Douglas fir; Fir; Larch; Pine; Spruce

Not known to transmit any human or animal pathogens.

Not known to vector any pathogens or other associated organisms.

When trapping for more than one species of moth, separate traps for different moth species by at least 20 meters (65 feet).

6/17/19: The instructions for trap modification have been updated and expanded to include pesticide strip and lure placement, funnel insert modification, and sample collection. See "Guidance for modified milk carton trap with funnel insert" in References section.

3/27/19: The milk carton funnel insert is in stock at the survey supply warehouse. Milk carton funnel inserts are required for Dendrolimus pini (Pine-tree lappet) and D. sibiricus (Siberian silk moth) survey. Note that the rain shield or cap of the milk carton trap makes inserting and removing the funnel from the top of the trap difficult. Consider inserting the funnel through the bottom of the trap. This is also the preferred way to check traps. The funnels are reusable, please use for multiple years.

Supply Product Name in the IPHIS Survey Supply Ordering System: Milk Carton Funnel Insert


2/13/19: Starting in the 2019 survey season, modified milk carton traps must be used in combination with the funnel insert. Modified milk carton traps used without the plastic funnel inserted are ineffective for Dendrolimus targets. Without the funnel, the moths are not contained, easily escaping through the large entry ports (2.5 cm wide x 3 cm high), or are not held long enough for adequate exposure to the killing agent, a DDVP strip.



2/3/12: The funnels that are used in the modified milk carton trap (see Trap modification instructions below) are no longer available. If you have funnels leftover from previous seasons, please continue to use them. If you do not have the funnels, continue to use the modified milk carton traps.

It is also required to use a killing agent, a DDVP strip, in the trap.

The lure is hung inside the top of the trap at the level of the entry ports. Preferably, the lure is placed inside the lure holders, which are typically distributed with the lures, and the lure holder is stapled to the trap. If the lure holder is not available, the lure can be stapled to a garden tie and hung inside the trap. The killing agent, the DDVP strip, is placed in the bottom of the trap.

Trap modification instructions:

Modify the standard gypsy moth milk carton by cutting a single large entry port (2.5 cm wide x 3 cm high) in each side by using a utility knife or similar tool to cut out the section of paperboard between the two existing entry ports. A plastic funnel (see Lance, 2006, Fig. 3; contact Otis lab for availability) is placed inside the trap (tube-down) so that the top edge of the funnel is at the level of the bottom of the entry ports. The lure is hung inside the top of the trap and a killing agent (DDVP strip) is placed in the bottom. Lures should be replaced at least monthly in cooler areas and perhaps as often as every 2-3 weeks in hotter climates (Lance, 2006).

The funnels can be reused for multiple years if cared for properly. Funnels should be removed from traps at the end of the season, washed in soap and water, rinsed, and stored dry. Please keep the funnels and re-use in subsequent years or ship the funnels back to the Otis lab so that other states may use them.

9/14/17: The lure for Dendrolimus sibiricus, Dendrolimus pini - Dendrolimus sibiricus Lure, is also effective for Dendrolimus pini. If Dendrolimus sibiricus is listed as a survey target in a work plan, then Dendrolimus pini must also be listed in the work plan.

The BHT (butylated hydroxytoluene) and tinuvin are stabilizers. The BHT is an anti-oxidant and the tinuvin is a light-stabilizer.

Morphological. Genitalia dissection is required to get to the genus level. Identification to species level requires confirmation by Lepidoptera specialist. For adults, use Passoa (2009).
Note: D. sibiricus is now the preferred name for D. superans sibiricus.

Dendrolimus sibiricus may be confused with other Dendrolimus species (there are no Dendrolimus species present in the U.S.) or other lasiocampids, including multiple species in the genus Gloveria, which occur in the U.S. Dendrolimus sibiricus may be differentiated from Gloveria by dissecting the male genitalia (Passoa, 2009). The valve of Dendrolimus pini and D. sibiricus have two projections, the smaller one either 1/5 or 3/4 as long as the larger one (Passoa, 2009). The valve of Gloveria have a single projection (Passoa, 2009).