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Effect of Alternaria Blight on the Seed Yield of Cauliflower (brassica Oleracea L.)

M. SAKHAWAT HOSSAIN
Scientific Officer
Plant Pathology Division, Bangladesh Agricultural Research Institute (BARI), Gazipur, Bangladesh.

M. M. HOSSAIN
Senior Scientific Officer
Plant Pathology Division, Bangladesh Agricultural Research Institute (BARI), Gazipur, Bangladesh.

Abstract/ Executive Summary:

Effect of Alternaria blight (Alternaria brassiceae and A. brassicicola) on seed yield of cauliflower (Brassica oleracea L. var. botrytis) was studied during three consecutive growing seasons (2003-2004, 2004-2005, and 2005-2006) in winter under natural epiphytotic condition. There were two treatments viz. sprayed and unsprayed. BARI Cauliflower-1 was used as planting material and Rovral 50 WP (Iprodion) at 0.2% suspension was used as protective chemical to safe the crop against Alternaria brassiceae and A. brassicicola. Percent pod infection, pod area diseased, number of pods/plant and seed yield differed significantly between the sprayed and unsprayed (control) plots. Percent pod infection and pod area diseased ranged 35.3-62.4% and 94.7-97.6%, 1.9-2.2%, and 10.8- 16.4% in sprayed and unsprayed plots in different, respectively. The number of pod/plant was 462-592 in sprayed and 281-395 in unsprayed plots. The seed yield/ha ranged 249.4-355.1 kg in unsprayed plots and 456.8-677.0 kg in Rovral sprayed plots. The seed yield increase were 59.6%, 171.4%, and 75.2% in 2003- 2004, 2004-2005, and 2005-2006 cropping seasons, respectively.

Keywords: Alternaria blight, Seed yield, Cauliflower.

Location: Regional Agricultural Research Station (RARS), Jamalpur and BARI Farm, Joydebpur

Start Date: 00-00-2003

End Date: 00-00-2006

Program Area: Pest Management

Commodity: Diseases

Objectives:

An attempt was made to assess the effect of Alternaria blight on seed yield of BARI Cauliflower-1 under natural epiphytotic condition.

Methodology:

The experiment was conducted during the winter season of 2003-2004 and 2004- 2005 at Regional Agricultural Research Station (RARS), Jamalpur and during 2005-2006 winter seasons at BARI Farm, Joydebpur. Thirty days old seedlings of BARI Cauliflower-1 (Rupa) were transplanted on 1 November in 2 m × 1.2 m plots maintaining a spacing of 60 cm between lines and 50 cm between plants within a line. Ten seedlings were transplanted in each plot in two rows. The seedlings were watered immediately after transplanting and continued for 3 days to facilitate their establishment. Subsequently weeding, mulching, and irrigation were done as and when necessary. Aphid infestation was controlled by spraying Malathion 57 EC @1.5 ml/ L. Standard doses of fertilizers were also used (Satter et al., 2005). Rovral 50 WP (Iprodione), an effective fungicide against Alternaria blight of cauliflower (Ayub, 2001; Kodratikhoda et al., 2003) and cabbage (Hossain and Mian, 2004) was applied as foliar spray to control Alternaria blight. Out of 10 plots, five were selected randomly and plants were sprayed with Rovral at 0.2% concentration. Other five plots were sprayed with plain water (control). The fungicide was applied 5 times at 12 days interval beginning from the appearance of first visible symptoms of the disease and continued upto pod maturity. Five plants from each plot were randomly selected and tagged for data collection. When 70% pods of the plant showed the symptoms of maturity (partial yellowing) data on percent pod infection, percent pod area diseased and number of pods/plant was recorded. After harvest, the plants were sun dried and threshed manually. Seed yield/plot was recorded and seed yield/ha were calculated based on ‘per plot seed yield. Yield loss was computed according to Gupta and Singh (1981). Data were analyzed statistically using paired t-test.

Source of Information: Bangladesh J. Agril. Res. 35(3): 381-385, September 2010, ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Based on the finding of present result of the experiment, it may be concluded that Alternaria blight may cause about 47.8% reduction in yield of cauliflower seed. The loss can be avoided by spraying 0.2% Rovral 50 WP.

Knowledge Management: Journal