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Effect of Fungicides in Controlling Alternaria Blight of Cumin

K. M. Khalequzzaman
Plant Pathology Division, BARI

M. A. Wadud
Plant Pathology Division, BARI

M. M. Hasan
Plant Pathology Division, BARI

Abstract/ Executive Summary:

The experiment was conducted at Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh during 2014-15 to find out the effective fungicides in controlling Alternaria blight of cumin. Four fungicides viz. Rovral 50 WP @0.2%, Companion @0.2%, Secure 600 W @0.15%, Sunvit 50 WP @0.5% and one control were used as treatment. Cumin line CN 026 was used in this experiment. Three fungicides reduced disease significantly over control. Alternaria blight ranged from 14.40 - 90.81%, while the lowest severity was recorded in Rovral 50 WP (0.2%) sprayed plots and the highest severity was recorded in control treatment. Rovral 50 WP (0.2%) gave the highest number of umbels/plant, number of umbel lets/plant, number of seeds/umbel, number of seeds/plant, weight of seeds/plant and seed yield (675.0 kg/ha) which was followed by Companion and Secure 600 W. Sunvit and control treatment did not produce any seeds.

Keywords: Cumin, Alternaria blight, Fungicide

Location: Spices Research Centre, BARI, Shibganj, Bogra,

Start Date: 00-00-2014

End Date: 00-00-2015

Program Area: Pest Management

Commodity: Cumin, Fungicide

Objectives:

The present study was undertaken to find out the effective fungicides in controlling Alternaria blight of cumin.

Methodology:

The experiment was conducted at Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh during Rabi season of 2014-15 to find out the effective fungicides in controlling Alternaria blight of cumin. The experimental plot was prepared with five ploughing and cross ploughings followed by laddering to break the clods as well as level the soil. The weeds and stubble of previous crops were collected and removed from the soil. Cowdung 5 t/ha, N @ 70 kg/ha, P @ 25 kg/ha and K @ 50 kg/ha were applied. The entire quantity of cowdung, P and K were applied during final land preparation. Nitrogen was applied in two equal splits one at 20 days after germination and the other half at flowering stage followed by irrigation. The experiment was carried out following Randomized Complete Block Design with three replications. Size of the plots was 3.0 m × 1.2 m and plant spacing was 30 cm × continuous sowing. Cumin line CN 026 was used in the experiment. Four fungicides and one control were used as treatment. The treatments were T₁=Rovral 50 WP (Iprodion) @0.2%, T₂=Companion (Carbendazim + Mancozeb) @0.2%, T₃=Secure 600 WG (Fenamidone + Mancozeb) @0.15%, T₄=Sunvit 50 WP (Copper Oxichloride) @0.5%, and T₆=Control (untreated). The fungicides were sprayed 7 times at an interval of 7 days from disease initiation (pre-flowering stage). Seeds were sown on November 18, 2014. Five weeding were done at 15, 30, 45, 60 and 75 days after emergence and five irrigation were also applied just after five days of each weeding. Other intercultural operations were done to maintain the normal hygienic condition of crop in the field. Bavistin DF (0.2%) was sprayed at plant base at soil level five times at an interval of 10 days from seedling stage to control wilt of cumin. The plots were inspected regularly to take observations on blight disease from seedling to maturity stage of the crop. Disease plant parts were collected in laboratory for identifying blight causal pathogens. The crop was harvested from March 26-31, 2015. Data were recorded on blight, number of primary branches/plant, plant height at harvest, number of umbels/plant, number of umbel lets/plant, number of seeds/umbel, number of seeds/plant, weight of seeds/plant and seed yield (kg/ha). Percentage data were converted to angular or arcsign transformation. The recorded all data were analyzed statistically to find out the level of significance and the variations among the respective data were compared following Duncan’s New Multiple Range Test.

Source of Information: Annual Research Report, Plant Pathology Division, BARI--2014-15

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Alternaria blight severity was significantly influenced by the treatments. Alternaria blight severity ranged from 14.40 - 90.81%, while the lowest severity was recorded in Rovral (0.2%) sprayed plots which was statically similar to Companion (0.2%) by 19.95%, and the highest severity was recorded in control treatment which was not statistically similar to any other treatments. The highest disease reduction over control (84.14%) was obtained from Rovral 50 WP (0.2%) sprayed plot which was followed by Companion (0.2%) and Secure 600 W (0.15%), and the lowest (20.17%) was obtained from Sunvit sprayed plots. Fungicides did not show any statistical effect on number of primary branches/plant. Primary branches of cumin were more or less same (4.2-4.5) among the treatments. Significantly the tallest plants (39.10 cm) at harvest were recorded in Secure (0.15%) sprayed plots and the smallest (30.42 cm) plants were recorded in control plots. Number of umbels/plant, number of umbel lets/plant, number of seeds/umbel, number of seeds/plant and weight of seeds/plant were significantly affected by the fungicides. The highest number of umbels/plant (64.61) was obtained from Rovral (0.2%) sprayed plot which was statistically at par with Companion (59.12) and Secure (55.52) sprayed plots and the lowest number (22.08) was obtained from control treatment. Rovral (0.2%) sprayed plots resulted the highest number of umbel lets/plant (177.33) which was followed by Companion (138.33) and Secure (106.77). Number of seeds/umbel varied form 28.37 - 40.16, where the highest was recorded in Rovral (0.2%) and the lowest (28.37) was recorded in Secure (0.15%) sprayed plots, but Sunvit and control treatment did not produce any seeds/umbel. Rovral sprayed plots showed the highest number of seeds/plant (395.15) and weight of seeds/plant (1.96 g) which was followed by Companion (0.2%) and Secure (0.15%), but Sunvit (0.5%) and control treatment did not produce any seeds/plant. Significantly the highest seed yield (675.0 kg/ha) was recorded in Rovral 50 WP sprayed plots which was followed by Companion (638.9 kg/ha) and Secure (557.4 kg/ha). Sunvit and control treatment did not produce any seeds. It may be concluded that foliar spraying with Rovral 50 WP (0.2%) or Companion (0.2%) 7 times at an interval of 7 days from disease initiation (pre-flowering stage) decreased Alternaria blight and increased seed yield of Cumin.

Knowledge Management: Report/Proceedings