Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Management of Thrips Infesting Mung Bean Using Pesticides

S. Yasmin*
Department of Entomology, Sher-e-Bangla Agricultural University Sher-e-Bangla Nagar, Dhaka-1207, Bangladesh

M.A. Latif
Department of Entomology, Sher-e-Bangla Agricultural University Sher-e-Bangla Nagar, Dhaka-1207, Bangladesh

M. Ali
Department of Entomology, Sher-e-Bangla Agricultural University Sher-e-Bangla Nagar, Dhaka-1207, Bangladesh

M.M. Rahman
Department of Entomology, Sher-e-Bangla Agricultural University Sher-e-Bangla Nagar, Dhaka-1207, Bangladesh

Abstract/ Executive Summary:

The study was conducted to evaluate the effect of bio-pesticides and chemical insecticides namely Novastar 56EC, Stargate 48SC, Confidor 70WG, Actara 25aWG, Tracer 45SC, Ecomec 1.8EC, Bioneem plus 1EC to control thrips infesting mung bean in the experimental field of Sher-eBangla Agricultural University during November 2017 to February 2018. An untreated control observation was also evaluated. The efficacy of the treatments differed significantly and showed effective results in the reduction of thrips population and infestation on mung bean at vegetative and reproductive growth stages of the plant. Stargate 48SC (clothianidin) was the most effective insecticide against the thrips species Megalurothrips usitatus and Thrips palmi with the highest reduction of the population on top trifoliate leaves and terminal shoots (100.00 and 89.40%, respectively) at the vegetative stage and reduction on flower buds and flowers (86.04 and 85.95%, respectively) at reproductive stage of mung bean. The lowest flower bud and flower infestation (7.22 and 3.41%, respectively) and shedding (4.21 and 1.06%, respectively) by thrips with the highest number of pod (23.80 plant-1), seed (10.20 pod-1), 1000 seed weight (48.40 g) and yield (1026.91 kg ha-1) were also found in Stargate 48SC treated plots followed by Confidor 70WG and Actara 25WG treatments.

Keywords: Bio-pesticides, Chemical insecticides, Mung bean, Megalurothrips usitatus, Thrips palmi.

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

Start Date: 00-11-2016

End Date: 00-02-2018

Program Area: Pest Management

Commodity: Mungbean, Pesticide

Objectives:

Moreover, conventional insecticides provide poor control of insect pests and generally lead to pest resurgence. Therefore, to overcome these problems the use of biopesticides and new generation chemical neonicotinoids with novel modes of action that are active at very low dosages and manage thrips population is the ultimate alternative for effective pest management. Hence, the present study was planned to investigate the relative toxicity of some bio-pesticides and newer chemical insecticides in order to find effective control of thrips infesting mung bean

Methodology:

The experiment was conducted in the field of Sher-e-Bangla Agricultural University (SAU), Sher-e-Bangla Nagar, Dhaka, Bangladesh during November 2017 to February 2018. The plots were well prepared with good tilth and recommended fertilizers were applied for mung bean production during final land preparation (BARC, 2012). The experiments were laid out in Randomized Completely Block Design with three replications. The treatments were randomly allotted in each block. The seeds of BARI Mung-6 were directly sown on 2 November, 2017 in 2.5m×2m experimental unit plot with a distance of 50 cm between the plots and 100 cm between the replications on 2 November, 2017. The seeds were sown in rows with a spacing of 30 cm. The population of the plant was maintained constant by keeping plant to plant distance of 10 cm. After sowing seeds, irrigation and other intercultural operations were done. Eight treatments including Novastar 56EC @ 1 ml, Stargate 48SC @ 0.4 ml, Confidor 70WG @ 0.2 g, Actara 25WG @ 0.2 g, Tracer 45SC @ 0.4 ml, Ecomec 1.8EC @ 1 ml, Bioneem plus 1EC @ 1ml L -1 of water and untreated control were tested. Chemical insecticides and bio-pesticides were applied at 7 days interval to the foliage at vegetative stage when the thrips appeared and continued till the reproductive stage of the crop. Ten mung bean plants were randomly selected from each plot avoiding border plants. A white paper was placed under the top trifoliate leaves of each selected plant and shaked rapidly by using a soft brush (beating method). Then the number of adult Megalurothrips usitatus and Thrips palmi was counted. Data were collected two times at weekly intervals from top trifoliate leaves at the vegetative stage. After counting thrips population, treatments were applied and data were collected after 7 days following the same procedures. Similarly, the number of adult M. usitatus and T. palmi was counted two times from terminal shoots from the selected plants at the vegetative stage. As such the number of thrips of the two species was counted from ten flower buds and ten flowers of those selected plants of each plot at the reproductive stage. Data were collected ten times at weekly interval and treatments were applied after counting of adult thrips at every inspection. Percent reduction of thrips over untreated control was calculated. A number of total flower buds and flowers, number of infested flower buds and flowers, shedding flower buds and flowers plant-1 were recorded from the ten selected plants of each plot. Percent infestation and percent shedding of flower buds and flowers were also calculated. Harvesting was done three times when pods were matured. All pods were separated and counted from ten sample plants and the average number of pod plant-1 was calculated at each harvest. The average pod length and the number of seed pod-1 were recorded after harvesting from ten randomly selected pods and 1000 seed weight was taken from each plot at every harvest. Seed yield data was converted into kg ha-1 for each plot.

Statistical analysis: Data were analyzed by using MSTAT software. The significant differences among the treatment means were compared by DMRT at 5% level of probability

Source of Information: SAARC J. Agric., 17(2): 43-52 (2019)

Article Link (Online Journal): DOI: https://doi.org/10.3329/sja.v17i2.45293

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Among the bio-pesticides and chemical insecticides, Stargate 48SC was the most effective to control thrips, as it showed lower infestation and shedding of flower buds and flowers which cause higher pod formation and yield of mungbean. Among the bio-pesticides, Ecomec 1.8EC treated plots showed better results in controlling thrips. Stargate 48 SC would be the most effective treatment to suppress the thrips population during that time as well as the remaining cropping period.

Knowledge Management: Journal