Walnut twig beetle - Pityophthorus juglandis
EEffective: May 24, 2012 - December 31, 2013
Taxonomic Position:
Coleoptera : Scolytidae
Pest Type:
Insects
Pest Code (NAPIS):
INBQTOA
No manual – See Host Matrix |
These Approved Methods are appropriate for:
Human and Animal Pathogens Transmitted:
Not known to transmit any human or animal pathogens.
Plant Pathogens and Organisms Vectored:
Pityophthorus juglandis vectors the Geosmithia morbida fungus which causes "thousand cankers disease" (TCD) in walnut trees.
Survey
Approved Method(s):
Method |
Product Name / Instructions |
NAPIS Survey Method |
Visual |
Follow instructions in the survey protocol: Thousand Cankers Disease Survey Guidelines for 2012 (USDA FS and PPQ, 2012). |
3031 - General Visual Observation
|
Trap |
105 - Multi-funnel Trap, 8 Funnel, Wet
|
3001 - General Trapping Procedure |
Trap |
107 - Multi-funnel Trap, 12 Funnel, Wet
|
3001 - General Trapping Procedure |
Trap Spacing and Placement: When trapping for woodborers or bark beetles, separate traps with different lure combinations by at least 30 meters (98 feet).
Method Notes:
June 12, 2012: The TCD Guidelines recommend using a 4-unit multi-funnel trap for convenience and to minimize cost. However, traps with a larger number of funnels (8 or 12) will also capture walnut twig beetles and are acceptable for use in surveys.
May 24, 2012: A trap and lure survey method has been approved for use for the 2012 season and beyond.
Approved Lure(s):
NAPIS Code |
Product Name |
Dispenser |
Effectiveness |
Compound(s) |
55 |
Pityophthorous juglandis Lure |
polysleeve |
50 days |
|
Identification
ID/Diagnostic: Morphological
Morphological. Pityophthorus is a large genus (>100 species in North America) and identification to species can be difficult since these are very small beetles and the distinguishing characters are often hard to discern without high magnification and good optics. To screen samples, refer to the screening aid by Labonte and Rabaglia (2010) and the TCD Guidelines for 2012. Suspect specimens should be submitted to an identification specialist for verification (follow the instructions in the TCD Guidelines for 2012).
Mistaken Identities:
Other native Pityophthorus spp.