Measuring the Severity of Eyespot Disease Induced by Pseudocercosporella herpotrichoides (Fron) Deighton in Wheat Cultivars at Different Growth Stages

Fusarium graminearum Schwabe [teleomorph Gibberella zeae (Schwein) Petch] is the predominant causal agent of Fusarium head blight (FHB), an economically important disease of wheat, in North America. Warm and humid environments at and shortly after anthesis favour FHB. FHB results in yield losses and quality losses in infected grain due to the accumulation of mycotoxins produced by the invading fungus. The objective of this study was to characterise the influence of different F. graminearum isolates and host resistance on FHB development and mycotoxin accumulation. A series of two greenhouse experiments were established where five single isolates of F. graminearum were tested. Three wheat cultivars were examined: Alsen (moderately resistant), 2375 (moderately susceptible) and Wheaton (susceptible). In the point-inoculation experiments, ca. 1000 conidia were placed into a central spikelet of spikes at anthesis. Point-inoculated spikelets were sampled at different growth stages up to soft dough stage. Samples from both experiment series were analysed for mycotoxins. The susceptible cultivar Wheaton had both the highest FHB severity and mycotoxin accumulation. The spread of symptoms both below and above the inoculated central spikelet was significantly higher in 2375 and Wheaton than Alsen. Though deoxynivalenol (DON) did not peak and decline in all experiments, when a peak in the DON content was present it was earlier in 2375 (early milk) than in either Alsen (early dough) or Wheaton (late milk). Though the isolates did not rank similarly in all experiments and in all cultivars, generally isolates Butte86Ada-11 and B63A were more aggressive and isolates 49-3 and B45A were less aggressive in terms of disease severity and mycotoxin accumulation.

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PERFORMANCE OF FOURTEEN EGYPTIAN WHEAT CULTIVARS TO STRIPE RUST AT DIFFERENT GROWTH STAGES

Journal of Plant Production ◽

10.21608/jpp.2009.117188 ◽

2009 ◽

Vol 34 (4) ◽

pp. 3633-3638

Author(s):

A. Abu Aly ◽

M. Abdel Kader ◽

S. El-Sawi

Keyword(s):

Stripe Rust ◽

Growth Stages ◽

Wheat Cultivars ◽

Different Growth Stages

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Effects of varying nitrogen supply at different growth stages on nitrogen uptake and nitrogen partitioning efficiency in two wheat cultivars

Fertilizer Research ◽

10.1007/bf01054803 ◽

1990 ◽

Vol 22 (1) ◽

pp. 21-27 ◽

Cited By ~ 3

Author(s):

S. J. Sarandon ◽

D. O. Caldiz

Keyword(s):

Nitrogen Uptake ◽

Nitrogen Supply ◽

Nitrogen Partitioning ◽

Growth Stages ◽

Wheat Cultivars ◽

Different Growth Stages

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Growth And Yield Components Of Wheat Under Water Stress Of Different Growth Stages

Bangladesh Journal of Agricultural Research ◽

10.3329/bjar.v36i3.9264 ◽

1970 ◽

Vol 36 (3) ◽

pp. 455-468 ◽

Cited By ~ 36

Author(s):

M Akram

Keyword(s):

Triticum Aestivum ◽

Water Stress ◽

Yield Components ◽

Growth And Yield ◽

Growth Stages ◽

Wheat Cultivars ◽

Yield And Yield Components ◽

Relative Water ◽

Different Growth Stages ◽

Water Contents

A field experiment was conducted to determine the sensitivity of wheat to water stress and changes in water relations and yield of wheat (Triticum aestivum L.) under water stress conditions applied at different growth stages. The experiment comprised of two wheat cultivars and four water stress treatments, maintained by withholding water at tillering, anthesis, and at both stages. Water stress caused reduction in leaf relative water contents, water potential, osmotic potential, turgor potential, growth and yield components of both the wheat cultivars. The results indicated that high value of relative water contents were associated with increased yield and yield components. Consecutive stresses at both growth stages caused severe reduction in yield and yield components in both cultivars of wheat. Keywords: Water stress; water relations; growth; Triticum aestivum; yield components. DOI: http://dx.doi.org/10.3329/bjar.v36i3.9264 BJAR 2011; 36(3): 455-468

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WHEAT RESPONSE TO 2,4-D APPLICATION AT TWO GROWTH STAGES UNDER SEMI-ARID CONDITIONS

Acta Agronomica Hungarica ◽

10.1556/aagr.49.2001.4.10 ◽

2001 ◽

Vol 49 (4) ◽

pp. 387-391 ◽

Cited By ~ 4

Author(s):

M. A. TURK ◽

A. M. TAWAHA

Keyword(s):

Growth Stages ◽

Wheat Cultivars ◽

Fresh Weight ◽

Growing Seasons ◽

Weed Growth ◽

Arid Conditions ◽

Hand Weeding ◽

Different Growth Stages ◽

Semi Arid ◽

Northern Jordan

A 2-year field study was conducted during the rainy seasons of 1999 and 2000 at Houfa in northern Jordan, to study the performance of two wheat cultivars ACSAD 65 and F8 and their response to hand weeding (practised monthly during the growing seasons) and 2,4-D application at different growth stages. In both growing seasons, no significant differences (P≤0.05) in grain yield were recorded between the cultivars studied. Differences in weed number and fresh weight were significant between the various treatments in both seasons. Hand weeding proved the best method of weed control. In both growing seasons, yield reductions occurred when 2,4-D was applied to wheat, irrespective of the stage of application. Hand weeding treatment was more effective than 2,4-D application in suppressing weed growth.

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Wheat stripe rust control using fungicides in New Zealand

New Zealand Plant Protection ◽

10.30843/nzpp.2006.59.4549 ◽

2006 ◽

Vol 59 ◽

pp. 155-159

Author(s):

S.L.H. Viljanen-Rollinson ◽

M.V. Marroni ◽

R.C. Butler

Keyword(s):

Stripe Rust ◽

Leaf Age ◽

Good Control ◽

Growth Stages ◽

Wheat Cultivars ◽

Rust Disease ◽

Wheat Stripe Rust ◽

Progress Curve ◽

Different Levels ◽

Different Growth Stages

A field trial in 2005 used eight fungicide treatments and two wheat cultivars Karamu and Kohika differing in susceptibility to wheat stripe rust Fungicides were applied at different growth stages of the crop and different levels of stripe rust Disease severity assessments percent leaf area infected for individual plants and leaves were made at regular intervals and area under the disease progress curve (AU DPC) was calculated Mean AU DPC was lowest in the Full Protectant and Late window treatments for all leaves on both cultivars and greatest in the Nil plots for both cultivars Mean AU DPC generally increased with leaf age for Kohika so that flag (F) leaves had the lowest and F3 the greatest mean AU DPC The same trend occurred on Karamu leaves but was not statistically significant Two welltimed fungicide applications achieved as good control of stripe rust in both Karamu and Kohika as the full fungicide treatment

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