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Shoot-gall Disease of Mango and Its Control in Bangladesh

M. I. Zuberi
Associate Professor
Department of Botany, University of Rajshahl, Bangladesh.

Sish Muhammad
Associate Professor
Department of Botany, University of Rajshahl, Bangladesh.

Rakhahari Sarkar
Lecturer
Botany, University of Dhaka.

Abstract/ Executive Summary:

In a preliminary survey of shoot-gall disease of mango in Shibganj and Rajshahi, 75.4 per cent of the mango plants were found infested by the insect during 1981. The varieties Langra, Khirsapat and Ashina were much more affected (90 to 95 per cent) than Gopalbhog (71 per cent) but the variety Fazli was the least affected one (45 per cent). The frequency of occurrence of the shoot-galls was significantly higher in the twigs of the lower portion of the canopy than the upper portion. The number of galls (in lower branches) was higher in Langra and Gopalbhog (5.1 and 5 9 per twig) intermediate in Khirsapat and Ashina (3.9 and 3.4) and low in Fazli (0.4 per twig). The time of laying eggs, emergence of the nymphs and of the adults were found to differ from those reported in India; all these occured earlier in Bangladesh. The timing of application of insecticides for the control of the disease in the light of these finding was discussed.

Keywords: Shoot-gall, Disease, Mang, Bangladesh

Location: Shibganj of Chapai- Nawabganj, Rajshahi

Start Date: 00-03-1981

End Date: 00-09-1982

Program Area: Pest Management

Commodity: Mango

Objectives:

To the preliminary survey of shoot-gall disease of mango and its control in Shibganj and Rajshahi, Bangladesh.

Methodology:

The mango plants of four orchards situated in Shibganj of Chapai-Nawabganj, Rajshahi were examined on several occasions between March, 1981 and September, 1982. In addition, the mango orchard of B. A. R. I., Kazla, Rajshahi was also sampled on several occasions during the period. Plants were identified to the variety, labeled and were examined for the presence and number of galls. The number of shoot-galls present in a total of 30 twigs of each plant were counted; the leaf canopy of each plant was divided arbitrarily into the upper and the lower halves, and 15 of the 30 twigs were randomly selected from the lower half of the canopy whereas the other 15 belonged to the upper half. Random samples of shoot-galls were selected and dissected in the laboratory to count the number of nymphs present. Sampling of the galls was continued from September, 1981 to September, 1982. The time of emergence of the adults and their activity outside the galls were observed. Random samples of 15 leaves each from the upper and the lower portion of canopy were collected and the egg-spots on the leaves, if any, were noted.

Source of Information: Bangladesh Journal of Agriculture, Vol. 8 No.1-4, Jan.-Dec. 1983

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The timing of application of insecticides for the control of the disease in the light of these finding was discussed. The effectiveness of injecting the plants as a control measure against the shoot-galls insect was proved a total failure in most of the cases. Not only this, rotting of the stem around the spot of injection and eventual death of the affected branch has been reported.

Knowledge Management: Journal