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Eco-friendly Management of Okra Shoot and Fruit Borer Using Bio-control Agents

Ruhul Amin
Department of Entomology, Sher-e-Bangla Agricultural University, Bangladesh

Md. Emam Hossain
Department of Entomology, Sher-e-Bangla Agricultural University, Bangladesh

Rebaka Sultana
Department of Horticulture, Sher-e-Bangla Agricultural University, Bangladesh

Md. Aliul Alam
Department of Soil Science, Sher-e-Bangla Agricultural University, Bangladesh

Md. Awlad Hossain
Department of Agricultural Chemistry, Sher-e-Bangla Agricultural University, Bangladesh

Abstract/ Executive Summary:

The purpose of this study was to evaluate the efficiency of certain biological control agents for the ecologically sound and sustainable management of okra shoot and fruit borer (OSFB) at the Sher-e-Bangla Agricultural University, Dhaka. Randomized Complete Block Design (RCBD) with three replications was used for this experiment. It consists of seven different types of treatments, including as application of Trichogramma evanescence @5 Tricho cards/plots (T₁), Trichogramma evanescence @0.08 g/plot (T₂), Bracon hebetor @10 adults (Male: Female = 4:6) per plot (T₃) while applying Bracon hebetor @15 adults (Male: Female = 6:4)/plot (T₄). Applying Bacillus thuringiensis Serovar kurstaki @2ml suspension/liter water/4plot in T₅ and Bacillus thuringiensis Serovar kurstaki @1ml suspension/liter water/plot in T₆. T₇ stands for untreated control in this study. All the treatments were applied at 7 days intervals. The best performance was obtained from treatment (T₅) in reducing the shoot and fruit infestation (56.88 and 71.86%, respectively) by number and weight over control. The maximum total fruit yield (6544 kg/ha), i.e., 71.30% increase over control of okra, was produced in T₅. So, from the present study, it may be revealed that bio-control agents can be used for the ecologically sound and sustainable management of okra shoot and fruit borer. Bacillus thuringiensis Serovar kurstaki may be used in this regard and the optimum dose may be 2ml suspension/liter water/plot and 7 days application interval should be followed.

Keywords: Bio-control agents, Eco-friendly management, Okra shoot and fruit borer, Food safety, Organic vegetable

Location: Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh

Start Date: 00-01-2018

End Date: 00-06-2018

Program Area: Crop-Soil-Water Management

Commodity: Okra

Objectives:

To document the occurrence of OSFB and evaluate the effectiveness of some biological control agents.

Methodology:

The present demonstration was carried out at the research field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh, from January to June 2018. The demonstration plot was characterized as having shallow red-brown terrace soil with a pH range of 5.8-6.5. Using a randomized complete block design with three replications, the demonstration was conducted. The treatments were as bellows applied in the seven days interval in all cases. T₁ Trichogramma evanescence@5 Tricho card/plot; T₂ Trichogramma evanescence@0.08 g/plot; T₃ Bracon hebetor @10 adults (Male: Female = 4: 6)/plot; T₄ Bracon hebetor @15 adults (Male: Female = 6: 4)/plot; T₅ Bacillus thuringiensis Serovar kurstaki@2ml suspension/liter water/plot; T₆ Bacillus thuringiensis Serovar kurstaki @1ml suspension/liter water/plot; T₇ Untreated control. To make things easier, the primary experimental plot was separated into three major parts. There were also seven sub-plots in each major block, resulting in a total of 21 plots and each unit subplot was 3m long and 2m wide, with a 0.75m plot-to-plot spacing in between. The seed materials used in this assessment were collected from Advanced Chemical Industry (ACI) Limited and were sown on the field on 15th January. According to the fertilizer recommendation guide (BARC, 2012), manures and fertilizers were applied to produce okra per hectare. All the Intercultural operations were performed when for ensuring the normal physiological build-out of the crop. Data on different parameters were collected from five randomly selected and tagged okra plants. The incidence of OSFB infestation on okra plants was inspected at both (vegetative and reproductive) life stages. Infestation on okra shoots by number was documented at seven days recess period after intensive documentation on the existence of OSFB and their faecal material at both plant life stages. The infestation status on okra fruit was recorded at the reproductive stage. The number of infested okra fruits by OSFB was counted at harvesting at three days intervals. Data analysis was done with MSTAT-C software and treatment means were separated by Duncan’s Multiple Range Test (DMRT) (Gomez, 1984).

Source of Information: J. Biosci. Agric. Res. 28(01): 2335-2340, 2021

Article Link (Online Journal): https://doi.org/10.18801/jbar.280121.283

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In shoot and fruit infestation, due to the management of okra shoot and fruit borer by bio-control agents, the lowest infestation was recorded in T₅ (14.33% and 14.75%, respectively) fruit infestation over control by 56.88% and 71.86%, respectively. On the contrary, maximum infestation on shoot and fruit (33.24 and 52.42% respectively) was recorded in T₇ (untreated control). This means that the treatment consisting of applying Bacillus thuringiensis Serovar kurstaki @2ml suspension liter water plot for seven days (T₅) worked better in decreasing shoot and fruit infestation by number as well as weight. Overall fruit output (6544 kg/ha) was likewise the highest, up to 71.30 percent above the control of okra. To summarize, bio-control agents can be utilized to manage okra shoot and fruit borer pests in a safe, environmentally sound, and sustainable way (OSFB). One of the most effective biological control methods was applying Bacillus thuringiensis Serovar kurstaki @2ml suspension/liter water/plot at a seven-day break.

Knowledge Management: Journal