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Evaluation of Potato Late Blight Management Utilizing Host Plant Resistance and Frequency of Fungicide Application (2016 - 2017)

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 2016 – 2017 to observe the effect of spray frequencies of fungicide (Mancozeb) in controlling potato late blight disease and 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 more or less similar yield was obtained from all the frequencies.

Keywords: Potato, Late blight, Phytophthora infestans, Fungicides, Management

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

Start Date: 00-00-2016

End Date: 00-00-2017

Program Area: Pest Management

Commodity: Fungicide, Fungal Disease, Potato

Objectives:

The present experiment had been conducted to determine the effective spray frequency for managing the potato late blight disease

Methodology:

The experiment was conducted at RARS, Burirhat, Rangpur during the Rabi season of 2016 – 17. 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 and 4. Three Spray 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 2016-17, Plant Pathology Division, BARI, Gazipur

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Effect of variety and frequency of fungicide application on late blight severity and tuber yield are presented in the following table. It is revealed that 50 days after planting in the susceptible variety 50.00% infected leaf area was observed at zero sprays. At 7 days intervals and 10 days, interval disease severity was 1.00%. At 15 days interval, the disease severity was 2.00% and 20 DAP interval severity was 10.00%. In the case of both their resistant varieties at zero sprays, the disease severity was 5.00%. In the case of other spray frequencies, the % leaf area infection was within the range of 0.01%-2.00%. In the case of all varieties, the yields were decreased as the frequency of fungicide spray was decreased.

Knowledge Management: Report/Proceedings