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Field Evaluation of Microbial Derivatives for Management of Legume Pod Borer, Maruca Vitrata F. in Yard Long Bean

Robiah Noor Ahmed
Additional Deputy Director (PP), Department of Agricultural Extension (DAE), Natore, Rajshahi, Bangladesh

Mohammad Mahir Uddin
Professor, Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Md. Azizul Haque
Professor, Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Kazi Shahanara Ahmed
Professor, Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Globally, legume pod borer, Maruca vitrata F. is one of the major constraints in increasing the production of grain legumes including Yard-long bean (Vigna unguiculata subspecies sesquipedalis). The present research was conducted to evaluate the efficacy of two microbial derivatives viz. emamectin benzoate and spinosad along with a widely used chemical insecticide Nitro 505 EC for the management of legume pod borer M. vitrata in the field laboratory of the Department of Entomology, Bangladesh Agricultural University, Mymensingh during kharif season 2016. The experiment was done following RCBD with three replications of each treatment along with an untreated control. Microbial derivative, emamectin benzoate @ 1.0 g/L showed a significant better performance in comparison to spinosad and widely used chemical insecticide Nitro 505 EC in respect of benefit cost ratio and bio-efficacy on M. vitrata which reduced 55.52 and 68.37% flower and pod infestation, respectively subsequently resulting 47.90% increasing pod yield.

Keywords: Microbial, Management, Pod borer, Maruca vitrata, Yard long bean

Location: Entomology Department of BAU, Mymensingh

Start Date: 01-04-2016

End Date:

Program Area: Pest Management

Commodity: Insects, Yard long bean

Objectives:

The present study was undertaken to evaluate the efficacy of two microbial derivatives viz., emamectin benzoate and spinosad against legume pod borer in the yard long bean field.

Methodology:

The field trial of two microbial derivatives viz., emamectin benzoate and spinosad each having three doses along with a standard insecticide and untreated control was conducted against legume pod borer, Maruca vitrata F. at experimental field of Entomology Department of BAU, Mymensingh in kharif season 2016. The yard long bean seeds (Long Red Mollika) were sown on April 01, 2016 in 24 plots. Treatments were assigned in randomized complete block design with three replications. The distances of plot to plot and replicate to replicate were 1.0 m and 2.0 m, respectively. Each plot measuring 2.65m x 1.2m had 24 plants. Intercultural operations were done as and when needed. Fertilizers were applied as per recommendation [19] . Treatments were as follows: T1 = Emamectin benzoate (Proclaim 5SG) @ 0.5g, 1.0g and 1.5g /L of water. T2 = Spinosad (Tracer 45SC) @ 0.2ml, 0.4ml and 0.6ml /L of water. T3 = Standard insecticide (Nitro 505EC) @ 1.0 ml / L of water. T4 = Control (Untreated) All tested microbial derivatives and insecticide were sprayed at the above mentioned doses on the yard long bean plants using high volume knapsack sprayer. First spray was done at the time of flowering and was continued 7 days intervals up to harvesting. To ensure complete coverage of plants, spraying was done uniformly on the entire plant maintaining the distance around 25 cm between the nozzle and inflorescence. Sprayer was washed and cleaned after each spraying. Only water was sprayed in untreated control plots. The spraying was applied in the afternoon to avoid bright sunlight, drift caused by wind and save honey bees. Data were collected on first, third and seventh day after spraying. Number of healthy and infested flowers were counted and recorded from randomly selected 10 inflorescences per plot and to calculate percentage of flower infestation at each observation. During each data collection, number of healthy and infested pods were recorded and weighed to calculate the percentage of pod infestation and percentage yield increased. The number of legume pod borer larvae were counted and recorded from randomly selected 10 infested pods before spray and on 1st, 3rd and 7th day after spraying to calculate percentage of surviving larvae. All data were analyzed statistically after appropriate transformations and the means were separated using DMRT by MSTAT computer software.

Source of Information: Journal of Entomology and Zoology Studies 2020; 8(3): 162-166

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the results it was explored that both the spinosad and emamectin benzoate were more toxic to Maruca vitrata in comparison to chemical insecticide nitro 505 EC. Although, spinosad showed good result but in consideration of benefit cost ratio emamectin benzoate exhibited better performance. Emamectin benzoate @ 1.0 g/L was superior to all other insecticides in respect of benefit cost ratio and toxic action on Maruca vitrata and it reduced 55.52 and 68.37% flower and pod damage, respectively and consequently resulting 47.90% increase of pod yield of yard long bean.

Knowledge Management: Journal