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Identification of Causal Agent of Gummosis and Sudden Decline of Mango Plants and Its Management

M. M. Hossain
Senior Scientific Officer
Regional Horticulture Research Station,BARI, Chapai Nawabgan

M.A. Wadud
Scientific Officer
Regional Horticulture Research Station,BARI, Chapai Nawabgan

Abstract/ Executive Summary:

An investigation was conducted in and around Regional Horticulture Research Station, Chapai Nawabganj on the incidence of gummosis and sudden decline of mango yield which creates a threat to the mango industry. Lasiodiplodia theobromae was isolated from the infected tissues. Bavistin (Carbendazim) and Tilt (Propiconazole) were not effective to control the disease in the field. Removal of the bark of the point of gum exudation with some healthy portion at the initial stage of infection and application of Bordeaux paste (100g CuSO₄ + 100g Lime + 1000ml water) 3-4 times at an interval of 10 days could protect the mango trees from the disease.

Keywords: Mango, Gumosis disease, Management

Location: Regional Horticulture Research Station and also some farmers field of Chapai Nawabgan

Start Date:

End Date:

Program Area: Pest Management

Commodity: Mango

Objectives:

To find out the causal pathogen(s) of gummosis and sudden decline of mango yield and its possible control measure

Methodology:

Mango tree infected with the gummosis were studied at Regional Horticulture Research Station and farmers field of Chapai Nawabganj and Rajshahi districts. Disease sample were collected from the infected plant and suspected causal pathogens were isolated in the laboratory through tissue plating methods on potato dextrose agar (PDA). The isolated pathogen was purified through hyphal tip culture method (Mian 1995). Pathogenecity test was carried out on three year old mango grafts. First a cut made on the bark with a knife and small, shallow wounds were made on the bark of stem. After wounding a mycelium block placed on wound portion and covered by parafilm. Control stem were treated without inoculums. Application of fungicides Two systemic fungicides viz Bavistin (Carbendazim) and Tilt (Propiconazole) were sprayed to the infected plants. Fungicides were applied both at the base and vegetative part of the plant. The dose of Bavistin was 2g/l for the canopy and 4g/l for the base similarly Tilt was 1ml/litre and 2ml/litre, respectively. In case of basal application a circular ditch was made 2.5 meters away from the base of the trunk then the fungicides were applied into the ditch at 10 days interval. Besides this mixtures of these two fungicides were also applied by injection method. Application of Bordeaux paste At the initial stage of infection (when gum exudates from 2-3 points) the point of exudation was cleaned with a sharp knife and Bordeaux paste was applied on the cleaned area with a brush. The paste was applied 3-4 times at an interval of 10 days. Same procedure was followed in case of medium infected trees. Application of fresh cow dung paste Similar procedure was followed in case of cow dung paste application

Source of Information: Annual Report 2010-11, BARI

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Lasiodiplodia theobromae was isolated more frequently from the tissue where gum was exudates. Sometime other pathogens were obtained from the infected tissues which were unidentified. Reaction to the fungicides Bavistin and tilt was applied separately at the base as well as foliage and at inject the mixture of these two near the gumming point of the infected plant. The fungicides were applied at every 10 days. None of the fungicides used in this investigation was able to protect the plant from gum secretion of decline. However, both of them delayed death of the plant. The application of Bordeaux paste had significant effect on the development of the disease. In case of initial and medium infection application of Bordeaux paste successfully prevented the disease development of the young plants. But Bordeaux paste was not able to prevent disease development if the plant become old and medium affected. The application of fresh cow dung paste had no significant effect on the development of the disease.

Knowledge Management: Report/Proceedings