Comparative Efficacy of Different Tactics for the Management of Okra Shoot and Fruit Borer, Earias Vittella (Fab.) under Field Condition

M.A Haque,M.A Rahman,M.M Rahman,M.M Uddin

doi:10.3126/ijasbt.v4i1.14465

M.A Haque, M.A Rahman + Show 2 more

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https://doi.org/10.3126/ijasbt.v4i1.14465

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Abstract

Comparative field efficacy of different control measures of okra shoot and fruit borer, Earias vittella were evaluated in the Entomology Field Laboratory, Bangladesh Agricultural University during February to May, 2014. Field efficacy of two selected chemical insecticides (Decis 2.5EC, Agritaf 50SP), three botanicals (Neem oil, Pitraj oil and Mahogany oil), one parasitoid (Trichogramma chilonis), Light trap along with Hand picking and Trap crop (Maize) were evaluated by analyzing percent shoot and fruit infestations. BARI-1 (okra variety) was used as a test crop in the experiment. Among the tactics, the minimum shoot (4.72%) and fruit infestations (6.77%) were observed in the plots treated with Decis 2.5EC followed by Neem oil treated plots (4.83% in shoot and 7.56% in fruit). The highest reduction of percent shoot infestation (79.89%) and fruit infestation (64.97%) over untreated control plots was found in the Decis 2.5EC sprayed plots followed by Neem oil while the lowest percent reduction of shoot infestation (29.86%) and fruit infestation (29.43%) were recorded in case of Light trap + hand picking. Neem oil and Decis 2.5EC were found very effective in managing E. vittella up to 7 days after each spraying. Agritaf 50SP, Pitraj oil, Mahogany oil, T. chilonis and trap crop were also found effective over untreated control plots although were significantly lower than Decis 2.5EC and Neem oil. Therefore, application of Decis 2.5EC and Neem oil were mostly effective and Light trap + hand picking was the least effective measures in controlling E. vittella.Int J Appl Sci Biotechnol, Vol 4(1): 74-78

Highlights

Okra (Abelmoschus esculentus L.) is one of the most common summer vegetables grown in Bangladesh which is known as lady's finger, dharos, vendi, gumbo
After seven days of first treatment application, the mean percentage of infested shoot was found minimum in Decis 2.5EC (3.28%) treated plots followed by Neem oil (3.30%) treated plots
The lowest percentage of infested shoot was recorded in Decis 2.5EC (5.55%) sprayed plot which was statistically similar to Neem oil (5.71%), Agritaf (7.86%) and Pitraj oil (9.07%) sprayed plot at 7 days after second treatment application

Summary

Introduction

Okra (Abelmoschus esculentus L.) is one of the most common summer vegetables grown in Bangladesh which is known as lady's finger, dharos, vendi, gumbo. It is well distributed in the Indian subcontinent and East Asia (Kochhar 1986). Okra shoot and fruit borer (OSFB), jassid, aphid, whitefly, and cotton leaf roller attack the okra where, OSFB (Earias vittella and E. insulana) is considered as one of the most destructive pests of okra (Aziz et al 2011; Butani and Jotwani 1984). Fruits become small and/or deformed and cause qualitative and quantitative losses. Farmers are using various synthetic insecticides vastly but due to the unconscious and unjustified use of synthetic insecticides create several problems in agro-ecosystem such as direct toxicity to beneficial insects, fishes, human health (Goodland et al 1985; Munakata 1977; Pimental 1981), insecticides resistance, environmental hazards etc

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