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Development of Alternaria Blight in Some Advanced Mutants of Brassica Napus Under Field Conditions

M. Jalaluddin
Plant Pathology Division, Bangladesh Institute of Nuclear Agriculture, P.O. Box 4, Mymensingh 2200, Bangladesh

M. A. Kashem
Plant Pathology Division, Bangladesh Institute of Nuclear Agriculture, P.O. Box 4, Mymensingh 2200, Bangladesh

Abstract/ Executive Summary:

The natural development of Alternaria blight caused by Alternaria brassicae (Bent) Sacc. on three advanced induced mutants of Brassica napus (Mut. 19, Mut. 36 and Mut. 43) along with their mother variety, Nap-3 was studied under field conditions during winter seasons of 1994-95 and 1995-96. The number of lesions that caused severe blights on leaves and pods and leaf defoliation increased significantly with advanced stages of crop growth. The pattern of development and the rate of progress of disease were almost similar in all the tested materials. Severe Alternaria blight development was initiated 40 days after sprouting which may be considered as critical stage of development of the disease in the field. To avoid yield loss fungicidal spray programme should be initiated during this critical stage of disease development. All the induced mutants produced higher seed yield than their mother variety, Nap-3. However, the induced mutant-43 produced the highest seed yield (191.4g/m²) followed by mutant-19 in both the growing seasons.

Keywords: Alternaria blight, Mutants of Brassica napus, Yield, Field conditions

Location: Bangladesh Institute of Nuclear Agriculture farm, Mymensingh and its substation farms at Jamalpur and Ishurdi

Start Date: 00-00-1994

End Date: 00-00-1996

Program Area: Pest Management

Commodity: Diseases

Objectives:

To identify the critical stage of development of the disease in the field in order to suggest for economic management practices
To increase seed quality and yield in rapeseed mutants of Brassica napus.

Methodology:

The experiments were conducted in randomized complete block design with four replications at the Bangladesh Institute of Nuclear Agriculture farm, Mymensingh and its substation farms at Jamalpur and Ishurdi during the winter seasons of 1994- 95 and 1995-96. The development of Alternaria blight on the three advanced mutants (viz. Mut. 19, Mut. 36 and Mut. 43) of the Brassica napus along with their mother variety Nap-3 were studied under field conditions. The unit plot size was 5m x 5m. The seeds were sown in continuous rows with spacing 20 cm apart. The complete doses of fertilizers were applied @ 90kgN, 80kg P₂0₅, 40kg K₂0 and 40kgS ha-1 (Das and Rahman, 1994). Intercultural operations were done when required. The development of Alternaria blight on leaves and pods and the percent leaf defoliation/plant at various stages of plant growth were recorded in all the three locations. After initiation of the disease, the severity was recorded on 15 randomly selected rapeseed plants from each plot. The severity on leaves was assessed 20, 40. 60 and 80 days after sprouting and on pods 40, 60 and 85 days after sprouting. The severity was recorded by counting the number of lesions per leaf and the percent blighted areas on leaves and pods. The crops of each year were harvested at full maturity. Seed yield from 1m²plots was recorded for each tested material. The combined analyses were done among the different locations. Analyses of variance of different parameters for disease development at different growth stages and location during 1994-95 and 1995-96 were made.

Source of Information: Bangladesh J. Nuclear Agric. 14: 71-76,1998 , ISSN 0258-7130

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

All the induced mutants produced higher seed yield than their mother variety, Nap-3. However, the induced mutant-43 produced the highest seed yield (191.4g/m²) followed by mutant-19 in both the growing seasons. Severe Alternaria blight development was initiated 40 days after sprouting which may be considered as critical stage of development of the disease in the field.

Knowledge Management: Journal