Characterization of Environmental Factors for the Prediction of Leaf Rust of Wheat in Sargodha

Abstract

Wheat leaf rust (Puccinia recondite f. sp. tritici) is amongst major wheat diseases occurring in all wheat growing areas of Pakistan. Losses due to the infection by P. recondite f. sp. Tritici have lowered the wheat production potentially in previous years in Pakistan. This problem can be avoided by incorporating resistance against disease in wheat. In the present study eight genotypes/lines were screened and correlated with epidemiological factors i.e. temperature, relative humidity, rainfall and wind speed. The overall results revealed that among all these lines, four genotypes/lines i.e. A-24, A-20, K-11 and A-25 were susceptible to leaf rust of wheat, while the rest of four lines/genotypes i.e. A-09, A-17, A-08 and A-29 were moderately susceptible to this disease. No line/genotype showed resistant, moderately resistant or immune response to leaf rust of wheat. Correlation showed clear response of disease development to environmental factors. Maximum temperature of the disease severity was 23.8-27.15 o C. Similarly, the range of minimum temperature at which disease severity recorded maximum was 16-18 o C. The ranges of relative humidity, rainfall and wind speed on which disease severity was maximum were 60-64%, 8-22.50 mm and 11.8-12.98 Km/h, respectively. The study showed that environmental conditions of Sargodha significantly affected disease development of leaf rust of wheat.

Superior genotypic selection, epidemiological variables and fungicides application analysis associated with wheat leaf rust development and grain yield

“…Therefore, it is crucial to measure the relationship between epidemiological variables and leaf rust severity to detect its onset early on [ 46 , 47 ]. The present investigation found a significant correlation between epidemiological variables and leaf rust severity (%), which is in line with the findings of [ 10 , 13 ] who showed a significant relationship between leaf rust severity and environmental variables. The leaf rust severity (%) increased when the maximum temperature (17.8–26.8 °C) and minimum temperature (7.91–15.03 °C) increased during both rating seasons.…”

“…Moreover, sufficient precipitation is a prerequisite for the incidence of infection under low-temperature environments. Certain infections may occur when the temperature ranges from 2 °C to 32 °C with the presence of sufficient moisture [ 12 , 13 ]. In their recent study, Smith et al [ 14 ] investigated the impact of weather parameters on the progress of leaf rust.…”

Chracterization of Environmental Conditions Conducive for Leaf Rust and Genetic Diversity on Wheat Crosses Based Upon Physiomorphic Traits

“…Characterization of epidemiological variables showed that all environmental conditions remained significant against disease development. Temperature (both minimum and maximum) rapidly enhanced the urediniospores intensity at per unit area of infected leaves leading to the production of more spores per day (Milus et al, 2009;Ali et al, 2017). Under high relative humidity, appressoria germination of fungus increased between 4-25 0 C maximum and minimum temperature, respectively.…”

Status of Wheat Germplasm Resistance Against Virulent Races of Leaf and Stripe Rust in Faisalabad, Pakistan

“…striiformis, respectively, cause substantial yield losses and socio-economic instability (Rehman et al, 2013;Ali et al, 2017). The diseases develop on susceptible cultivars during suitable environmental conditions.…”