June 2023 - 24

PEST CONTROL
" I'm not convinced the level
of reduction is enough for the
netting to be economically
viable, " Walgenbach said.
Part of the challenge is the
difficulty in securing the netting
tight enough at ground level to
keep the BMSB from getting
under it. Researchers also
saw no difference in weekly
treatments versus treating at threshold, but definitive
results were hard to come by.
" It's very difficult to do small-plot, replicated trials
on stink bugs because of their rapid dispersal, "
Walgenbach said.
The BMSB can also ingest insecticide and still damage
apples before they die.
Reducing BMSB populations on an area-wide basis
to decrease the numbers dispersing into the orchard is
the key. That means fostering biological controls, and a
promising one is the samurai wasp (Trissolcus japonicus).
The samurai wasp evolved in Asia with the BMSB and
was accidentally introduced into the U.S. The samurai
wasp can pick up on chemical clues to find the BMSB and
parasitize its eggs. The samurai wasp
has been detected in about 15 states
and continues to become more widely
established every year.
The success of fostering beneficials
like the samurai wasp depends on
reducing the need for broad spectrum
use of insecticides. Defining better
thresholds on when to treat for BMSB
would help with that.
" We initially thought pheromone traps would be
a simple way to assess populations and determine
thresholds, but we learned it's not as straightforward
as we anticipated, and there's a lot more work to do, "
Walgenbach said.
Traps only estimate populations in a very small area
and are likely not reflective of population densities on a
larger scale, which is complicated by the wide dispersal
characteristics of BMSB.
Determining monitoring programs and understanding
how pheromone trap captures can be used as decisionaid
tools was one of the objectives of the BMSB project.
Project results and more information are posted on
StopBMSB.org.
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June 2023

Table of Contents for the Digital Edition of June 2023
