scholarly journals Wheat Stem Rust Severity and Physiological Races in North Rift Region of Kenya

2012 ◽  
Vol 6 (2) ◽  
pp. 25-32
Author(s):  
S.G. Ismail ◽  
M.G. Kinyua ◽  
A.M. Kibe ◽  
I.N. Wagara
Keyword(s):  
Stem Rust ◽  
Wheat Stem Rust ◽  
Physiological Races ◽  
Rust Severity

Physiological Races of Wheat Stem Rust in Egypt

Nature ◽  
1953 ◽  
Vol 172 (4383) ◽  
pp. 802-803 ◽  
Author(s):  
T. ABDEL-HAK
Keyword(s):  
Stem Rust ◽  
Wheat Stem Rust ◽  
Physiological Races

Potentiality of some essential oils and algae extract spray treatments on suppressing wheat stem rust severity under field conditions

2021 ◽  
pp. 1-16
Author(s):  
Mokhtar M. Abdel-Kader ◽  
Nadia G. El-Gamal ◽  
Mohamed S. A. Khalil ◽  
Nehal S. El-Mougy ◽  
Abo El-Khair Badawy El-Sayed
Keyword(s):  
Essential Oils ◽  
Stem Rust ◽  
Field Conditions ◽  
Wheat Stem Rust ◽  
Rust Severity

scholarly journals Foliar Fungicides to Control Wheat Stem Rust, Race TTKS (Ug99), in Kenya

Plant Disease ◽  
2009 ◽  
Vol 93 (9) ◽  
pp. 929-932 ◽  
Author(s):  
R. Wanyera ◽  
J. K. Macharia ◽  
S. M. Kilonzo ◽  
J. W. Kamundia
Keyword(s):  
Grain Yield ◽  
Stem Rust ◽  
Untreated Control ◽  
Block Design ◽  
Kernel Weight ◽  
Control Treatment ◽  
Wheat Stem Rust ◽  
Progress Curve ◽  
Rust Severity ◽  
Field Plots

The emergence of a new virulent race of stem rust (Puccinia graminis f. sp. tritici) of wheat (Triticum aestivum), TTKS (Ug99), calls for urgent measures to contain the disease, which is a serious threat to wheat production in Kenya. Nine commercial fungicides were evaluated for control of stem rust in the field in three locations in 2005 and 2006. Ten treatments, including untreated control, were applied on field plots in a randomized complete block design with four replications. Assessment of stem rust severity was done at growth stage (GS) 55 (heading), GS 65 (flowering), and GS 75 (late milk) and expressed in terms of mean rust severity and area under the disease progress curve (AUDPC). In general, fungicide treatment significantly (P ≤ 0.05) reduced rust severity, AUDPC, and losses in grain yield and 1,000-kernel weight for cv. Duma compared with the untreated control. Stem rust was severe in both years across all sites, resulting in significantly less grain yield in the control treatment. The 1,000-kernel weight was significantly less at two locations in 2006. Fungicides azoxystrobin at 200 g/liter + cyproconazole at 80 g/liter (AmistarXtra 280 SC), tebuconazole (Folicur 250 EC), tebuconazole + tridimenol (Silvacur 375 EC), and tebuconazole (Orius 25 EW) were more effective in reducing stem rust across the sites. Fungicides trifloxystrobin + propiconazole (Stratego 250 EC), hexaconazole (Cotaf 5 EC), epoxiconazole + carbendazim (Swing 250 EC), cyproconazole at 80 g/liter + propiconazole at 250 g/liter (Artea 330EC), and epoxiconazole at 125 g/liter + carbendazim at 125 g/liter (Soprano C 250 EC) were inconsistent in the reduction of the disease. The results suggest that fungicides can be used effectively in reducing stem rust severity and increasing yield of susceptible wheat cultivars in stem-rust-prone areas.

scholarly journals Identification of Resistance Sources to Wheat Stem Rust from Introduced Genotypes in Kenya

2017 ◽  
Vol 9 (2) ◽  
pp. 73
Author(s):  
Molly O. Akello ◽  
Felister Nzuve ◽  
Florence Olubayo ◽  
Godwin Macharia ◽  
James Muthomi
Keyword(s):  
Plant Height ◽  
Stem Rust ◽  
Agronomic Traits ◽  
Negative Relationship ◽  
Kernel Weight ◽  
Sources Of Resistance ◽  
Wheat Stem Rust ◽  
Progress Curve ◽  
Rust Severity ◽  
Infection Types

Stem rust Puccinia graminis Pers. f. sp. tritici of wheat is the most important disease in Kenya. Emergence of race Ug99 and other variants virulent to host resistance genes including Sr31 has rendered 95% of Kenyan cultivars susceptible. This study aimed to identify new sources of resistance to stem rust in a collection of exotic genotypes. Three hundred and sixteen wheat genotypes were screened at the Kenya Agricultural and Livestock Research Organization (KALRO) in Njoro for two seasons in 2015. The host reaction to disease was evaluated based on the modified Cobb scale. The relative Final Rust Severity (rFRS), Average Coefficient of Infection (ACI) and relative Area Under Disease Progress Curve (rAUDPC) were used to characterize the genotypes for stem rust resistance. Agronomic traits were also recorded. Six genotypes namely ALBW-100, ALBW- 204, EPCBW-261, EPCBW-295, PCHP-309 and PCHPBW-310 with significantly low ACI, rAUDPC and rFRS were identified. Thirty five genotypes showed Pseudo-Black Chaff (PBC) phenotype associated with resistant gene Sr2, a source of partial resistance in wheat. The genotypes also showed low disease severity (20-25%) and Moderately Susceptible (MS) – Susceptible (S) infection types in both seasons. Genotypes had significant differences (p ≤ 0.05) on plant height, 1000-kernel weight and number of tillers indicating genetic variation which could be exploited in breeding for resistance to stem rust. The negative relationship between agronomic variables involving plant height, spikelet length and 1000-kernel weight showed harmful effects of stem rust on plant characteristics including yield. The stem rust resistant genotypes with good agronomic traits could be introgressed into adapted Kenyan backgrounds while the genotypes showing presence of PBC could be utilized to develop durable stem rust resistant wheat. Inheritance studies to elucidate the exact genes conferring resistance to stem rust could be conducted for breeders to exploit their genetic variability.

Retrospective analysis of virulence of the North Caucasian population of wheat stem rust pathogen

2019 ◽  
Vol 1 (81) ◽  
pp. 85-90
Author(s):  
Galina Volkova ◽  
◽  
Olesya Miroshnichenko ◽  
Olga Tarancheva ◽  
◽  
...  
Keyword(s):  
Retrospective Analysis ◽  
Stem Rust ◽  
Caucasian Population ◽  
Wheat Stem Rust ◽  
The North ◽  
Rust Pathogen

scholarly journals Field resistance to wheat stem rust in durum wheat ( Triticum turgidum ssp. durum ) accessions deposited at the USDA National Small Grains Collection

Crop Science ◽  
2021 ◽  
Author(s):  
Pablo D. Olivera ◽  
Worku D. Bulbula ◽  
Ayele Badebo ◽  
Harold E. Bockelman ◽  
Erena A. Edae ◽  
...  
Keyword(s):  
Durum Wheat ◽  
Stem Rust ◽  
Triticum Turgidum ◽  
Field Resistance ◽  
Wheat Stem Rust ◽  
Small Grains
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