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Mst. Arifunnahar
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Mst. Mozzalina Khatun
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Md. Alamgir Hossain
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Md. Abdul Alim
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

The bean bug, Riptortus pedestris Fabricius (Hemiptera: Alydidae) is a polyphagous seed-sucking major pest of leguminous crops distributed worldwide. Effective management of this notorious insect pest is a major concern to growers. In this study, the efficacy of seven pesticides was assayed at field recommended doses against R. pedestris by topical application, exposure to residue and oral ingestion in laboratory conditions. Our results showed that cypermethrin and chlorpyrifos + cypermethrin exhibited high toxicity causing 100% mortality within 4 hours after treatment both by topical and oral ingestion method. Profenofos + cypermethrin showed 100% mortality by topical application and oral ingestion within 16 and 12 hours after treatment. On the other hand, chlorpyrifos + cypermethrin and cypermethrin caused 100% mortality within 8 hours after treatment by residue on the substrate. Therefore, for the integrated pest management program, cypermethrin (1.0 ml/L), chlorpyrifos + cypermethrin (1.0 ml/L), and profenofos + cypermethrin (2.0 ml/L) can be used for chemical control of R. pedestris. Further experimentation is needed to check their efficacy in field condition.

  Acute toxicity, Riptortus pedestris, Topical application, Residual exposure
  Hajee Mohammad Danesh Science and Technology University (HSTU) campus, Dinajpur, Bangladesh
  00-00-2019
  00-00-2019
  Pest Management
  Insects

To ensure sustainable plant protection and environmentally safe for the beneficial insects, need and to identify the appropriate pesticides for controlling R. pedestris.

Collection and mass rearing of insects: Adults of R. pedestris were collected from mungbean (BARI Mug 5) fields in Hajee Mohammad Danesh Science and Technology University (HSTU) campus and reared in the laboratory of the department of Entomology, HSTU during 2019. The mass culture of R. pedestris was maintained in the laboratory according to the methods described by Alim and Lim (2010). The nymphs and adults were kept in separate acryl cages (40L × 40W × 40H cm) with windows in three lateral sides covered with meshed (0.50 mm) screens for ventilation at ambient temperature (31.62°C ± 0.16), relative humidity (79.25% ± 1.60) and natural photoperiod (L:D, 13:11 h). Temperature and relative humidity were measured by the Hydro-thermometer (HTC-1), (Brand Name: Ace Instruments; Manufacturer: HTC instruments, China). Ascorbic acid dissolved in water and dried soybean seeds were provided to adult R. pedestris as food. The nymphs were transferred into another glass cage with windows in three lateral sides covered with meshed screens for ventilation. Mungbean plants with cotyledonous leaves provided for nymphs as food sources. Four pieces of gauze cloth were placed on upper and bottom corners inside the adult cages as oviposition substrates. Water-soaked cotton and soybean seeds were changed twice a week. The cage was cleaned two times in a week. Eggs were collected from the acryl cages and new gauzes were placed in acryl cages daily and kept in another cage for the use in the experiment. Adults (7 days old) were collected for the purpose of experiments. Lethal effect of pesticides: Six insecticides and one herbicide were collected from local market of Dinajpur district and tested in this experiment. Each pesticide was diluted with 250 ml of distilled water to make field recommended concentration.  Statistical analyses: Lethal effects, Chi-square and LT50 values were obtained by probit analysis using PoloPlus (Robertson et al., 2007). Significant differences among the treatments in each assay were recorded when confidence intervals (CI) were 95%. Data of spraying methods were compared among the treatments by a normal approximation of the chi-square test on pooled data (Zar, 2010) and using two factors ANOVA in SPSS program (version 32.0). Toxicity Index (TI) was calculated by LT50 of control divided by LT50 of each treatment.

  J Bangladesh Agril Univ 19(2): 000–000, 2021; ISSN 1810-3030 (Print) 2408-8684 (Online)
  https://doi.org/10.5455/JBAU.72976
Funding Source:
1.   Budget:  
  

In this study, we had tested six commonly used insecticides and one herbicide against R. pedestris by three different methods, i.e., topical application, residual exposure and oral ingestion. The results showed that cypermethrin, chlorpyrifos + cypermethrin, profenofos + cypermethrin were highly toxic to R. pedestris in laboratory assay of topical application, exposure to the residue and oral ingestion. Therefore, cypermethrin, chlorpyrifos+cypermethrin, profenofos+cypermethrin imidacloprid and thiamethoxam were suggested to use the control of R. pedestris in Bangladesh.

  Journal
  


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