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Effect of Plant Extracts on Okra Mosaic Virus Incidence and Yield Related Parameters of Okra

S.B. Bhyan
Department of Agricultural Chemistry, BAU, Mymensingh, Bangladesh

M.M. Alam
Department og Genetics & Plant Breeding, PSTU, Patuakhali, Bangladesh

M.S. Ali
Department of Agricultural Chemistry, BAU, Mymensingh, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted to find out the incidence of Okra mosaic virus (OMV) and its severity on yield and nutrition of okra under different phytopesticidal treatments. Four different plant extracts such as extracts of neem (Azadiracta indica) fruits, garlic (Allium sativum) bulbs, karamja (Pongamia pinnata) leaves and mehogoni (Swietenia macrophylla) seeds were considered as phytopesticidal treatments in this study. Plots with no phytopesticidal management were used as control. Highest rate incidence of okra mosaic virus was found in the plots with no phytopesticidal management. Though all the phytopesticides produced better performance than control, but karamja extract treated plants had minimal rate of incidence of this virus, with maximum plant height, flower production, fruits formation and highest yield.

Keywords: Incidence, Severity, Phytopesticides, Plant extracts, OMV, Okra

Location: Department of Agricultural Chemistry, BAU, Mymensingh

Start Date: 00-11-2005

End Date: 00-04-2006

Program Area: Pest Management

Commodity: Okra

Objectives:

The present study was undertaken to determine the influence of phytopesticides on the incidence of Okra mosaic virus and its severity on yield and yield related characters.

Methodology:

The study was conducted at the experimental field of the Department of Genetics and Plant Breeding and in the Laboratories of the Department of Agricultural Chemistry and Biochemistry, Bangladesh Agricultural University, Mymensingh during November, 2005 to April, 2006. The treatments used in the study were extracts of neem (Azadiracta indica) fruits, garlic (Allium sativum) bulbs, karamja (Pongamia pinnata) leaves and mehogoni (Swietenia macrophylla) seeds and control where no phytopesticides were applied. The field experiment was laid out in a randomized complete block design with four replications. Plant samples were ground in distilled water at 100 g L^-1 (10% concentration) in blender and filtered through double layered cheese cloths. Extracts were used immediately for spraying. First spray was done after 30 days of transplanting. The plant extracts were sprayed 3 times at 15 days interval. All exposed surface of the plants including leaves, buds, twigs, branches and fruits were sprayed. Control plots were sprayed with distilled water.

Data recorded on individual plant basis were taken from 10 randomly selected plants (5 healthy and 5 diseased) in each plot. Sampling was done at one stage of the plants. Virus infestation was examined carefully in the plants from top to bottom. The investigation of the experiment was made on percentage of infected plants plot^-1, percentage of leaf area infection, plant height, number of green fruits plant^-1, green fruit length, green fruit weight and yield plant^-1. Data were analyzed for ANOVA with the help of a computer package program of MSTAT. A two way ANOVA was made by F variance test. The pair comparisons were performed by Least Significant Difference (LSD) test at 5% level of probability. Regression line was prepared using MS Excel.

Source of Information: Asian Journal of Agricultural Research, 1: 112-118; ISSN 1918-1894

Article Link (Online Journal): DOI: 10.3923/ajar.2007.112.118

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It is to be concluded that under no phytopesticidal management virus incidence was highest causing a severe economic loss of yield and nutrition in okra plants. Besides, application of phytopesticides may be a mean of reducing OMV infestation and damage caused by it. The results also give importance on conducting similar works in future both in cellular and molecular levels to investigate the actual facts of the efficacy of phytopesticides against viral infection.

Knowledge Management: Journal