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Performance of Some Fungicides in Controlling Late Blight of Potato

S.M.M. Hossain
Associate Professor
Department of Plant Pathology, Hajee Mohammad Danesh Science and Technology University, Dinajpur.

M.S. Rahman
Monitoring officer
Syngenta, Bangladesh

S.M.E. Hassan
Associate Professor
Department of Plant Pathology, Hajee Mohammad Danesh Science and Technology University, Dinajpur

A.T.M.S. Islam
Associate Professor
Department of Plant Pathology, Hajee Mohammad Danesh Science and Technology University, Dinajpur

Abstract/ Executive Summary:

The experiment was conducted during 2007-2008 cropping season to determine the effectiveness and frequency of fungicidal spray for minimizing the incidence of late blight of potato. Fungicides, viz. Acrobat MZ (0.2%), Metaril 72 WP (0.2%), Nuben 72 WP (0.2%), Ridomil gold 68 WP (0.2%) and Secure 600 WG (0.1%) were included to study. All the fungicides significantly reduced the plant infection and PDI value over control. The lowest plant infection was recorded from Ridomil gold 68 WP spray. PDI decreased over control were 82.62, 81.46, 82.43, 81.66 and 84.36% for Acrobat MZ, Metaril 72 WP, Nuben 72 WP, Secure 600WG and Ridomil gold 68 WP, respectively. Maximum plant infection was found in single spray and the minimum was in triple sprayed plots.

Keywords: Late blight, Potato, Fungicide, Control

Location: Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh.

Start Date: 00-00-2007

End Date: 00-00-2008

Program Area: Pest Management

Commodity: Potato

Objectives:

To determine the effectiveness of the fungicides available to control late blight of potato in Bangladesh.

Methodology:

The experiment was conducted in experimental field of Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh during 2007-2008 cropping season to determine the performance of fungicides in minimizing the incidence of late blight of potato. The experimental plot was prepared by ploughing and cross ploughing followed by laddering to have a good tilth. Urea, triple super phosphate (TSP), Muriate of potash (MP), Gypsum, Zinc Sulphate and Boric acid were used at the rate of 325, 220, 250, 120, 14 and 6 kg per hectare, respectively. Whole quantity of TSP, MP, Gypsum, Zinc sulphate and Boron were applied at the time of final land preparation, while urea was applied in three installments; 50% at final land preparation and the rest 50% at 30 and 50 days after sowing. Apparently healthy tubers of variety Diamond were planted on November 23, 2007 maintaining spacing of row to row and tuber to tuber were 50 cm and 20 cm, respectively. The unit plot size was 2.5m x 2.5m. The experiment was laid out in a Randomized complete Block Design (RCBD) with three replications. Weeding was performed twice at an interval of 30 days. Earthing up and irrigation was executed two times; one at 30 days and another at 50 days after planting. A total of five fungicides Acrobat MZ (Dimethomorf-9% + Mancozeb- 60%) @ 0.2%, Metaril 72 WP {Methyle D, L-N-(2, 6 dimethyl phenyl)-N (2-methoxyacetyl)- alaninate} @ 0.2%, Nuben 72 WP (Metalaxyl 8% + Mancozeb 64%) @ 0.2%, Ridomil gold 68 WP {N-(2,6-Dimethyl phenyl)-N-methoxyacetyl)-D-alanine methyle ester + Mancozeb} @ 0.2%, Secure 600 WG (5-5-Methyl-2-methylio-5-Phenyl-3 Phonylamino-3,5-dihydro-4H-Imidazol-4- one) @ 0.1 %, and control were included to study the effectiveness of fungicides. Fungicidal solutions were prepared by dissolving definite amount of the chemicals in required quantity of plain water. Spray was initiated just after the detection of late blight symptoms in the experimental area and repeated thrice at an interval of 10 days. In control treatment, equal amount of plain water was sprayed. In another test, Acrobat MZ, Secure 600 WG and Ridomil gold 68 WP were used to find out the number of spray to control the disease. Single, double and triple spray were scheduled for each fungicide at 10 days interval. Care was taken during spraying to ensure both the upper and lower surface of leaves as well as stems were well covered by fungicidal solution. The experiment was carried out in split plot design with three replications. For both the experiments, data collected after ten days of last spray on %plant infection, disease severity and PDI (Percent Disease Index) were analyzed using MSTAT- C computer program. Means were compared following Duncan's Multiple Range Test (DMRT)

Source of Information: J. Sci. Technol. (Dinajpur) Vol. 8: 157-163 (2010) ISSN 1994-0386

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Ridomil gold 68 WP contain Metalaxyl and Mencozeb may be recommended for controlling late blight disease of potato. Ridomil gold 68 WP may be applied by the growers 3 times at 10 days interval just after initiation of disease.

Knowledge Management: Journal