A Rainfall-Based Model for Predicting the Regional Incidence of Wheat Seed Infection by Stagonospora nodorum in New York

Our goal was to develop a simple model for predicting the incidence of wheat seed infection by Stagonospora nodorum across western and central New York in any given year. The distribution of the incidence of seed infection by S. nodorum across the region was well described by the beta-binomial probability distribution (parameters p and θ). Mean monthly rainfalls in May and in June across western and central New York were used to predict p. The binary power law was used to predict θ. The model was validated with independent data collected from New York. The predicted distribution of seed infection incidence was not statistically different from the actual distribution of the incidence of seed infection.

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A Rainfall-Based Model for Predicting the Regional Incidence of Wheat Seed Infection by Stagonospora nodorum in New York

Handbook of Fitting Statistical Distributions with R ◽

10.1201/b10159-39 ◽

2010 ◽

pp. 1263-1280

Keyword(s):

New York ◽

Stagonospora Nodorum ◽

Seed Infection ◽

Wheat Seed

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Infection of wheat seed by Pyrenophora tritici-repentis

Canadian Journal of Botany ◽

10.1139/b94-069 ◽

1994 ◽

Vol 72 (4) ◽

pp. 510-519 ◽

Cited By ~ 13

Author(s):

A. M. C. Schilder ◽

G. C. Bergstrom

Keyword(s):

New York ◽

Flag Leaf ◽

Infection Process ◽

Tan Spot ◽

Seed Infection ◽

Wheat Seed ◽

Inoculum Concentration ◽

Pyrenophora Tritici Repentis ◽

Key Words Wheat ◽

Late Stages

The seed infection process of Pyrenophora tritici-repentis, incitant of tan spot of wheat, was investigated, as were several influencing factors. Following inoculation of the wheat spike, P. tritici-repentis gained access to the seed by first colonizing the glume, lemma, or palea. Seed infection was first observed 3 d after inoculation, and infection incidence increased with time and with inoculum concentration. Wheat seeds were susceptible to infection by this fungus throughout most of their development, although inoculation at the milk stage resulted in the highest percentage of infected seeds. Susceptibility to foliar infection by P. tritici-repentis was not a good predictor of susceptibility to seed infection in four wheat cultivars tested in a glasshouse experiment, except perhaps in ‘BR 8’, which was significantly less susceptible than the other cultivars at early and late stages of seed development. In a field experiment, wheat seed infection by P. tritici-repentis occurred primarily after the early dough stage and was positively correlated with tan spot severity on the flag leaf shortly after anthesis. Key words: wheat, Pyrenophora tritici-repentis, Drechslera tritici-repentis, tan spot, seed infection, New York.

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Differential Seed Infection of Wheat Cultivars by Stagonospora nodorum

Plant Disease ◽

10.1094/pdis.2000.84.7.749 ◽

2000 ◽

Vol 84 (7) ◽

pp. 749-752 ◽

Cited By ~ 12

Author(s):

Denis A. Shah ◽

Gary C. Bergstrom ◽

Mark E. Sorrells

Keyword(s):

New York ◽

Winter Wheat ◽

Agar Medium ◽

Stagonospora Nodorum ◽

Seed Infection ◽

Wheat Cultivars ◽

Production Environment ◽

Flag Leaves ◽

Initial Inoculum ◽

Relative Susceptibility

Seed of soft white winter wheat collected from New York regional cultivar trials in 1995 and 1996 were assayed on an agar medium selective for Stagonospora nodorum. Incidence of seed infection varied with production environment. Relative incidence of seed infection differed significantly among cultivars and was consistent across environments. The flag leaves and ears of 12 cultivars were inoculated quantitatively at flowering in a glasshouse. Cultivars did not differ significantly in disease on the flag leaves. Incidence of seed infection for all cultivars was above 60%, but was significantly lower in Delaware and Houser than in other cultivars. Results confirm that wheat cultivars differ in their relative susceptibility to seed infection by S. nodorum. Resistance in wheat to seed infection by S. nodorum may be a useful mechanism for reducing initial inoculum in areas where infected seed is considered the primary inoculum source for Stagonospora nodorum blotch.

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