section
Meeting Info.:Blacksburg, Virginia: June 19-21, 1973
Source:Abstracts of Papers Presented at the Second International Turfgrass Research Conference. 1973, p. 23.
Publishing Information:Blacksburg, Virginia: [International Turfgrass Society]
# of Pages:1
Keywords:TIC Keywords: Bipolaris sorokiniana; Conidia; Disease profile; Disease resistance; Drought stress; Leaf spot; Poa; Pythium diseases
Abstract/Contents:"Field studies of Helminthosporium leafspot and foot rot of bluegrass caused by H. sativum have shown that the production of conidia occurs primarily in drought-stressed areas of turf. Population studies on bluegrass crop debris during the summer months indicated that numbers of conidia in drought-stressed areas were about thirty times greater than the number found in well-watered areas. The degree and incidence of infection was also greater in drought-stressed areas. Studies on the survival of inoculum placed in crop debris demonstrated that conidia and mycelium in infected plants survived for at least 14 months. Both types of inoculum probably serve as primary inoculum in the spring. The increased activity of the fungus in drought-stressed areas of turf is correlated with a rapid and increased release of carbohydrates and proteins from dried crop debris at the time of remoistening and the absence of an inhibitory factor which inhibits conidial germination. H. sativum conidia exhibited fungistasis on moist crop debris which yielded lower levels of water soluble nutrients and the presence of a fungal inhibitor. Inhibitory products have been isolated from moist crop debris but were not found in extracts from dried crop debris. The inhibitor is a polar compound and is thought to be a product of microbial activity."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Colbaugh, P. F., and R. M. Endo. 1973. Why drought stress favors the development of Helminthosporium sativum on bluegrass. Int. Turfgrass Soc. Annexe - Tech. Pap. p. 23.
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    Last checked: 03/15/2016
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