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Early Detection

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This report discusses the early detection of gypsy moths using pheromone lure traps that capture male moths during their search for mates. It outlines trap catch trends from 2006 to 2011, highlighting population growth and its implications. The document explores how gypsy moths spread naturally and artificially, emphasizing the role of larval dispersal through human activities and environmental factors. It also reviews management options including Bacillus thuringiensis (Btk) and pheromone-based strategies, which have successfully controlled gypsy moth populations in Minnesota since 1980.

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Early Detection

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Presentation Transcript

  1. Early Detection • Pheromone Lure Traps • Male moths are caught as they try to find a mate • Sticky interior

  2. 2006-2011 Trap Catch Trends 2008 2006 2007 2009 2010 2011

  3. Gypsy Moth in Minnesota • Counts increase as main population nears • Population growth increasing • Meteorological explanation?

  4. How Do Gypsy Moths Spread? Natural Artificial Tourism “Ballooning of larvae” Nursery stock Household moves Life stages are transported by humans 13-16 miles per year Populations expand 1¼ miles per year due to larval dispersal

  5. Predators and Pathogens • Entomophaga maimaiga • NPV (nucleopolyhedrosis virus) • Mammals • Birds • Amphibians • Invertebrates NPV E. maimaiga

  6. Factors That Influence Spread Rates • Early season temperatures & larval survival • Wind events & larval dispersal • Habitat & host abundance • Spring rains & disease incidence • Predator habitat & predation rates • PEOPLE through artificial introductions

  7. National Gypsy Moth Management

  8. Management Options • Bacillus thuringiensis var. kurstaki (Btk) • Common soil bacterium toxic to GM caterpillars • Halts feeding • Disparlure (mating disruption) • Targets adults • Reduces mating success • Diflubenzuron • Interferes with molting • Often used in nursery settings • Treatments in Minnesota have kept gypsy moth in check since 1980!

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