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Incidence of Leaf Spot of Mustard in Akashmoni-mustard Based Agroforestry System

A.A.M. Syedur Rahman
Department of Agroforestry, Bangladesh Agricultural University, Mymensingh, Bangladesh.

Abstract/ Executive Summary:

The incidence of leaf spot of mustard (cv. BARI sharisha 13) grown in different orientations and distances under around twelve years old Akashmoni (Acacia auriculiformis) tree was studied in the field laboratory of the Department of Agroforestry, BAU, Mymensingh during 2004-05. The assessment result showed that the disease incidence was higher near the tree base in every side (1 m from the tree base) and higher in North side in all distances at different date of sowing. The lowest disease incidences were found in South orientations 3 m from the tree base and highest in North 1 m from the tree base. The siliqua infection significantly influenced on crop yield. The highest seed yield was observed in South orientation 3 m from the tree base and lowest in North 1 m from the tree base plot. The distance and orientation showed marked effect in disease development at different date after sowing. In open field condition (control) disease incidence also affect on yield and statistically different from tree-crop combination.

Keywords: Leaf Spot, Mustard, Akashmoni, Incidence, Orientations,

Location: Agroforestry field laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-00-2004

End Date: 00-00-2005

Program Area: Pest Management

Commodity: Mustard, Akash moni

Objectives:

To determine the incidence of leaf spot of mustard in Akashmoni-mustard Based Agroforestry System

Methodology:

The study was conducted during Rabi season of 2004-2005 in the Agroforestry field laboratory, Bangladesh Agricultural University, Mymensingh. The cultivar “BARI Sharisha 13 (Brassica napus) of mustard was used in the study. The experiment was carried out under 12-years old plantation of Akashmoni established by the Village Farm Forest Project (VFFP) area in the Agroforestry field laboratory. The experimental area covered 1500 m² including the borders and the open area for control plots. The experiment was used one row of trees involving trees of the Akashmoni species. The experiment was carried out by RCBD design with three replications. The two factors i.e., orientations and distances from the tree species involved in the study. The Orientations were O₁ = South, O₂ = West, O₃ = North and O₄ = East, and Distances from the tree base were D₁ = 1 m distance from the tree base, D₂ = 2 m distance from the tree base, D₃ = 3 m distance from the tree base and D₀ = (Open field) means-outside the tree canopy. The distance 1 m from the tree base was selected because farmers usually do not want to waste any land. So they cultivate all areas having about 1m around each tree (for 12-years-old tree). The size of each plot were 1x1m. The crown diameter of each of the three trees was measured along North-South and East-West axis using measuring tape. The dose of fertilizers and manures were applied in the field as recommended by BARI according to cultivation manual (Anonymous, 2004). Seed rate was 8 kg ha^-1. The seeds were sown in line. The line to line distance were 30 cm and placed at a depth of 2.5-3 cm. After sowing, the seeds were covered with soil. When germination was completed 50-60 plants were kept in each plot. Intercultural operations were done as needed. Data were recorded on % Plant infection,% Leaf infection,% Leaf Area Diseased (LAD),% Total siliqua infection,% Siliqua infection, No. of spots per siliqua, Plant height, No. of branches per plant, Weight of seeds per plant and Weight of seeds per plot.

Source of Information: Asian Journal of Plant Sciences Volume 5, Number 2, 193-196, 2006

Article Link (Online Journal): DOI: 10.3923/ajps.2006.193.196, URL: http://scialert.net/abstract/?doi=ajps.2006.193.196

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In mustard, siliqua infection and siliqua spotting in different orientation and distance from the tree base were statistically significant. Results of the study revealed that, Akashmoni trees had significant influence on Alternaria blight disease incidence as well as decreases yield in different distances and orientations.

Knowledge Management: Journal