Knowledge Center Catalog

Local cover image
Local cover image

Epidemiology of foliar blights (spot blotch and tan spot) of wheat in the plains bordering the Himalayas

By: Contributor(s): Material type: TextTextPublication details: Kathmandu (Nepal) CIMMYT : 2004Description: p. 9-35Subject(s): Summary: Duveiller, E., Kandel, Y.R., Sharma, R.C., and Shrestha, S.M. 2004. Epidemiology of Foliar Blights (Spot Blotch and Tan Spot) of Wheat in the Plains Bordering the Himalayas. Phytopathology Helminthosporium leaf blight (HLB) caused by Cochliobolus sativus and Pyrenophora tritici- repentis is a serious constraint to wheat yields in the plains of South Asia. This study elucidates HLB development and its impact on yield. Analysis of disease progress showed the role of sowing time and growth stage on severity. C. sativus and P. tritici-repentis were first observed on leaves sampled at the seedling and tillering stages, respectively. Leaf infections progressed slowly for four to six weeks after sowing and then developed rapidly as mean temperature increased. Airborne conidia of C. sativus and P. tritici-repentis were observed seven weeks after emergence. They peaked close to harvest time, with C. sativus conidia outnumbering P; tritici-repentis. Seed infection is likely a source of primary inoculum. The disease caused an average 30% reduction in grain yield, with higher losses under delayed seeding. Increase in AUDPC per day or per degree-day better explained potential yield losses. This study using six contrasting genotypes is the first detailed report on the epidemiology of foliar blight pathogens in South Asia. Relative humidity and temperature favored the epidemic. The study shows the importance of combining crop management and genetic resistance for controlling HLB in the warmer wheat growing areas.
Tags from this library: No tags from this library for this title. Log in to add tags.
Star ratings
    Average rating: 0.0 (0 votes)
Holdings
Item type Current library Collection Call number Copy number Status Date due Barcode Item holds
Reprint CIMMYT Knowledge Center: John Woolston Library CIMMYT Staff Publications Collection CIS-4077 (Browse shelf(Opens below)) 1 Available 630078
Total holds: 0

Duveiller, E., Kandel, Y.R., Sharma, R.C., and Shrestha, S.M. 2004. Epidemiology of Foliar Blights (Spot Blotch and Tan Spot) of Wheat in the Plains Bordering the Himalayas. Phytopathology Helminthosporium leaf blight (HLB) caused by Cochliobolus sativus and Pyrenophora tritici- repentis is a serious constraint to wheat yields in the plains of South Asia. This study elucidates HLB development and its impact on yield. Analysis of disease progress showed the role of sowing time and growth stage on severity. C. sativus and P. tritici-repentis were first observed on leaves sampled at the seedling and tillering stages, respectively. Leaf infections progressed slowly for four to six weeks after sowing and then developed rapidly as mean temperature increased. Airborne conidia of C. sativus and P. tritici-repentis were observed seven weeks after emergence. They peaked close to harvest time, with C. sativus conidia outnumbering P; tritici-repentis. Seed infection is likely a source of primary inoculum. The disease caused an average 30% reduction in grain yield, with higher losses under delayed seeding. Increase in AUDPC per day or per degree-day better explained potential yield losses. This study using six contrasting genotypes is the first detailed report on the epidemiology of foliar blight pathogens in South Asia. Relative humidity and temperature favored the epidemic. The study shows the importance of combining crop management and genetic resistance for controlling HLB in the warmer wheat growing areas.

English

0407|AGRIS 0401|AL-Wheat Program

Juan Carlos Mendieta

CIMMYT Staff Publications Collection

Click on an image to view it in the image viewer

Local cover image

International Maize and Wheat Improvement Center (CIMMYT) © Copyright 2021.
Carretera México-Veracruz. Km. 45, El Batán, Texcoco, México, C.P. 56237.
If you have any question, please contact us at
CIMMYT-Knowledge-Center@cgiar.org