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Efficacy of Fungicides to Control Stemphylium Blight (stemphylium Botryosum) of Lentil

M. Shahiduzzaman
Scientific Officer
Regional Pulses Research Station, BARI, Madaripur.

N. D. Kundu
Scientific Officer
RARS, Rahmatpur, Barisal.

M. Abul Hossain
Chief Scientific Officer
Regional Pulses Research Station, BARI, Madaripur.

Abstract/ Executive Summary:

A field experiment was carried out during Rabi seasons of 2011-12 and 2012-13 to evaluate the efficacy of fungicides in controlling Stemphylium blight (5. botryosum) of lentil Five fungicides were evaluated under higher disease pressure (106 ml^-1) of Stemphylium blight. Results revealed that Foliar spray (4 sequences) with Rovral SOWP (Iprodione) @ (0.2%) and Secure 600WG (Fenamidione--Mancozeb) @ (0.2%) at an interval of 7 days effectively controlled the disease and increased yield of lentil by 31.99% and 28.20%, respectively. The fungicides may be selected for control of the disease.

Keywords: Efficacy, Stemphylium blight, Fungicide, Lentil.

Location: Regional Pulses Research Station, BARI, Madaripur

Start Date: 00-00-2011

End Date: 00-00-2013

Program Area: Pest Management

Commodity: Lentil

Objectives:

To test five fungicides to control Stemphylium blight of lentil.

Methodology:

The fungicides tested in the present experiment were Rovral 50WP (Iprodione), Secure 600 WG (Fenamidione+Mancozeb), Companion, lndofil-45 (Mancozeb) and Nativo 75WG (Tebuconazole-s Trifloxystobin). All fungicides were applied as foliar spray at 0.2% suspension in plain water. The experiment was laid out in randomized complete block design with three replications. The unit plot size was 3 m x 4 m. Seeds of lentil variety BARl Masur-I susceptible to Stemphylium blight were sown in continuous rows maintaining of 30 cm x 5 cm row to row spacing on 23 November, 2011 and 19 November, 2012. Intercultural operations were done whenever necessary. The experiment was visited regularly to observe the onset of the disease. Spraying of fungicides was started when the disease appeared on the crop. Four sprays were applied on 8, 15, 22 and 27 January, 2012 and 3,10,17 and 24 January, 2013. Data on severity of Stemphylium blight disease were recorded on 18, 25 and 30 January in 2012 and 13, 20 and 27 January in 2013. The disease severity was indexed on a 0-10 disease scoring scale where, 0= Healthy plant; free of disease, 1= Dull leaves or few tiny tan spots, 2= A few small to large chlorotic spots, 3= Expanding lesions on leaves and leaf drop starting, 4=20% nodes on main stem showing chlorotic/necrotic symptoms and/or leaf drop, 5=40% nodes on main stem showing chlorotic/necrotic symptoms and/or leaf drop, 6= 60% nodes on main stem showing chlorotic/necrotic symptoms and/or leaf drop, 7= 80% nodes on main and lateral stems showing chlorotic/necrotic symptoms and leaf drop, 8= 100% leaves dried up/defoliated but small green tip recovering, 9= 100% leaves dried up/defoliated including tip but stem still green, and 10= Whole plant die and completely dried up. The crops were harvested at full matured stage. Data on yield and other characters were recorded from 10 randomly selected plants in each plot. The crop was harvested on 9-13 March in 2012 and 8-10 March in 2013. Grain yield were determined based on the whole plot and expressed in kilogram per hectare. The recorded data were analyzed statistically. Means of treatments were compared following Least Significance Difference (LSD) test.

Source of Information: Bangladesh J. Agril. Res. 40(2): 229-233, June 2015, ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Based on findings of the present study, it may be concluded that four times foliar spray with Rovral 50WP (lprodione) or Secure 600WG (Fenamidione + Mencozeb ) at an interval of 7 days may be recommended to control of Stemphylium blight of lentil.

Knowledge Management: Journal