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Determination of Spray Schedule for Fungicides in Controlling Purple Blotch of Onion

A. Ayub
Chief Scientific Officer
Plant Pathology Division, BARI, Gazipur

R. Islam
Scientific Officer
Plant Pathology Division, BARI, Gazipur

R. Momotaz
Scientific Officer
Plant Pathology Division, BARI, Gazipur

Abstract/ Executive Summary:

An experiment was conducted to develop a spray schedule in controlling purple blotch of onion at BARI, Gazipur during Rabi season, 2012-13. There were eight treatments. Significantly lower disease severity and higher yield were recorded where Score+Antracol+Score+Dithane M-45 were applied one after another.

Keywords: Fungicide, Purple blotch, Onion

Location: Joydebpur

Start Date: 00-00-2012

End Date: 00-00-2013

Program Area: Pest Management

Commodity: Fungicide

Objectives:

To select suitable spray schedule in controlling Purple Blotch of onion

Methodology:

The experiment was conducted in the field of Plant Pathology, BARI, Joydebpur, Gazipur, during winter 2012-2013 by using the seedlings of variety Taherpuri. Plot size was 2.8m x 2.10 m. There were eight treatments including control. The treatments were as follows: T₁=Rovral + Ridomil + Rovral + Ridomil, T₂=Rovral + Antracol + Rovral + Dithane M-45 T₃ = Score + Ridomil + Score + Ridmoil T₄=Score + Antracol + Score+ Dithane M-45 T₅=Rovral + Ridomil + Antracol + Dithane M-45 T₆=Rovral + Secure + Antrocol + Dithane M-45 T₇= Rovral + Bavistin + Rovral+ Bavistin. T₈=Control The experimental design was RCB with three replications. A total of four spays with different fungicides were done with 10 days interval beginning from the first appearance of the disease symptom. Data were taken on disease severity, bulb length, bulb diameter, bulb weight and plot yield. Data on disease rating were recorded from randomly selected 25 leaves from each plot. All the data analyzed for significance using MSTAT.

Source of Information: Annual Report 2012-13, BARI

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Results indicated that all the treatments significantly reduced the disease incidence. The highest percent disease index by 85.73 was recorded in control plots and the lowest PDI obtained by 36.80 T₄ treatments (Score + Anthracol + Score + Dithanem-45). The treatment T₄ was significantly differed from rest of the treatments except T₆ treatment in controlling purple blotch of onion. Length/bulb, Diameter/bulb, weight of 10 bulbs and yield under different treatments varied significantly. The highest Diameter/bulb (5.0cm) and weight of 10 bulb (524.6 g) were recorded in treatment T₄. Application of Score, Anthracol, Score and Dithanem M-45 offered higher yield by 9.47 kg and found to be similar to T₁, T₅and T₆ treatments. The lowest yield was harvested from untreated control plot by 6.50 kg.

Knowledge Management: Report/Proceedings