Survey of stink bug (Heteroptera: Pentatomidae) egg parasitoids in wheat, soybean and vegetable crops in Southeast Virginia - PowerPoint PPT Presentation

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Survey of stink bug (Heteroptera: Pentatomidae) egg parasitoids in wheat, soybean and vegetable crops in Southeast Virginia

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Survey of stink bug (Heteroptera: Pentatomidae) egg parasitoids in wheat, ... Swept and visually inspected field and vegetable crops for stink bug egg masses ... – PowerPoint PPT presentation

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Title: Survey of stink bug (Heteroptera: Pentatomidae) egg parasitoids in wheat, soybean and vegetable crops in Southeast Virginia


1
Survey of stink bug (Heteroptera Pentatomidae)
egg parasitoids in wheat, soybean and vegetable
crops in Southeast Virginia
Amanda L. Koppel Dr. Ames Herbert, Tidewater
AREC Dr. Tom Kuhar, Eastern Shore AREC 12/11/06
2
Outline
  • Introduction
  • About stink bugs
  • Stink bugs in SE Virginia
  • Control
  • Methodology
  • Field survey
  • Sentinel eggs
  • Results
  • Rates of parasitism
  • Egg parasitoid species complex
  • Discussion Further Study

3
Stink Bugs (Heteroptera Pentatomidae)
  • Phytophagous and predatory species
  • Pentatominae include spp. of economic importance
  • Feed with stylets
  • Damage to plants
  • Cosmetic
  • Growth and development
  • Yield and quality

4
Stink Bug Economic Damage of Selected US
Commodities
  • (McPherson McPherson, 2000)

5
Stink Bugs in SE Virginia
  • Treatment
  • Economic thresholds
  • Pyrethroids are insecticide of choice
  • Stink bugs may not be seen as a threat!
  • Monitoring
  • Blacklights
  • Pyramid traps
  • Field survey
  • Most common species?

6
Brown stink bug (Euschistus servus)
Green stink bug (Acrosternum hilare)
7
Biological Control of Stink Bugs
  • Egg parasitoids are most common
  • Natural enemy surveys
  • Carolinas (Jones et al. 1996)
  • Louisiana (Orr et al. 1986)
  • Kentucky (Yeargan 1979)
  • Florida (Temerak Whitcomb 1984)
  • California (Ehler 2002)
  • Brazil (Correa-Ferreira Moscardi 1995)

8
Virginia Stink Bug NE Survey (2005-06 field
seasons)
  • Objectives
  • To determine if there are stink bug natural
    enemies (specifically, egg parasitoids) in SE VA
  • Determine rates
  • of parasitism
  • Determine parasitoid
  • species composition

9
Field Eggs
  • Swept and visually inspected field and vegetable
    crops for stink bug egg masses
  • Masses returned to the lab
  • Noted
  • Parasitoids
  • Stink bug nymphs
  • No hatch

10
Sentinel Eggs
  • From lab colony
  • Placed in the field for a week
  • Pinned to the underside of leaves
  • Collected and returned to quarantine
  • Observed as field eggs

11
Surveyed Eggs
Total 12, 479 eggs
12
Percent Parasitism
13
(cont.)
14
(cont.)
15
(cont.)
16
Parasitoid IDs
  • All Hymenoptera
  • Mymaridae
  • Scelionidae-- Telenomus and Trissolcus
  • Used keys by N.F. Johnson, Ohio State

17
E. servus-- Telenomus podisi
18
M. histrionica-- Trissolcus basalis a Mymarid
19
A. hilare
Trissolcus eddesae
Trissolcus basalis
Not pictured Trissolcus euschisti
20
Not So Generalist?
  • Egg parasitoids tended to stick to certain host
    species
  • Some crossover
  • Stink bug host crop was irrelevant

21
Significance
  • Great deal of heretofore unknown biological
    control in VA
  • Meaning to farmers
  • Effect of chemical sprays on parasitoid
    oviposition
  • Parasitization in both 1st and 2nd generations
  • Choice testing of Telenomus podisi

22
THANK YOU!!
  • Faculty
  • Dr. Douglas Pfeiffer
  • Dr. Scott Salom
  • Dr. Kim Hoelmer, USDA-ARS-BIIR
  • Graduate Students
  • Kathy Kamminga, SB Survey Data

23
Questions?
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