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Yield Loss of Potato Due to Late Blight Infection at Different Ages Under Inoculated Condition

T. K. Dey
Director
PRC, Ishurdi

M. Rahman
Scientific Officer
Plant Pathology Division RARS, Jamalpur

M. E. Rahman
Senior Scientific Officer
Plant Pathology Division BARI, Gazipur

A. Ayub
Chief Scientific Officer
Plant Pathology Division BARI, Gazipur

Abstract/ Executive Summary:

The experiment was conducted at TCRSC (Tuber Crops Research Sub Center), Bogra with potato cultivar, Diamant to determine the extent of loss due to late blight (Phytophthora infestaus) under inoculated condition at different ages of crop growth. It was found that the yield loss in directly related with age of plant infection. The yield loss is maximum (55.86%) when the crop attained 35 days old and extent of loss decreased gradually with increased crop age.

Keywords: YIELD LOSS, POTATO, LATE BLIGHT

Location: Bogra

Start Date:

End Date:

Program Area: Pest Management

Commodity: Potato

Objectives:

To determine the yield loss incurred by late blight infection, at different crop ages.

Methodology:

The experiment was conduced at TCRC sub station, Bogra, using the variety, Diamant. Unit plot size was 3.0 x 1.8m. Seed tubers were planted on Nov. 15 and 25; Dec. 05, 10 and 15, 2011. Paired plot design was followed with three replications Two treatments like Fungicide sprayed (Melody Duo -0.2%) and unsprayed were used. Inocula of P. infestans were inoculated in unsprayed plots on January 18, 2012 having 56-74 sporangia/microscopic field when the crop attained 65, 55, 45, 40 and 35 days. After inoculation polythene hood was made for ensuring abundant humidity for a period of 48 hours. Prior to inoculation experimental area was irrigated. Data were recorded on foliage infection and yield.

Source of Information: Plant Pathology Division, Annual Report 2011-12

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Trace infection of late blight was first initiated of TCRSC, Bogra on January 10, 2012 but in Bogra district it was noticed on January 02, 2012. Results revealed that the extent of damage (loss) depends on ages of plant infection. The infection at early stages of plant growth (35 days), healthy emerged leaves drastically damaged and loss incurred more than 55%. The extent of loss declined gradually with increasing plant age of the crop. The loss due to late blight under inoculated condition were estimated 9.50, 18.30, 37.30, 49.16 and 55.86% respectively, at 65, 55, 45, 40 and 35 days after planting .

Knowledge Management: Report/Proceedings