Spatio-temporal Progression of Yellow Wheat Rust in relation to Weather in NW India
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Date
2019-12
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CCSHAU, Hisar
Abstract
Field experiment entitled “Spatio-temporal progression of yellow wheat rust in
relation to weather in NW India” was conducted during rabi seasons of 2015-16 and 2016-
17 at different locations of NW India, at HAU, Hisar. The first appearance of yellow rust on
9th Jan. (2nd SMW) in Yamuna Nagar during 2015-16 and during 2016-17 the yellow rust was
observed on 29th Dec. (52 SMW) in Gurdaspur station.. Disease severity was higher (70%)
during rabi 2015-16 as compared to 2016-17 (60%). The maximum temperature, minimum
temperature and Vapour pressure deficit were positive significant correlated whereas morning
and evening relative humidity were negatively correlated with disease severity of yellow rust
and rainfall had non significant correlation with disease severity. The variability in disease
severity can be explained from 72 to 96 percent by minimum temperature and maximum
relative humidity. The spectral indices viz., NDVI, VI, NRI and NPCI were negatively
correlated with disease severity and DWSI and PSRI were positively correlated with disease
severity of yellow rust at all the locations.The best fit model based on spectral indices
explained the variability in disease severity of yellow rust up to 98 percent by NDVI and
DWSI at Jammu, 74 percent at Gurdaspur, 94 percent at Yamuna Nagar, 95 percent at Dhaula
Kuan, 97 percent at Ambala, and 92 percent at Karnal, and 99 percent at Hisar, respectively.