HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Cox, W. J. Articles by Otis, D. J. Search for Related Content PubMed Articles by Cox, W. J. Articles by Otis, D. J. Agricola Articles by Cox, W. J. Articles by Otis, D. J.

Fungicide and Nitrogen Effects on Winter Wheat under Low Foliar Disease Severity

Dep. of Agronomy
Dep. of Agronomy
Dep. of Plant Pathology
Dep. of Plant Breeding and Biometry, Cornell Univ., Ithaca, NY 14853

^* Corresponding author.

Fungicide utilization is expected to increase on winter wheat (Triticum aestivum L.) in response to registration of fungicides that control powdery mildew (Erysiphe graminis DC) and Septoria nodorum blotch [Phaeosphaeria nodorum (Müller)]. Field experiments were conducted in New York in 1985 and 1986 on a Honeoye silt loam (fine-loamy, mixed, mesic Glossoboric Hapludalf) to examine the influence of N [67 kg ha^–1 at Zadoks Growth Stage (GS) 25, and split-application of 67 + 67 kg ha^–1 at GS 25 and GS 31], and timing of fungicide application (0.28 and 1.8 kg ha^–1 a.i. of triadimefon [1-(4-cholorphenoxy)-3,3-dimethyl-1-(1H-1,2,4-triazol-1-yl(-2-butanone] and mancozeb [zinc ion and manganese ethylene bisdithiocarbamate], respectively, at GS 31 or GS 55) on disease severity, CO₂ exchange rate (CER) of the flag leaf, yield components, and grain yield. Moderately dry and warm conditions resulted in low foliar disease severity from GS 31 to GS 55, thereby providing limited secondary inoculum to infect the flag leaf (<8% disease severity at GS 75) during excessively wet grain-filling periods. Fungicides did not influence flag leaf CER and kernel weight, which was reflected in the limited grain yield responses to fungicide applications at GS 31 and GS 55 compared to no fungicide treatment (5.90, 6.07, and 5.81 Mg ha^–1, respectively). The split-N application increased grain yield compared to the single N treatment (5.58 to 6.27 Mg ha^–1), especially in 1985 (5.47 to 6.40 Mg ha^–1) when kernels per spike were increased (26.5 to 30.2). The data suggest that high rates of N, split-applied, have potential to increase yield of winter wheat and foliar disease severity in the northeastern USA. Fungicides, however, should not be applied as a preventive measure for mildew and leaf spot control if severity is low from GS 31 to GS 60.

Received for publication May 2, 1988.

This article has been cited by other articles:

				M. Carignano, S. A. Staggenborg, and J. P. Shroyer Management Practices to Minimize Tan Spot in a Continuous Wheat Rotation Agron. J., January 11, 2008; 100(1): 145 - 153. [Abstract] [Full Text] [PDF]

				R. K. Roberts, J. T. Walters, J. A. Larson, B. C. English, and D. D. Howard Effects of Disease, Nitrogen Source, and Risk on Optimal Nitrogen Fertilization Timing in Winter Wheat Production Agron. J., May 1, 2004; 96(3): 792 - 799. [Abstract] [Full Text] [PDF]

				K. W. Kelley Planting Date and Foliar Fungicide Effects on Yield Components and Grain Traits of Winter Wheat Agron. J., March 1, 2001; 93(2): 380 - 389. [Abstract] [Full Text] [PDF]

				T. W. Katsvairo and W. J. Cox Economics of Cropping Systems Featuring Different Rotations, Tillage, and Management Agron. J., May 1, 2000; 92(3): 485 - 493. [Abstract] [Full Text]