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Evaluation of Potato Late Blight Management Utilizing Host Plant Resistance and Frequency of Fungicide Application (2015 - 2016)

M. S. Hossain
RARS, Burirhat, Rangpur

Abstract/ Executive Summary:

An experiment was undertaken at Regional Agricultural Research Station, Burirhat, Rangpur during the rabi season of 2015 – 2016 to observe the effect of spray frequencies of fungicide (mancozeb) in controlling potato late blight disease and to establish an appropriate spray interval for resistant and susceptible potato variety. There were two resistant varieties namely BARI Alu-46 and BARI Alu-53 and a susceptible variety Diamant. Four spray frequencies of fungicide (Dithane M 45@ 0.2%) were 1. Seven sprays with 7 days intervals 2.Five sprays with 10 days intervals 3. Four sprays with 15 days intervals 4. Three sprays with 20 days intervals and one unsprayed plot were also maintained for each variety. From the results, it is revealed that disease severity was increased as the frequency of spraying decreased. In the case of yield higher yield was obtained from higher spray frequency but in the case of BARI Alu 46 statistically similar yield was obtained from all the frequencies.

Keywords: Potato, Late blight, Phytophthora infestans, Fungicides

Location: An experiment was undertaken at Regional Agricultural Research Station, Burirhat, Rangpur

Start Date: 00-00-2015

End Date: 00-00-2016

Program Area: Pest Management

Commodity: Fungal Disease, Fungicide, Potato

Objectives:

To observe the effect of spray frequencies of fungicide (mancozeb) in controlling potato late blight disease and to establish an appropriate spray interval for resistant and suscceptible potato variety

Methodology:

The experiment was conducted at RARS, Burirhat, Rangpur during the Rabi season of 2015 – 16. The design of the experiment was split plots with 3 replications. Block to block and plot to plot distance was 1.5 m and 1 m, respectively. Unit plot size was 2m x 1.8m having plant spacing 60 cm x 25 cm. There were 3 main plots where varieties were established. Two resistant varieties namely BARI Alu-46 and BARI Alu-53 and a susceptible variety Diamant were used in this experiment. In each main plot, there were five subplots. Four spray frequencies of Fungicide (Dithane M 45@ 0.2%) were 1. Seven sprays with 7 days intervals 2.Five sprays with 10 days intervals 3. Four sprays with 15 days intervals 4.Three Sprays with 20 days intervals and 5. One unsprayed plot was also maintained for each variety which was established in the subplots. Recommended fertilizer doses were applied and other agronomic practices were done properly. Fungicides spray was started after 30 DAP. During the time of spray thick polyester cloth was used as a barrier surrounding the fungicide sprayed plots so that, fungicide could not move in another plot. Data on disease severity (% leaf area infected) was recorded at 10 days intervals starting from 30 DAP to 90 DAP. Yield i.e. tuber yield (t/ha) was also recorded from the whole plot.

Source of Information: Annual Research Report 2015-16, Plant Pathology Division, BARI, Gazipur

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In this experiment, it was observed that the effectiveness of fungicides in reducing disease severity of both susceptible and resistant variety was varied with interval. In the case of 7 days interval, susceptible variety (Diamant) showed the lowest disease severity, statistically similar with resistant variety BARI alu 53.

Knowledge Management: Report/Proceedings