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Influence of weather factors on occurrence and development of stripe rust (Puccinia striiformis f. sp. tritici) of wheat and its management

KrishiKosh

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Title Influence of weather factors on occurrence and development of stripe rust (Puccinia striiformis f. sp. tritici) of wheat and its management
 
Creator Sunil
 
Contributor Pannu, P.P.S.
 
Subject Wheat, Stripe rust, Pathotype, Weather parameters, Incubation period, Latent period
 
Description The investigations were carried out on the present situation of stripe rust and frequency of the different pathotypes of Puccinia striiformis f. sp. tritici in the Punjab state, effect of temperature on germination of uredospores, relationship of weather parameters with development and progress of stripe
rust and its management. On the basis of surveys conducted in the Punjab state, it was found that severity
of stripe rust varied from 6.5-32.5, 2.6-28.5 and 3.5-20.5 per cent during 2010-11, 2011-12 and 2012-13
respectively. The frequency of two commonly prevalent pathotypes of P. striiformis f. sp. tritici i.e.
78S84 and 46S119 varied in three crop seasons. It was found to be in the proportion of 75:25, 35:65
and 20:80 during 2010-11, 2011-12 and 2012-13 for 78S84 and 46S119, respectively. The studies on
effect of temperature on germination of uredospores of different pathotypes revealed that maximum per
cent spore germination was 64.83, 48.85 recorded in case of pathotypes 78S84 and 67S64 respectively
at 15±2 ºC and it was 51.09 per cent for pathotype 46S119 at 12±2ºC. Germination of uredospores
produced in different months showed that maximum per cent spore germination i.e. 84.55 (Local
Isolate), 75.06 (78S84), 70.99 (46S119) and 55.85 (67S64) was observed in the month of January,
February and November, respectively. The effect of different temperatures on infection, growth and
development of different pathotypes of P. striiformis f. sp. tritici under controlled conditions revealed that different temperatures affect the incubation period, latent period and severity of stripe rust. The maximum disease severity of pathotype 78S84 was found 90 per cent with 6 days of incubation period and 9 days of latent period at 18±2ºC. Similarly, the maximum disease severity of 90 per cent with 6 days of incubation period and 9 days of latent period was recorded for pathotype 46S119 at 15±2ºC. In case of pathotype 67S64 the maximum disease severity 80 % with 6 days of incubation period and 11days of latent period was observed at 18±2ºC. It was revealed that weather conditions during different months influence incubation period, latent period and severity of yellow rust under field conditions. The latent period varied from 10-23 days, 11-21 days and 11-22 days in different months during three crop season. The simple and multiple correlation worked out between weather parameters and progress of different pathotypes revealed that weather parameters like temperature, relative humidity, rainfall and sunshine hrs during different months influence the occurrence, development and progress of stripe rust. Generally disease progress was found to be slow during December, January and was f ast during February under field conditions. Latent infection of Puccinia striiformis f. sp. tritici in wheat leaves was detected by PCR assay with genome specific primer PST2 from wheat plant suspected to be infected. Out of 11 fungicides evaluated in labo ratory and field conditions it was found that fungicides like Bayleton 50 WP, Folicur 430 SC, Picoxystrobin+ Propiconazole 20, SC Tilt 25 EC, Amistar xtra 280 SC, Amistar top 325 EC, Folicur 25 EC, Orius 250EC, Opera 25 EC, Nativo 75WP were found highly effective against the stripe rust.
 
Date 2016-08-06T12:03:38Z
2016-08-06T12:03:38Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/71219
 
Language en
 
Format application/pdf
 
Publisher PAU