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Optimizing metabolic stress disinfection and disinfestation components to control Pseudococcus longispinus

Felix Zulhendri1, H Nihal De Silva, Lisa E Jamieson

  • 1The New Zealand Institute for Plant & Food Research Limited, 120 Mt Albert Rd., Sandringham, 1025, Auckland, New Zealand.

Journal of Economic Entomology
|August 30, 2012
PubMed

Insights

Metabolic stress disinfection and disinfestation (MSDD) effectively controls longtailed mealybugs. Optimized MSDD parameters reduced treatment time and vacuum pressure while achieving 99% mortality across all mealybug life stages.

Area of Science:

  • Agricultural Entomology
  • Pest Management
  • Biotechnology

Background:

  • Longtailed mealybug (Pseudococcus longispinus) is a significant agricultural pest.
  • Metabolic stress disinfection and disinfestation (MSDD) is a known method for pest control.
  • Previous MSDD protocols involved a 30-min physical phase and a 60-min chemical phase.

Purpose of the Study:

  • To investigate the impact of varying MSDD components on mealybug mortality.
  • To optimize MSDD parameters for maximum efficacy against Pseudococcus longispinus.
  • To determine the ideal duration of physical and chemical phases, ethanol concentration, and vacuum level.

Main Methods:

  • Binary logistical regression was used to analyze mealybug mortality data.
  • MSDD components including phase durations, ethanol concentration, and vacuum levels were systematically varied.
  • Optimization aimed to achieve 99% mortality across all mealybug life stages (adults, nymphs, crawlers).

Main Results:

  • Optimal conditions identified: 30-min physical phase, 45-min chemical phase, 275 mg/L ethanol, and 30 kPa vacuum.
  • These optimized components achieved 99% mortality for all tested longtailed mealybug life stages.
  • The optimized protocol resulted in a 15-min reduction in total treatment time and a 20-kPa decrease in vacuum pressure.

Conclusions:

  • All four investigated MSDD components are crucial for optimal insecticidal efficacy.
  • Optimization significantly reduced treatment duration and vacuum extent while maintaining high mortality rates.
  • The refined MSDD protocol offers a more efficient and potentially less resource-intensive method for mealybug control.

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