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Foliar Spray of Fungicides to Control Alternaria Blight of Radish Seed Crop

M. Arifuzzaman
Department of Plant Pathology, Hajee Mohammad Danesh Science and Technology University Dinajpur-5200

M. M. Rashid
Department of Plant Pathology, Hajee Mohammad Danesh Science and Technology University Dinajpur-5200

M. S. Hasan
Department of Plant Pathology, Hajee Mohammad Danesh Science and Technology University Dinajpur-5200

M. S. Ferdousi
Department of Plant Pathology, Hajee Mohammad Danesh Science and Technology University Dinajpur-5200

Abstract/ Executive Summary:

An investigation was conducted in controlling the Alternaria blight of radish seed crop (var. Rocki) during the cropping season of 2005-06 at Thakurgaon District. The fungicides viz. Iprodione (0.2%), Mancozeb (0.3%) and Carbendazim (0.1%) were sprayed twice from first disease initiation with 15-d interval. Among the fungicides, Iprodione (0.2%) was found the most effective. Two sprays of Iprodione significantly reduced the leaf area diseased by 76.01% and pod area diseased by 81.87% over control. The 1000-seed weight (g), yield per plant (g) and yield (t/ha) were obtained significantly higher over control by 23.5%, 59.2% and 48.9%, respectively.

Keywords: Alternaria blight, Radish seed, Fungicides

Location: East-West Seed Bangladesh Limited Farm, Gorea, Thakurgaon District

Start Date: 00-00-2005

End Date: 00-00-2006

Program Area: Pest Management

Commodity: Fungicide, Radish

Objectives:

In Bangladesh, a number of chemicals have been evaluated against Alternaria brassicae in radish with varying degree of success (Ayub et al., 1996). But information on the control of Alternaria blight particularly on radish seed crop is limited in this country. Therefore, this investigation was undertaken to study the effect of some fungicides with suitable dosage in controlling Alternaria blight of radish seed crop.

Methodology:

The study was conducted at the East-West Seed Bangladesh Limited Farm, Gorea, Thakurgaon District in the cropping season 2005-2006 under field conditions. Radish var. Rocki (recently introduced from Japan) of East-West Seed Bd.Ltd. was used in this investigation. The land was prepared following the standard method. Root to seed method was employed. Seeds were sown in the bed (10m × 1m) on 5th November, 2005 at the spacing of 20cm × 20cm at the rate of 5 kg/ha. Forty days old stickling (syn. seedling) was uprooted and two-third of the upper portion was cutout and used as planting material. On 15th December, the stickling was transplanted in the main plot (3m × 3m each) at a spacing of (60 cm × 45 cm) having 30 plants in each plot. Three fungicides namely Iprodione 0.2% (Rovral 50 WP), Mancozeb 0.3% (Dithane M-45) and Carbendazim 0.1% (Shincar 50 WP) were used as foliar spray (Table 1). All fungicides were sprayed at the time of first disease expression up to two times at 15-day interval while the untreated (control) plots were sprayed with only plain water in the same manner. Experiment was set up in Randomized Complete Block Design with three replications. Ten plants from the central rows of each plot were randomly selected and tagged for recording data on leaf area diseased and pod area diseased by eye estimation (Islam et al., 2001). Leaf spot and pod spot severity was recorded at 59 and 80 days after transplanting, respectively. Data on leaf area diseased was taken from all leaves within thirty centimeters from soil level of the plant. Pod area diseased was taken from all pods bearing on three branches including the main rachis of seed stalk within 30 cm from the base. The crop was harvested at 100 days after transplanting and 1000- seed weight, yield per plant and yield (t/ha) were taken and calculated. Data were analyzed statistically. Mean separation of each treatment on different parameters was done by DMRT.

Source of Information: J. Sci. technol. (Dinajpur) Vol. 5: 140-143 (2007) ISSN 1994-0386

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It may be concluded that two sprays of Iprodione (0.2%) at an interval of 15 days may be recommended to control Alternaria blight of radish seed crop cv. Rocki to get significantly higher seed yield.

Knowledge Management: Journal