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Hairy Chinch Bug Biology and Parasitoids in Ohio

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Recent observations of hairy chinch bug populations appears to conflict with earlier studies. ... Biology of Hairy Chinch Bug in Ohio. 2004 & 2005 Data. Two ... – PowerPoint PPT presentation

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Title: Hairy Chinch Bug Biology and Parasitoids in Ohio


1
Hairy Chinch Bug Biology and Parasitoids in Ohio
Mrs. Jennifer Andon Department of Entomology The
Ohio State University Columbus, OH 2004-2006
2
  • 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.
3
The Culprit
Blissus leucopterus hirtus Montandon
Family Blissidae Formerly Lygaeidae
4
Population Sampling Methods
  • Standard golf course cup cutter
  • U.S.A. standard sieve series
  • Berlese funnel

5
EVALUATION OF BEAUVERIA 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

6
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

7
Hairy Chinch Bug Populations in Ohio
Ex Niemczyk Shetlar 2000
8
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9
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10
  • Pathogens, Parasites, Predators
  • Conserve Parasitoids and Predators Homeowner
    agreed not to use insecticides during study.

11
Scelionidae
Eumicrosoma beneficum
12
Scelionid Egg Parasitoid
Scelionid adult inside HCB egg
Parasitized and normal egg
13
Other Natural Enemies
Bigeyed Bugs Geocoridae Predators
14
Beauveria bassiana
Hairy Chinch Bug cadaver with B. bassiana.
15
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

16
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.

17
Beauveria, and other microbes from infected
cadaver
Isolated culture of Beauveria bassiana
18
Dilution Series
19
Botanigard ES Enumeration
10-1 10-2 10-3 10-4 10 -5
10-6
16 billion CFUs per ml of Botanigard ES
20
Whats Next…
  • Challenge different HCB populations (recovered
    from different lawns) with fungal spores.
  • Repeat another field season of monitoring chinch
    bug populations.

21
Acknowledgements Thanks
  • OSU/OARDC
  • OTF
  • Bayer, FMC, The Scotts Co.
  • Mark Grunkemeyer, Buckeye Ecocare
  • Scott Jones, One Call
  • Gary Chatriand, Laverlam Intl
  • Columbus Area Master Gardeners
  • Dr. Dave Shetlar, Dan Digman
  • Dr. Mike Boehm, Amy Niver
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