Title: Survey of stink bug (Heteroptera: Pentatomidae) egg parasitoids in wheat, soybean and vegetable crops in Southeast Virginia
1Survey 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
2Outline
- 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
3Stink 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
4Stink Bug Economic Damage of Selected US
Commodities
- (McPherson McPherson, 2000)
5Stink 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?
6Brown stink bug (Euschistus servus)
Green stink bug (Acrosternum hilare)
7Biological 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)
8Virginia 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
9Field 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
10Sentinel 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
11Surveyed Eggs
Total 12, 479 eggs
12Percent Parasitism
13(cont.)
14(cont.)
15(cont.)
16Parasitoid IDs
- All Hymenoptera
- Mymaridae
- Scelionidae-- Telenomus and Trissolcus
- Used keys by N.F. Johnson, Ohio State
17E. servus-- Telenomus podisi
18M. histrionica-- Trissolcus basalis a Mymarid
19A. hilare
Trissolcus eddesae
Trissolcus basalis
Not pictured Trissolcus euschisti
20Not So Generalist?
- Egg parasitoids tended to stick to certain host
species - Some crossover
- Stink bug host crop was irrelevant
21Significance
- 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
22THANK YOU!!
- Faculty
- Dr. Douglas Pfeiffer
- Dr. Scott Salom
- Dr. Kim Hoelmer, USDA-ARS-BIIR
- Graduate Students
- Kathy Kamminga, SB Survey Data
23Questions?