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Assessment of Yield Losses Due to Leaf Rust at Different Growth Stages of Wheat

P. K. Malaker
Wheat Research Centre, BARI

M. M. A. Reza
Wheat Research Centre, BARI

K. Mustarin
Wheat Research Centre, BARI

Abstract/ Executive Summary:

A study was conducted at the Wheat Research Centre, BARI to assess yield losses in wheat caused due to leaf rust under field condition. Losses in grain yield ranged 5-32% in Prodip and 7-23% in BARI Gom 26 under different sowing dates. Significant variations in leaf rust severity, 1000-grain weight and grain yield were observed for sowing date (A), fungicide protection (B) and variety (C). Interactions between different factors were also found significant for different variables except A x C, B x C and A x B x C for grain yield. Severity of leaf rust and losses in 1000-grain weight and grain yield varied between the varieties Prodip and BARI Gom 26 used in the present investigation. Losses recorded in Prodip were higher than BARI Gom 26 under late sown condition. In general, disease severity and losses in grain weight and yield were higher under late planted compared to timely planted condition. Losses recorded in Prodip were higher than BARI Gom 26 under late sown condition. Severity of leaf rust and losses in grain weight and yield increased with the increasing delay of sowing.

Keywords: Leaf rust, Infection, Urediospore, Wheat

Location: Wheat Research Centre, BARI

Start Date: 00-00-2014

End Date: 00-00-2015

Program Area: Pest Management

Commodity: Diseases

Objectives:

To determine the losses caused to the variety due to leaf rust infection at various growth stages under different sowing dates.

Methodology:

The leaf rust susceptible variety Prodip and slow leaf rusting variety BARI Gom 26 were sown at seven different dates. Sowing commenced from 17 Nov. 2014 with seven days intervals. One of the two plots of both varieties under each sowing date was protected from leaf rust by spraying with Tilt 250 EC and the other was kept unprotected. Split-split-plot design was followed with sowing dates in main plot, fungicide protection in sub-plot and varieties in sub-sub-plot. Unit plot size was 3 m x 1.6 m. The experiment was surrounded by spreader rows of susceptible varieties. Spreader rows were inoculated at booting stage by spraying with aqueous suspension of urediospores to develop leaf rust epidemic. Disease severity was recorded at different growth stages using modified Cobb scale (Stubbs et al. 1986). Data were also taken on 1000-grain weight and grain yield from both sprayed and unsprayed plots, and percent losses in these parameters were calculated under different sowing dates.

Source of Information: Annual Research Report, Wheat Research Centre, BARI--2014-15

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Leaf rust severity and losses in 1000-grain weight and grain yield increased with the increasing delay of sowing. Losses in grain weight and yield of Prodip were higher than BARI Gom 26 under late planting condition

Knowledge Management: