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Efficacy of Fungicides to Control White Rust (albugo Occidentalis) of Red Amaranth (amaranthus Sp.)

M. M. R. Talukder
Regional Horticultural Research Station, Bangladesh Agricultural Research Institute (BARI), Lebukhali, Patuakhali

M. Riazuddin
Regional Agricultural Research Station, BARI, Rahmatpur, Barisal, Bangladesh

M. M. Rahman
Regional Agricultural Research Station, BARI, Rahmatpur, Barisal, Bangladesh

M. S. Uddin
Regional Agricultural Research Station, BARI, Rahmatpur, Barisal, Bangladesh

M. S. I Khan
Regional Agricultural Research Station, BARI, Rahmatpur, Barisal, Bangladesh

Abstract/ Executive Summary:

A field experiment was carried out to evaluate the efficacy of six fungicides to control white rust (Albugo occidentalis) of red amaranth (Amaranthus sp.). The fungicides were Sunvit @ 0.2%, Ridomil gold 68 WP (Chlorothalonil + Mefenoxam) @ 0.2%, Contaf 25 EC (Triazole) @ 0.1%, Orzim 50 WP (0.1%), Zoom 50 WP (0.1%), and X-tra care 300 EC (myclobutanil) % 0.05%. These were applied as foliar spray. The fungicides caused 8.18-70.28% reduction in severity in terms of percent disease index of white rust. On the contrary, the fungicides gave 22.31-110.50% increase in red amaranth fresh yield and 8.06-27.42% increase in 1000-seed weight. Among six fungicides tested, the most effective one to control white rust and to increase yield of red amaranth was Ridomil gold followed by Sunvit. Based on the findings of the present investigation Ridomil Gold 68 WP @ 0.2% foliar spray may be recommended to control white rust of red amaranth.

Keywords: White rust, Red Amaranthus, Fungicides, Redomil gold, Control

Location: Regional Agricultural Research Station (RARS), Rahmatpur, Barisal

Start Date: 00-00-2008

End Date: 00-00-2011

Program Area: Pest Management

Commodity: Red amaranth

Objectives:

The present experiment was conducted to test some available fungicides against white rust of red amaranth with a view to select an effective fungicide to control the disease.

Methodology:

Six fungicides namely Sunvit (0.2%), Ridomil gold 68 WP ((Chlorothalonil + Mefenoxam @ 0.2%), Contaf 25 EC (Triazole @ 0.01%), Orzim 50WP (0.01%), Zoom 50 WP (0.01%), X-Tra care 300 EC (0.05%) were tested against white rust of red amaranth under natural field condition. The experiment was conducted in the experimental farm of Regional Agricultural Research Station (RARS), Rahmatpur, Barisal during 2008-2009, 2009-2010, 2010-2011. The experimental plots were prepared following standard procedures and standard doses of manure and fertilizers were used. The experiment was laid out in a randomized complete block design with 3 replications, 2 m x 2 m unit plot and 1m distance between blocks and plots. Seeds of an amaranth variety BARI Lal shak-1 were sown in continuous lines maintaining 50 cm line to line distance. The fungicides were suspended in tap water and applied as foliar spray for 3 times starting from appearance of the disease with 15 days interval. Plants in control plots were sprayed with plain water. Fifteen days after last spray, the severity of white rust was indexed on a 0-5 rating scale, where 0 = No infection, 1 = 10% leaf area infected, 2 = 11-30% leaf area infected, 3 = 31-50% leaf area infected, 4 = 51-70 % leaf area infected and 5 = 71% and above leaf area infected. The disease severity was expressed in percent disease index (PDI). The PDI was computed following a standard formula as: PDI = (Sumof DiseasescorexNumberof leafinthatscore/Total number of leaves checked x thehighest disease score) x 100. When amaranth plants were suitable for harvest as vegetable, an area of 1 m² were randomly selected from each unit plot and harvested. Fresh weight of harvested red amaranth was measured and the yield was expressed as g/m². After maturation, seeds were also harvested from an area of 1 m² per plot. The yield of amaranth vegetable and seeds were expressed in kg/ha. Collected data were analyzed following standard statistical procedure. Treatment means were compared using DMRT.

Source of Information: Bangladesh J. Plant Pathol. Vol. 28(1&2):15-17, 2012; ISSN 1012-9279

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Results of the present study revealed that Ridomil gold and Sunvit gave an average of 70.28 and 47.23% decrease in white rust severity (PDI), 110.50 and 97.91% increase in red amaranth yield and 27.42 and 7.26% increase in 1000-seed weight. Other fungicides gave 8.18-40.52 decrease in PDI, 22.31-62.85 increase in red amaranth yield and 8.06- 12.90% increase in 1000-seed weight. Among six fungicides tested, the most effective fungicide to control white rust and to increase yield of red amaranth was Ridomil gold followed by Sunvit. Other investigators also effectiveness of fungicides to control white rust of amaranth. Based on this results Ridomil Gold 68 WP @ 0.2% foliar spray may be recommended to control white rust of red amaranth.

Knowledge Management: Journal