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Effect of Fungicides in Controlling Late Blight Disease and Yield of Potato for Late Plantation

S. R. Sarker
Plant pathology Division, BARI

A. K. Saha
Plant pathology Division, BARI

M.S. Hossain
Plant pathology Division, BARI

Abstract/ Executive Summary:

Five different fungicides Melody Duo @ 0.2%, Secure @ 0.1%, Acrobat MZ @ 0.2%, Ridomil @ 0.2% and Dithane M 45 @ 0.2%) and four combinations of fungicide Melody Duo @ 0.2% + Dithane M 45 @ 0.2%, Acrobat MZ @ 0.2% + Dithane M 45 @ 0.2%, Secure @ 0.1% + Dithane M 45 @ 0.2% and Ridomil @ 0.2% + Dithane M 45 @ 0.2% along with control were evaluated to assess the yield loss or gain for using fungicide starting from early growth stage of crop and to find out suitable fungicide(s) or combination of fungicides for effective management of late blight of potato for late plantation. Seeds of susceptible variety Diamant were planted on 15^th December 2014. Significantly the highest yield (52.32 t/ha) and least disease severity (3.00%) was recorded at 70 days after planting in Acrobat MZ @ 0.2% + Dithane M 45 @ 0.2% sprayed treatment. Acrobat MZ @ 0.2% was also the best of all individual fungicides.

Keywords: Dithane M-45, Potato, Late plantation, Late blight

Location: RARS, Burirhat, Rangpur

Start Date: 00-00-2014

End Date: 00-00-2015

Program Area: Pest Management

Commodity: Potato, Fungicide

Objectives:

To assess the yield loss or gain for using curative fungicide starting from early growth stage of crop and to find out suitable fungicide(s) for effective management of late blight of potato for late plantation

Methodology:

The experiment was conducted at RARS, Burirhat, Rangpur during Rabi season of 2014-15 following Randomized Complete Block Design (RCBD) having three replications. There were 10 treatments in this experiment. Five individual fungicides viz. Melody Duo @ 0.2%, Secure @ 0.1%, Acrobat MZ @ 0.2%, Ridomil @ 0.2%, Dithane M-45 @ 0.2%, four combinations of fungicide viz. Melody Duo @ 0.2% + Dithane M-45 @ 0.2%; Acrobat MZ @ 0.2% + Dithane M-45 @ 0.2%; Secure @ 0.1% + Dithane M-45 @ 0.2% ; Ridomil @ 0.2% +Dithane M-45 @ 0.2% and a control. The unit plot size was 3.0 m X 1.80 m with block to block distance 1.50 m and plot to plot distance within a block 1.0 m. The row to row spacing was 60 cm and seed to seed was 25 cm. So, each plot was ensured with three rows and twelve seeds in a row. Good quality seed tubers of susceptible variety Diamant were collected from Breeder’s Seed Production Center (BSPC), Bangladesh Agricultural Research Institute (BARI), Debiganj, Panchagarh. The seed tubers were planted on 15 December, 2014. The recommended fertilizer dose developed by Tuber Crops Research Center. Well decomposed cow dung @ 10 t ha^-1 and zinc sulphate @ 10 kg ha^-1 was spread to soil before opening of land. A split application of Urea i.e. ½ of the recommended and full doses of TSP, MoP, Gypsum, Magnesium sulphate and boric acid were applied as row placement besides 5-7 cm of the seed planting rows on either side. The remaining half of Urea was applied as side application at 35 DAP and followed by earthing up of soil by spade. Other agronomic practices were done properly. Fungicides spray was started after 30 DAP and continued up to 70 DAP. The spray interval was 10 days. During the time of spray thick polyester cloth was used as barrier surrounding the fungicide sprayed plots so that, fungicide could not move in non sprayed plots. Data on disease severity (% leaf area infected) was recorded at 10 days interval starting from 30 DAP. Yield i.e. tuber yield (t/ha) was also recorded and yield loss was assessed comparing with control. Data on different parameters were analyzed following computer package MSTAT-C and means were compared using Duncan’s Multiple Range Test (DMRT).

Source of Information: Annual Research Report, Plant pathology Division, BARI -- 2014-15

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

All tested fungicides and its combination significantly influenced disease severity and tuber yield over control. Although combinations of fungicides were more effective than individual fungicides; in case of yield there were no significant differences among the fungicidal treatments except Ridomil. However the highest yield (52.32 t/ha) was recorded from the combination of Acrobat MZ @ 0.2% + Dithane M-45 @ 0.2% followed by Secure @ 0.1% + Dithane M-45 @ 0.2% (50.72 t/ha). Out of five individual fungicides and four combinations Acrobat MZ @ 0.2% + Dithane M-45 @ 0.2% was the best for reducing disease. On the other hand, out of individual fungicides Acrobat MZ @ 0.2% performed the best for reducing disease and increasing yield. Ridomil @ 0.2% was the least performer of four tested fungicides

Knowledge Management: Report/Proceedings