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Bioefficacy of Some Novel Insecticides and Biopesticides for Managing Bean Pod Borer, Maruca Vitrata Geyer

Salma Aktar
Department of Entomology, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Mohammad Mahir Uddin
Corresponding author:
Department of Entomology, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

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

Abstract/ Executive Summary:

Bean pod borer, Maruca vitrata Geyer is a key pest of bean causing up to 80 percent yield loss. The present study was conducted at the Entomology Field Laboratory of Bangladesh Agricultural University, Mymensingh, Bangladesh during October 2017 to March 2018 to evaluate the bioefficacy of some novel insecticides and biopesticides for managing bean pod borer on BARI Shim-2. Treatments were evaluated based on different parameters viz. no of the healthy and infested pod, percent pod infestation, and marketable pod yield (t/ha). The experiment was laid out in RCBD with 3 replications of each treatment. Eight treatments viz. T₁: Cartap (Suntap 50 SP), T₂: Flubendiamide, (Belt 24 WG), T₃: Lufenuron (Heron 5EC), T₄: B. bassiana, T₅: Cypermethrin, T₆: Spinosad (Libsen 45Sc), T₇: Emamectin benzoate (Suspend 5SG) and T₈: Untreated control. Treatments were applied at seven days interval and data were also collected seven days of each spraying. All the treatments significantly reduced bean pod borer infestation in the field. The best result was found in case of Emamectin benzoate treated plots which showed the highest cumulative mean number of healthy pod (46.00) and the highest increase of healthy pod (63.29%) over control by number, the lowest cumulative mean number of infested pod plot^-1 (2.88) and the highest reduction of infested pod over control (69.215%) by number. The highest cumulative mean weight of healthy pods plot-1 (240.66g), the highest percent increase of healthy pod over control (34.03%) by weight, the lowest cumulative mean weight of infested pods plot^-1 (6.44g) and the highest (%) reduction of infested pod weight over control (65.02%) were also obtained from Emamectin treated plots. Among the treatments the highest yield (7.1 ton ha^-1) and yield increase over control (32.58%) were also found from Emamectin. Cartap (Suntap 50 SP) showed the second best performance regarding the above parameters including the second highest yield (6.4 ton ha^-1). The lowest performance was always obtained from untreated control in case of all parameters studied. Though Cartap was very effective but considering the environmental issue Emamectin benzoate (Suspend 5 SG) would be recommended for sustainable management of bean pod borer in the field.

Keywords: Bean, Chemical insecticide, Biorational, Insect growth regulator, Management

Location: The Entomology Field Laboratory of Bangladesh Agricultural University, Mymensingh

Start Date: 00-10-2017

End Date: 00-03-2018

Program Area: Pest Management

Commodity: Insecticide, Bean

Objectives:

To evaluate the bioefficacy of certain novel insecticides and biopesticides for managing bean pod borer in the field.

Methodology:

The study was conducted at the Entomology Field Laboratory of Bangladesh Agricultural University, Mymensingh from October 2017 to March 2018 to evaluate the bioefficacy of certain novel insecticides and some biopesticides for managing bean pod borer in Rabi season. BARI Shim-2 developed by Olericulture division, Horticulture Research Centre, Gazipur and released by Bangladesh Agricultural Research Institute was used in this experiment. Seeds were collected from Natunbazar, Mymensingh. At first the experimental plot was ploughed with a country plough. Then the land was ploughed and cross-ploughed several times with a power tiller to obtain final tilth that was followed by laddering and spading. The stubbles of the crops and uprooted weeds were removed from the field and the land was then leveled prior to seed sowing. The entire experimental field was divided into three blocks. Each block was divided into 8 plots and total of 24 plots were made in the specified area for conducting the experiments. The plots were raised by 10 cm from the soil surface keeping the drain around the plots. Individual plots were prepared with basal dose of chemical fertilizers with the help of spade. At the same time before sowing final weeding was done to facilitate seed germination and to minimize crop weed competition. Two adjacent unit plots and blocks both were separated by 1 foot apart. After final preparation of pit, seeds were sown followed by a light irrigation to ensure soil moisture for germination. Five seeds were sown in each pit of experimental plot. Recommended fertilizer doses of 10 ton cowdung, 25 kg urea, 90 kg TSP, 60 kg MoP, Gypsum 5 kg and 5 kg Boric acid were adopted for one ha land. Half of the dose of urea and the total phosphorus were applied as basal dose and the rest of the urea was applied at 30 days after sowing. Well decomposed cowdung, gypsum, boric acid were also applied at the time of final land preparation. Mustard oil cake was also applied at the vegetative stage. After sowing a light irrigation was applied. All the agronomic practices were done to develop healthy plants for conducting experiments. Bamboo stalking was made for propping, allowing easy standing and preventing the plant from lodging. Each experimental plot was tagged properly considering the treatments and replications. The experiment was conducted with 8 treatments (T₁= Cartap (Suntap 50 SP, @ 1g/L), T₂=Flubendiamide [Belt 24 WG @ 1 ml/L], T₃= Lufenuron [Heron 5 EC @ 1 ml/L], T₄=Beauveria bassiana @ 5g/L, T₅= Cypermethrin @1 ml/L, T₆= Spinosad [Libsen 45 SC @ 0.5ml/L], T₇= Emamectin benzoate [Suspend 5 SG @ 1g/L] and T8= untreated control. Each of the treatment was replicated for three times. The experiment was laid out in a Randomized Complete Block Design (RCBD). The treatments were evaluated based on some parameters viz. no of healthy pods plot^-1, no of infested pods plot^-1, weight of healthy pods plot-1 and weight of infested pods plot-1 . Percent pod infestation by number and weight, percent protection of pod over control by number and weight were calculated from the collected data. Data were recorded at 7 days intervals after each spray. All treatments were applied with the aid of knapsack sprayer at seven days intervals. Mature pod were collected separately from each plot. Number and weight of damaged and healthy pods were recorded for each plot separately. Number of healthy pods was harvested and counted from each replication from the randomly selected five plants and then converted into number of healthy fruits plot^-1. Number of infested pods was recorded before spray and during harvest from the randomly selected five plants and then converted into infested fruits plot^-1. Finally, yield (ton ha^-1) of the healthy pod was calculated from data found from the experiment. Data were analysed using MSTAT-C and means were separated by DMRT.

Source of Information: J Bangladesh Agril Univ 18(2): 221–226, 2020; ISSN 1810-3030 (Print) 2408-8684 (Online)

Article Link (Online Journal): https://doi.org/10.5455/JBAU.96967

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In the present study data showed that all the treatments were significantly effective against the bean pod borer in comparison to control. The lowest healthy pod plot^-1, the highest infested pod plot^-1 and the lowest yield ha^-1 were obtained from untreated control plots. Among the treatments, the highest percentage increase of healthy pod and decrease of pod infestation were found in the Emamectin benzoate treated plot which was followed by Cartap and Spinosad. Similarly, the highest yield was obtained from Emamectin benzoate treated plots. Considering the efficacy against the pod infestation by M. vitrata and on the yield of pod it could be concluded that Emamectin benzoate might be incorporated as a component of IPM for sustainable management of bean pod borer.

Knowledge Management: Journal