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Pathogenicity of Phytophthora Capsici and Possibilities of Its Biological and Chemical Control

M. K. Akter
Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh- 2202, Bangladesh

M. D. Hossain
Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh- 2202, Bangladesh

K. Nahar
Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh- 2202, Bangladesh

M. B. Meah
Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh- 2202, Bangladesh

M. A. Hossain
Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh- 2202, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted at the laboratory of the Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh during the period of January to April 2006 on the pathogenicity of Phytophthora capsici, collar and root rot pathogen of chilli and its in vitro control using fungicides and plant extracts. P. capsici was found to be pathogenic in seedlings of brinjal, tomato, cucumber, white gourd, water melon, ribbed gourd, snake gourd, dhundol, khira and bangi except dhundol. The efficacy of four fungicides i.e. Ridomil, Acrobat MZ, Macuprax and Dithane M 45 each with 2 different concentrations (0.1% and 0.2%) and plant extracts viz. Alamanda and Garlic with 3 different dilutions of 1:2, 1:3 and 1:4 were evaluated for control of mycelial growth of the organism Phytophthora capsici in vitro condition. All the different concentrations of fungicides and all the dilutions of plant extracts significantly controlled the mycelial growth of P. capsici.

Keywords: Phytophthora, Collar rot, Root rot, Pathogenicity, Biological, Chemical control

Location: The laboratory of plant pathology, Department of Plant Pathology

Start Date: 00-01-2006

End Date: 00-04-2006

Program Area: Pest Management

Commodity: Diseases

Objectives:

1. To determine host range or pathogenicity of P. capsici and evaluating its control by using different chemicals and plant extracts in vitro.

Methodology:

Pathogenicity study of P. capsici and its possibility of biological and chemical control was conducted in the laboratory of plant pathology during the month of January to April, 2006. Four fungicides (Acrobat MZ, Ridomil, Macuprax and Dithane M-45) each with 2 different concentrations were used in this study. Concentrations of 0.2% and 0.1% of Acrobat MZ and Ridomil were used while for Macuprax and Dithane M-45, 0.5% and 0.25% concentration were used. A total of 8 fungicidal treatments with above mentioned concentrations were prepared with 3 replicates on the basis of active ingredients they contained. To prepare each fungicidal suspension of specific concentration, the required amount of fungicides were kept in the conical flask prior to mixing with sterilized water.The pathogenicity of the isolated P. capsici was tested on tomato, brinjal, cucumber, snake gourd, white gourd, sweet gourd, watermelon, ribbed gourd, dhundol, khira and bangi fruits and their seedlings, respectively. These fruits were collected from the local market. Seedlings of tomato, brinjal, cucumber, snake gourd, white gourd, sweet gourd, watermelon, ribbed gourd, dhundol, khira and bangi were grown on small plastic pots filled with sterile soil in green house. Ten healthy seedlings of each fruit type were kept to grow on. Watering and necessary care after germination were taken through out the experimental period. At the age of 1 month, the seedlings of each fruit type were inoculated with fungal block of P. capsici (4 mm diameters) at the base of the each seedling and observation was made for 7 days post inoculation. Control seedlings were kept non-inoculated with fungal block. Wilted and collar rotted seedlings were counted from each pot. In case of fruit, collected fruits were pricked with a sterile cork borer and fungicidal solutions were injected in the pricked point of the fruits. Then inocula blocks of mycelia ofc P. apsici (4 mm diameter prepared from 7 days culture) were placed on the pricked skin of the fruits. The inocula treated fruits were kept wrapping with brown paper for the incubation of the pathogen and appearance of the disease symptoms. Observation was made for about 5 days.Fruits,which were inoculated but administered no chemicals served as control.

Source of Information: J. Agrofor. Environ. 1(2): 81-84, 2007; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The efficacy of four fungicides i.e. Ridomil, Acrobat MZ, Macuprax and Dithane M 45 each with 2 different concentrations (0.1% and 0.2%) and plant extracts viz. Alamanda and Garlic with 3 different dilutions of 1:2, 1:3 and 1:4 were evaluated for control of mycelial growth of the organism Phytophthora capsici in vitro condition. All the different concentrations of fungicides and all the dilutions of plant extracts significantly controlled the mycelial growth of P. capsici.

Knowledge Management: Journal