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Effect of Seed Tuber Treatment in Controlling Late Blight of Potato

M. M. Rahman
Plant Pathology Division, Agricultural Research Station, Bangladesh Agriculture Research Institute, Binodpur, Rajshahi, Bangladesh.

K. M. Khalequzzaman
Plant Pathology Division, Agricultural Research Station, Bangladesh Agriculture Research Institute, Binodpur, Rajshahi, Bangladesh.

T. K. Day
TCRC, Bangladesh Agriculture Research Institute, Binodpur, Rajshahi, Bangladesh.

M. A. Rahman
FRS, Bangladesh Agriculture Research Institute, Binodpur, Rajshahi, Bangladesh.

Md. Kalim Uddin
RARS, Bangladesh Agricultural Research Institute, Ishurdi, Pabna, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted during 1996-97 and 1997-98 crop season with a view to determine the effectiveness of two systemic fungicides as seed treatment against late blight of potato This was done at the Tuber Crops Research Centre, ARS, BARI, Bogra with the potato variety cardinal. Potato seeds were used as whole and cut tuber and fungicides were applied on seed as dipping and spray. There were 10 treatments, each having three replications. The results of the investigation indicated that, Ridomil as seed treatment was promising in delaying onset of late blight disease symptoms compared to Acrobat Mz as well as control whether applied on seed in the form of spray or dipping. Seed tuber dipping in Ridomil solution appeared more effective compared to spray on seed tuber under both the crop seasons whatever seed tuber used;whole or cut. Between the two fungicides, effectiveness of Ridomil in suppressing the disease incidence and its subsequent spread was more pronounced compared to Acrobat Mz in all dates of data recording in all the two crop seasons except 80 DAP during 1996-97. Although there was no significant difference between the two fungicides whether used as cut and whole tuber and as dipping or spray on tuber but the treatments, T1? ,Whole tuber+Ridomil dipping gave the highest yield numerically which exhibited delay on disease appearance, reduced foliage blight and increased yield significantly over control.

Keywords: Potato, Seed tuber, Phytophthora infestans, Ridomil mz 72, Acrobat mz

Location: Tuber Crops Research Centre, ARS, BARI, Bogra

Start Date: 00-00-1996

End Date: 00-00-1998

Program Area: Pest Management

Commodity: Diseases, Potato

Objectives:

To evaluate the performance of systemic fungicides as seed treatment against P. infestans and its effect on yield.

Methodology:

The present study was conducted at the Tuber Crops Research Centre, ARS, BARI, Bogra during 1996-97 and 1997-98 crop seasons with the potato variety cardinal. The tubers were used in two forms viz. whole tubers and cut tubers (one tuber cut into two equal halves). Two systemic fungicides namely Ridomil Mz-72 (Metalaxyl) @ 0.2% and Acrobat Mz (Dimethomorph) @ 0.2% were used in two forms: (i) dipping the tubers in fungicidal solution for twenty minutes and (ii) spraying on seed tubers, which were scheduled before 24 hours of planting. The experiment was laid out in randomized complete block design (RCBD) with three replications. The unit plot size was 3.0x3.0 m. Fertilizers and intercultural operations were done as recommended by Tuber Crop Research Centre, BARI. No fungicides were sprayed for foliar application in the crop. The total number of treatments were 10 including two control viz., T₁=Whole tuber+Ridomil Mz 72 dip., T₂=Whole tuber+Ridomil Mz 72 spray, T₃=Cut tuber+Ridomil Mz 72 dip., T₄=Cut tuber+Ridomil Mz 72 spray, T₅=Whole tuber+Acrobat Mz dip., T₆=Whole tuber+Acrobat Mz spray, T₇=Cut tuber+Acrobat Mz dip., T₈=Cut tuber+Acrobat Mz spray, T₉=Control (whole tuber) and T₁₀=Control (cut tuber). Data were recorded on first appearance of visible disease symptom, foliage infection (%) and yield (tha^-1). Foliage infection was recorded three times (60, 70 and 80 days after planting- DAP) at an interval of 10 days using 1-9 scale. Finally data were analyzed statistically using Duncan’s multiple range test (DMRT).

Source of Information: Pakistan Journal of Plant Pathology, 2(3): 157-160, 2003

Article Link (Online Journal): DOI: 10.3923/ppj.2003.157.160; URL: http://scialert.net/abstract/?doi=ppj.2003.157.160

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The treatment, Whole tuber+Ridomil dip. contributed 23.19 and 20.44% more yield compared to Control (cut tuber) respectively in 1996-97 and 1997-98 crop seasons. From the findings it appeared that amongst all the treatments, whole-Ridomil dip. reduced foliage infection and increased tuber yield significantly against control.

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