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Investigation Into Leaf Blight of Palas (butea Monosperma) and Its Control

M.S. Ullah
Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh -2202

M.R. Islam
Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh -2202

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

Q.Y Akther
Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh -2202

M.T. Islam
Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh -2202

G.M. M. Rahman
Department of Agroforestry, Bangladesh Agricultural University, Mymensingh -2202

Abstract/ Executive Summary:

Prevalence of leaf blight of palash trees was studied in different plantation areas under two selected major locations of the country during December 2007-April 2008. The disease varied with respect to plantation areas, types of plantations and age of the plants. All the plants of several locations were found severely infected by the disease. In general, mixed plantations of palash trees were found less affected by the disease followed by scattered and solid plantations. Similarly, older plants were severely infected compared to younger ones. Leaf blight symptoms observed on palash trees was characterized by small, irregular, light brown spot on the edge of the leaf blade of young leaves extending to 1/3rd portions of leaf blade. Colletotrichum gloeosporioides was consistently isolated from affected plant parts (leaves) which was subsequently confirmed as the cause of the disease through pathogenicity test. In vitro screening with fungicides and plant extracts showed that Rovral WP and Bavistin totally inhibited the mycelial growth of C. gloeosporioides at 2000 and 3000 ppm. Cupravit and Dithane M-45 also completely inhibited fungal growth at 3000 ppm. Plant extracts viz., Allium sativum and Azadirachta indica totally inhibited mycelial growth of C. gloeosporioides at 1:2 dilution ratio. Eucalyptus citriodora was also found effective at higher dilution.

Keywords: Leaf blight, Palash, Control, Colletotrichum gloeosporioides

Location: Different locations of Mymensingh and Narsingdi districts

Start Date: 00-12-2007

End Date: 00-04-2008

Program Area: Pest Management

Commodity: Diseases

Objectives:

1. To record the prevalence of the disease and to identify the cause of the disease along with the control measures.

Methodology:

Survey on the severity of leaf blight of palash: Survey was made at different plantation areas in different locations of Mymensingh and Narsingdi districts. During survey, occurrence of leaf blight disease and its intensity were recorded in 12 different plantation areas of which five located at the Bangladesh Agricultural University (BAU) Campus, Mymensingh; one at Brahmaputra bridge to Shambhugonj roadside areas, Mymensingh, three at Raipura, Narsingdi and three at Belabo areas, Narsingdi. The details of major locations, sub-locations and individual plantation areas, and number of plants surveyed. During survey, variation in the prevalence of leaf blight as affected by the types of plantation was also recorded. For this purpose three types of plantations were selected such as (i) solid plantation of palash trees-where exclusively palash is grown (ii) mixed plantation of palash with Mahogoni, Jackfruti, Acacia, Mango, Citrus, Guava etc. and (iii) Scattered plantation of palash where palash trees are grown in scattered fashion having no other species in the close vicinity were considered. For the survey of leaf blight prevalence in solid, mixed and scattered plantation areas, a total of 19 individual plantation areas were selected. Three age groups such as 1- 6 years, 7-15 years and above 15 years were considered to findout relationship between disease severity and age of plants. Collection, isolation, purification and identification of causal organisms: Diseased leaves were collected from the infected plants representing the different areas of survey Isolation of causal organism was done by tissue planting method. The fungi which grew out of the inocula were transferred to fresh culture plates from where sub-cultures were made into PDA plates by hyphal tip method. The fungus was identified by observing colony characters, linear growth, colour and sporulation. Comparative efficacies of four fungicides viz Rovral WP, Cupravit, Bavistin and Dithane M-45 against leaf blight pathogen were determined in the laboratory. In vitro evaluation of plant extracts: Six plant samples viz Tagetes erecta, Zigniber officinale, Azadirachta indica, A. Cathertica, Eucalyptus citriodora, Allium sativum, were collected from different areas of Bangladesh Agricultural University Campus which were used in this study against Colletotrichum gloeosporioides.

Source of Information: J. Agrofor. Environ. 3 (1): 111-114, 2009; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

No report on controlling leaf blight of polash was available in the country. But in-vitro screening of fungicides against C. gloeosporioides showed that Rovral WP, Topsin-M, Cupravit and Bavistin successfully controlled the fungus

Knowledge Management: Journal