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Hairy Chinch Bug Biology and Parasitoids in Ohio. Mrs. Jennifer Andon Department of Entomology The Ohio State University Columbus, OH 2004-2006. Objectives. Survey and document the annual populations of hairy chinch bugs and their egg parasitoid in Ohio lawn-type turf.

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slide1

Hairy Chinch Bug Biology and Parasitoids in Ohio

Mrs. Jennifer Andon

Department of Entomology

The Ohio State University

Columbus, OH

2004-2006

slide2

Objectives

  • Survey and document the annual populations of hairy chinch bugs and their egg parasitoid in Ohio lawn-type turf.
  • Determine if HCB populations obtained from lawns being maintained at different levels of management vary in susceptibility to Beauveria bassiana infection.

Why?

Recent observations of hairy chinch bug populations appears to conflict with earlier studies.

We have found HCB in irrigated lawns which were thought to be at low risk for infestation.

slide3

The Culprit

Blissus leucopterus hirtus Montandon

Family: Blissidae

Formerly: Lygaeidae

population sampling methods
Population Sampling Methods
  • Standard golf course cup cutter
  • U.S.A. standard sieve series
  • Berlese funnel
slide5

EVALUATION OFBEAUVERIA SUSCEPTIBILITY

Reared HCB colonies obtained from irrigated and non-irrigated lawns on sorghum in the greenhouse.

  • Butyrate and Plexiglas cylinders
  • Pro-mix
  • Peat Moss
  • 16 hrs day light
  • 75° F day temp
  • 70° F night temp
slide6

Biology of Hairy Chinch Bug in Ohio

2004 & 2005 Data

  • Two generations per year
  • Adults overwintered in lawns
  • Oviposition began in early May
  • 1st generation nymphs peaked in mid-June
  • 1st generation adults began egg lay by mid-July
  • 2nd generation adults observed in early September
  • Reproductive diapause commenced in October, chinch bugs descend into thatch and debris
hairy chinch bug populations in ohio
Hairy Chinch Bug Populations in Ohio

Ex: Niemczyk & Shetlar 2000

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Biological

Pathogens, Parasites, Predators

  • Conserve Parasitoids and Predators – Homeowner agreed not to use insecticides during study.
scelionidae
Scelionidae

Eumicrosoma beneficum

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Scelionid Egg Parasitoid

Scelionid adult

inside HCB egg

Parasitized and

normal egg

other natural enemies
Other Natural Enemies

Bigeyed Bugs Geocoridae

Predators

beauveria bassiana
Beauveria bassiana

Hairy Chinch Bug cadaver with

B. bassiana.

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Beauveria bassiana

  • Deuteromycetes
  • “White Muscardine”
  • Ubiquitous, soil-borne fungus
  • Requires moist, warm conditions to sporulate
  • Hyphae penetrate insect cuticle
  • Toxin (beauvericin) relaeased to kill insect
  • Mycelium proliferates inside insect
  • Insect dies in 3-4 days
slide16

Beauveria bassiana Study

Except

  • High maintenance lawns, i.e., regular fertilization and irrigation, have been observed with HCB infestations
  • Therefore, have populations of HCB become less susceptible to Beauveria infection?
  • I will evaluate Botanigard ES, a commercial formulation of Beauveria bassiana and determine if varying susceptibility to B.b. has developed.
slide17

Beauveria, and other microbes from infected cadaver

Isolated culture of Beauveria bassiana

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Botanigard™ ES Enumeration

10-1 10-2 10-3 10-4 10 -5 10-6

16 billion CFUs per ml of

Botanigard ES

what s next
What’s Next…
  • Challenge different HCB populations (recovered from different lawns) with fungal spores.
  • Repeat another field season of monitoring chinch bug populations.
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Acknowledgements – Thanks

  • OSU/OARDC
  • OTF
  • Bayer, FMC, The Scotts Co.
  • Mark Grunkemeyer, Buckeye Ecocare
  • Scott Jones, One Call
  • Gary Chatriand, Laverlam Int’l
  • Columbus Area Master Gardeners
  • Dr. Dave Shetlar, Dan Digman
  • Dr. Mike Boehm, Amy Niver