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Effect of Date of Sowing on Purple Blotch Disease of Onion

A.Ayub
CSO
Plant Pathology Division, BARI, Gazipur

Abstract/ Executive Summary:

The highest disease severity (Percent disease index (PDI) and spot diameter) were recorded from January, 10 planting. Yield contributing characters (plant height, length and breadth of bulb) was also better in December planting (December 10, 20 and 30) than January planting. Significantly the highest bulb yield was obtained from December 10 and 20 planting and the lowest from January 10 Planting.

Keywords: Date of Sowing, Purple Blotch Disease, Onion

Location: BARI, Gazipur

Start Date: 00-00-2005

End Date: 00-00-2006

Program Area: Pest Management

Commodity: Onion

Objectives:

To avoid the use of chemical fungicides and to save our environment.

Methodology:

The experiment was conducted at Plant Pathology Division, BARI, Gazipur during 2005-2006. Seedlings of Taherpuri variety were planted on four different dates at 10 days interval starting from Dec. 10, 2005. The seedlings were planted in 2.0 m x 1.5 m plots at 30 cm line to line and 10 cm plant to plant distance. Design was randomized complete block (RCBD) with three replications. Disease data was recorded according to 0-5 scale, where 0= no disease, 1= a few spot towards the tip, covering 10% area, 2= several dark, purplish brown patches covering more than 10% - 25% leaf area, 3= several patches with pale outer zone covering more than 25% - 45% leaf area, 4= long streaks covering more than 45% - 75% leaf area and/ or breaking leaves and 5 complete drying or breaking of the leaves from the base. Spot diameter, Plant height, length and breadth of bulb, weight / bulb and b yield/ plot were recorded. Per hectare bulb yield were computed based on per plot yield. Data were analyzed for analysis of variance. Data on percent disease index (PDI) were calculated.

Source of Information: Annual report 2005-06,Plant Pathology Division, BARI, Gazipur

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The lowest and the highest disease severity (Percent disease index (PDI) and spot diameter) were recorded from December, 10 planting and January, 10 planting, respectively. However, the disease severity in December 10, 20 and 30 planting was statistically similar. Yield contributing characters (plant height, length and breadth of bulb) was also better in December planting (December 10, 20 and 30) than January planting. Significantly the highest bulb yield was obtained from December 10 and 20 planting and the lowest from January 10 Planting. From the results it may be stated that December 10 to 20 is the best time of transplanting of onion to avoid the purple blotch disease and to get maximum bulb production.

Knowledge Management: Report/Proceedings