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This article in CS

  1. Vol. 15 No. 4, p. 591-594
     
    Received: Feb 20, 1975


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doi:10.2135/cropsci1975.0011183X001500040042x

Cephalosporium Stripe of Winter Wheat: Procedures for Determining Host Response1

  1. D. E. Mathre and
  2. R. H. Johnston2

Abstract

Abstract

Techniques were evaluated for determining the response of winter wheat (Triticum aestwum L.) to infection by Cephalosporium gramineum Nisikado and Ikata. The objective was to develop a system that would allow large scale field screening for resistance to this pathogen. Use of a root inoculation technique indicated that cultivars differed in the severity of symptoms that developed but the technique was laborious and difficult to use. An oat kernel inoculum, added with the seed at the tune of planting, produced high levels of infection and closely approximated a natural inoculum situation. Early fall seeding accompanied by the use of 10 to 20g of oat inoculum per 3.6 m of row maximized disease development. Thirty entries were evaluated for their response to this disease using the oat kernel technique. A few entries, including 'Trader,' PI 178383, and PI 347737, appeared to have a low degree of susceptibility. Counts of white heads were positively correlated with degree of yield reduction.

The oat kernel technique should be of use to plant breeders and plant pathologists interested in a screening program to develop resistant and/or tolerant cultivars.

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