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Biological Control of Late Blight Caused by Phytophthora Infestans of Potato

I. Hossain
Professor
Plant Pathology Division Bangladesh Agricultural University, Mymensingh, Bangladesh

Dr. M. A. Kashem
Principal Scientific Officer
Plant Pathology Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202

Abstract/ Executive Summary:

An experiment was conducted in the field, 01-07-2009to control the late blight of potato using biological agents. The experiment was carried out following factorial Randomized Complete Block Design (RCBD) with four replications for each treatment. Biofungicide treated seed tubers resulted lower late blight incidence and severity followed by Bavistin. Late blight incidence and severity was higher in control. The number of stem as well as highest plant height were recorded where potato tubers were treated with BAU-Biofungicide followed by Bavistin than untreated control. Moreover, BAU-Biofungicide followed by Bavistin treated potatoes resulted good effect on formation of the highest number and weight of tuber than untreated control. The highest tuber yield (5.30 t/ha) was recorded in BAU-Biofungicide in case of Diamant variety of Grade B in cut tuber that resulted 65.63% higher over control.

Keywords: Biological control, Late blight, Phytophthora, Potato

Location: Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh, Bangladesh

Start Date: 01-11-2008

End Date: 01-07-2009

Program Area: Pest Management

Commodity: Diseases

Objectives:

To manage the seed tuber from seed borne as well as soil borne pathogens

Methodology:

The experiment was conducted in the Plant Pathology Field, Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh, Bangladesh during November, 2008 to March, 2009 under field condition and April, 2009 to July, 2009 under storage condition. Apparently healthy, mature and disease free potato tubers of the cultivars Diamant and Asterix were collected from Bangladesh Agriculture Development Corporation (BADC), Jamalpur. Some potato tubers were cut into pieces so that each piece can contains at least two sprouted buds. The selected land was first opened on November, 2008 with a power tiller. The land was then harrowed, ploughed, cross ploughed for five times with a power tiller followed by laddering to obtain a good final land preparation. The experiment was laid out in factorial Randomized Complete Block Design (RCBD) having four replications for each treatment. The unit plot size was 1m×1m. The space between the plots and blocks were 1m. There were three treatments viz.T₀= Control, T₁= BAU-Biofungicide (2% solution) and T₂= Bavistin (0.4% solution). Three factors:- 1. Varieties (Diamant and Asterix), 2. Grades of tuber (Grade A and Grade B) and 3. Size of tuber (cut tuber and whole tuber). Potato tubers were treated with BAU- Biofungicide and Bavistin by dipping the potato tubers (2% BAU-Biofungicide and 0.4% Bavistin solution). Control plot was planted with untreated tubers. The potato tubers were planted in rows at the spacing of plant to plant 40 cm and row to row 50 cm at the depth of 6 cm. After planting, fine soil mixture was used for covering the tubers. Earthing up was executed two times throughout the entire growing period, one at 30 days and another one at 40 days after planting. The plots were irrigated twice at 35 DAP and 45 DAP. Disease severity (1-9 scale) as suggested by Henfling (1979) was used. The following data were collected: disease severity, disease incidence, number of stem, plant height, number of tubers, weight of tubers and yield of tuber

Source of Information: life science journal 11(8):242-247, 2014

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The number of stem as well as highest plant height were recorded where potato tubers were treated with BAU-Biofungicide followed by Bavistin than untreated control. Moreover, BAU-Biofungicide followed by Bavistin treated potatoes resulted good effect on formation of the highest number and weight of tuber than untreated control. The highest tuber yield (5.30 t/ha) was recorded in BAU-Biofungicide in case of Diamant variety of Grade B in cut tuber that resulted 65.63% higher over control.

Knowledge Management: Journal