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Clark, Thomas
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Mating disruption technology: An innovative tool for managing yellow stem borer (Scirpophaga incertulas Walker) of rice in Indonesia: Teknologi gangguan kawin: Inovasi untuk pengendalian penggerek batang kuning (Scirpophaga incertulas Walker) pada padi di Indonesia Iqbal, Muhamad; Marman, Maulana; Arintya, Fridia; Broms, Kristin; Clark, Thomas; Srigiriraju, Lakshmipathi
Jurnal Entomologi Indonesia Vol 20 No 2 (2023): July
Publisher : Perhimpunan Entomologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5994/jei.20.2.129.

Abstract

Yellow stem borer (YSB) of rice, Scirpophaga incertulas Walker, causes significant damage to rice production in Indonesia. YSB management largely depends on insecticide applications and alternative management practices are very few and impractical. Pheromone-mediated mating disruption (MD) is a new way to manage YSB while reducing dependence on conventional insecticides. Pheronâ„¢ RSB is an low-density polyethylene (LDPE) MD dispenser, containing 1.25 g of a four-way blended insect sex pheromone components - Z11-Hexadecenal, Z9-Hexadecenal, Z13-Octadecenal, Z9-Octadecenal in a ratio of 75, 8.6, 9.4, and 7 respectively. The objective is to evaluate MD by Pheronâ„¢ RSB as a tool for season-long management of YSB. Dispensers were applied at a rate of 20 dispensers/ha in a minimum area of 4 ha. We conducted these trials at 74 locations, non-replicated, across Java, in the wet and dry seasons of 2020–2021 where YSB are endemic and problematic. Efficacy of MD in pheromone foundational practice (PFP) was compared to conventional grower practice (CGP). Trap reduction, a measure of MD was significantly higher (>70%) in PFP as compared to CGP. A major benefit of MD is reduction in damage. Significantly lower damage to rice tillers (40–46%) was seen in PFP compared to CGP. Lower damage in PFP likely protected yield by 0.43 to 0.76 ton/ha compared to CGP. Compared to PFP, CGP required 40–56% higher insecticide applications to manage YSB.  Pheronâ„¢ RSB provided season-long MD and proved to be a powerful tool for integrated management of YSB.
Management of fall armyworm, Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) in maize (Zea mays L.) in Indonesia and Thailand via mating disruption: Pengendalian ulat grayak, Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) pada jagung (Zea mays L.) di Indonesia dan Thailand dengan gangguan kawin Srigiriraju, Lakshmipathi; Broms, Kristin; Sripeangchan, Mongkol; Khampuang, Kankunlanach; Ekalianna, Riedha; Ciptadi, Yulius Dika; Iqbal, Muhamad; Tran, Khai; Clark, Thomas; Sudarsono, Hamim; Meinhold, Peter
Jurnal Entomologi Indonesia Vol 21 No 3 (2024): November
Publisher : Perhimpunan Entomologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5994/jei.21.3.184

Abstract

The fall armyworm, Spodoptera frugiperda (Smith), has been problematic in Southeast Asia since its invasion in 2019. Fall armyworm management in these areas largely depends on synthetic insecticide application, and alternative management practices are very few and impractical. The demand for new and more sustainable tools for managing this pest has increased. In this study, we tested the mating disruption (MD) efficacy of fall armyworm sex pheromone in low-density polyethylene dispensers containing 2.5 g of blended active ingredients, (Z)-9-tetradecen-1-yl acetate (Z9-14Ac) and (Z)-11-hexadecen-1-yl acetate (Z11-16Ac) in a ratio of 87:13. The primary objective was to evaluate the optimal density of the dispensers/ha and understand the benefits of MD in reducing the damage caused by fall armyworm and associated insecticide applications as compared to conventional growers’ practices in Indonesia and Thailand. Research was conducted at 16 locations across Indonesia and Thailand in 2020 and 2021 in 9-ha treatment plots and compared to conventional growers practice. Trap reduction, a measure of MD, was significantly higher (74–90%) with 30 dispensers/ha than with non-dispenser areas, suggesting high levels of mating suppression. MD’s primary benefit is damage reduction, where 30 dispensers/ha reduced damage caused by fall armyworm larvae by 34–35% while simultaneously enabling a greater than 50% reduction in insecticide usage compared to the conventional growers’ practice. Our results show the effectiveness and feasibility of MD using pheromones as an essential management tactic for fall armyworm. These results represent a potential step towards more efficacious and sustainable pest management in Southeast Asia.
Co-Authors Arintya, Fridia Broms, Kristin Ciptadi, Yulius Dika Ekalianna, Riedha Hamim Sudarsono . Khampuang, Kankunlanach Marman, Maulana Meinhold, Peter Muhamad Iqbal Srigiriraju, Lakshmipathi Sripeangchan, Mongkol Tran, Khai