1 - Phytosanitary Resources

Survey Procedures
Figure 4-9 Pan Trap with Pheromone Lure and Protective Cage (Russell IPM Ltd.,
http://www.tutaabsoluta.com/agriphotos.php?lang=en )
Delta Traps
Delta traps consist of a triangular-shaped body (manufactured of paper or
plastic) opened at both ends, a removable sticky insert placed inside on the
floor of the triangle, and a pheromone lure suspended above the sticky insert
(typically using a pin or a basket). Refer to Figure 4-10 on page 4-14,
Figure 4-11 on page 4-14, and Figure 4-12 on page 4-14 for images of Delta
traps.
Paper and plastic Delta traps are available from ISCA Technologies. Paper
Delta traps measure 12 by 10 by 18 cm (5 by 4 by 7 in) and plastic traps
measure 28 by 20 by 15 cm (11 by 8 by 6 in). Recent trials in France suggest
that it is best to place the pheromone lure directly on top the sticky insert
(FREDON-Corse, 2009a).
Male moths that follow the pheromone plume and enter the Delta trap can be
captured on the sticky insert. In tomato plantings, hang Delta traps on stakes
near plant foliage, about 1 meter off the ground. In general, trap location
should not be higher than 1 to 2 ft (0.30 to 0.60 m) above the top of the tomato
or other host plants because Tuta absoulta males fly close to the host plants
(Al-Zaidi, 2009). The trapping or retention mechanism in Delta traps (sticky
inserts) keep the insects dry in case further specimen examination is needed.
However, in heavy infestations, sticky inserts can become saturated with
trapped males or moth scales causing them to lose their effectiveness at
capturing and retaining additional moths. In these situations, service the traps
more frequently.
6/2011 Tomato Leafminer 4-13
Emergency and Domestic Programs