SIMULATION OF A MODEL FOR DIAGNOSIS AND PRESCRIPTION FOR CUCUMBER MOSAIC DISEASE

Abstract

The Experiments were carried out during the period of 2009 to 2013 on the epidemiological status an :--,__ -=,",./ .., prescriptions used for the management of cucumber mosaic disease with a view to simulate a diagnosis and prescription model. The survey area covered five upazillas viz. Mymensingh sadar, Kushtia sadar, Kumarkhali, Chandina and Sher-e-Bangla Nagar under four districts viz, Mymensingh, Kushtia, Comilla and Dhaka where altogether 250 farmers field were considered for observation. The highest disease incidence of mosaic of cucumber (37, I%) was recorded at Kumarkhali, while the lowest were (33.9%) in Boira Keyotkhali, Gemini virus was detected as causal pathogen for cucumber mosaic disease. The model prescriptions issued by Plant Disease Diagnostic Clinic (PDDC) found effective in the farmer's field against the Cucumber Mosaic disease in selected locations were subjected to re-evaluation under different experimentations at Plant Pathological field laboratory at BAU farm. Economically affordable management practices were re-tested in five locations of Bangladesh. Based on the re-investigation results, the model prescriptions were finally selected for the vegetable growers of the country. Model diagnosis and prescription have been proposed. These were Surni-Alpha @ I mlfl sprayed 4 times at 15 days intervals starting from first sign of the disease at 60 days after sowing for cucumber mosaic disease. The management practices were reduced of disease incidence (73.5%), disease severity (73.8%), yield increased (74.4%) over control and benefit cost ratio (BCR) was 3.40, respectively.