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Management of Alternaria Leaf and Umbel Blight of Dill

K. M. Khalequzzaman
Principal Scientific Officer
Spices Research Centre, BARI, Shibganj, Bogura, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted at Spices Research Centre, BARI, Shibganj, Bogura, Bangladesh during Rabi season of 2018-19 to find out the effective fungicides in controlling Alternaria leaf and umbel blight of BARI Sholuk 1 of Dill. Seven fungicides and one control were used as treatment. Alternaria leaf and umbel blight incidence of Dill under different treatments varied from 9.33-90.33%, while the lowest incidence was recorded in seed treatment and foliar spraying with Amistar Top 325 SC (0.1%) which was statistically similar to seed treatment and foliar spraying with Rovral 50 WP (0.2%) and Secure 600 WG (0.15%), and the highest incidence was obtained in control plot. Seed treatment and foliar spraying of Amistar Top 325 SC (0.1%) exhibited the highest number of seeds/plant (1811.43), weight of seeds/plant (18.37 g) and seed yield (1.98 t/ha) and the lowest was observed in control plots. So, farmers and researchers can be used Amistar Top 325 SC (0.1%) or Secure 600 WG (0.15%) or Rovral 50 WP (0.2%) to reduce Alternaria leaf and umbel blight and increased seed yield of Dill.

Keywords: Secure, Amistar Top, Rovral, Alternaria, Blight, Dill

Location: Spices Research Centre, BARI, Shibganj, Bogura, Bangladesh

Start Date: 01-11-2018

End Date: 30-04-2019

Program Area: Pest Management

Commodity: Fungal Disease, Dill

Objectives:

To find out the effective fungicides in controlling Alternaria leaf and umbel blight of Dill.

Methodology:

The experiment was conducted at Spices Research Centre, BARI, Shibganj, Bogura, Bangladesh during Rabi season of 2018-19. The experimental plot was prepared with five ploughing and cross ploughing followed by laddering to break the clods as well as level the soil. The weeds and stubbles of previous crops were collected and removed from the soil. Cowdung @5 t/ha, N @100 kg/ha, P @60 kg/ha, K @100 kg/ha and S @20 kg/ha were applied. The entire quantity of cowdung, P and K was applied during final land preparation. Nitrogen was applied in two equal splits one half at 20 days after germination and the other half at flowering stage followed by irrigation. The experiment was carried out in Randomized Complete Block Design with three replications. Size of the unit plot was 2.5 m × 1.6 m and plant spacing was 40 cm × 10 cm. BARI Sholuk 1 was used in this experiment. Seven fungicides and one control were used as treatment. The treatments were T₁= Seed treatment and foliar spraying with Rovral 50 WP (Iprodion) @0.2%, T₂= Seed treatment and foliar spraying with Extramil 720 WP (8% Cymoxanil + 64% Mencozeb) @0.2%, T₃= Seed treatment and foliar spraying with Folicur 250 EC (Tebuconazole) @0.1%, T₄= Seed treatment and foliar spraying with Secure 600 WG (Fenamidone + Mancozeb) @0.15%, T₅= Seed treatment and foliar spraying with Ridomil Gold (Metalaxyl + Mancozeb) @0.2%, T₆= Seed treatment and foliar spraying with Timsen TM (N-alkyle dimethyle benzyl ammonium chloride 40%+ Stabilized Urea 60%) @0.1%, T₇= Seed treatment and foliar spraying with Amistar Top 325 SC (Azoxystrobin + Difenoconazole) @0.1% and T₈= Control (Untreated). The fungicides were sprayed five times at an interval of 7 days after the emergence of disease. Seeds were sown on November 8, 2018. Three weeding were done at 25, 50, and 75 days after emergence and three 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. Autostin (0.2%) was sprayed at plant base with soil level four times at an interval of 7 days from seedling stage to control wilt of Dill. The plots were inspected regularly to observe instead of take observations on blight disease from seedling to maturity stage of the crop. Disease plant parts were collected and brought in the laboratory for identifying blight causal pathogens. Alternaria brassicicola was isolated from infected leaf and umbel of plant. The crop was harvested from April 7-11, 2019. Data were recorded on Alternaria leaf and umbel blight (%), number of primary and secondary branches per plant, plant height at harvest, number of umbels per plant, number of umbel lets per umbel, number of umbel lets per plant, number of seeds per umbel, weight of seeds per umbel, number of seeds per plant, weight of seeds per plant and seed yield. The recorded data were analyzed statistically following Duncan’s Multiple Range Test (DMRT) according to Gomez and Gomez (1984).

Source of Information: Nippon Journal of Environmental Science, 1(4): 1011 (1-7), 2020

Article Link (Online Journal): https://www.nipponpub.com/wp-content/uploads/2020/07/NJES-1011.pdf

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Seed treatment and five times foliar spraying of Secure 600 WG (0.15%) and Seed treatment and five times foliar spraying with Rovral 50 WP (0.2%) and Seed treatment and five times foliar spraying of Amistar Top 325 SC (0.1%) at interval 7 days significantly individually decreased Alternaria leaf and umbel blight and increased seed yield of Dill. So, farmers and researchers may use Amistar Top 325 SC (0.1%) or Secure 600 WG (0.15%) or Rovral 50 WP (0.2%) in reducing instead of to decrease Alternaria leaf and umbel blight and increased seed yield.

Knowledge Management: Journal