As the
cooler weather of fall descends upon the mid-Atlantic, now seems to be a good
time to revisit one of our least favorite invasive insect species… the brown
marmorated stink bug. Why? If you have not noticed those nasty critters on windows
and doors, trying to get into a warmer environment, either you do not live
around here, your ability to see is challenged, or you are EXTREMELY lucky! To
state it more succinctly… THEY’RE BACK!!!
The
event that has led to the title of this entry ending with an exclamation point
took place either late last winter or early spring. This may take some
explaining… Here goes…
The
brown marmorated stink bug for those who may not be familiar with those
occasionally flying insects originated in Asia somewhere, and eventually,
landed here in the mid-Atlantic around fifteen years ago. The insects have
adapted well to the area and have spread throughout the region. The issue
addressed here is that before the 2011 growing season, most of the Agricultural
Extensive Service agents were petrified that 2011 would see an epidemic of
brown marmorated stink bugs, that is, a population explosion of unprecedented
scope. The damage that would be incurred by those insects could be…
catastrophic!
And in
2011, I scoffed at the analysis. Since I have been farming, relatively as long
as the first brown marmorated stink bug sighting on U.S. soil, I can always
remember seeing them. Some years there are more and some years there are less.
My main defense against any fear of a catastrophe is the birds that thrive on
the farm. Birds love bugs… even stink bugs! Anyway, I was curious to see what
would develop over the 2011 season, but I definitely expected NOT to see the
plague that was feared…
2011
was frightful!!! Egads! There was an earthquake, extreme heat, a hurricane
directly followed by a tropical storm that deluged the area so extensively that
the main field was a veritable pond for a month, and then… AND THEN there was a
six inch snow storm in… October… OCTOBER!!! What a crazy year!!! And amidst all
of those weather extremes, as I fought through those multiple crises, stink
bugs fell from my scope of importance. In fact, few brown marmorated stink bugs
were witnessed during that spell of unfortunate weather events. Where were the
stink bugs? I, for one, did not care since most of the crops had been ruined by
the absurd weather!
Now, a
year later, I suspect that some of those weather abnormalities significantly
diminished the brown marmorated stink bug population since about the average
number has been witnessed this year… until recently, that is. Nonetheless, now
that their numbers seem to be increasing after a relatively tame year… THEY’RE
BACK!
The
reason the title of this entry is “Stink bug!” is because earlier this year in
the late winter/early spring, I sarcastically made that statement when the
first stink bug was witnessed inside the house. In 2011, something like eighty
stinkbugs made it inside the house, which may be the most annoying trait of
those wretched creatures. Constantly, one would start buzzing around a light
fixture until, that is, it met the end of a stick I swung at it. Anyway, only
about a couple dozen made it into the house this year, and my reaction was a
scoff of sorts on the prediction of a stink bug epidemic…
And now
it is late September. The weather has cooled significantly. As a result, the
stink bugs are seeking warmer climates. Now, when cleaning the produce on the
back porch of the old farm house, stink bugs can be viewed clinging to every
wall and ceiling open to the outside air.
While
this form of stink bug activity is normal for this time of year, I have been
particularly struck by the number of stink bugs. They are everywhere. After
cleaning salad mix, I paused to inventory their stock, if you will. On the back
porch, there were dozens on the ceiling, posts, and walls of the summer
kitchen. On the vinyl siding of the house facing south that is the warmest
side, dozens of stink bugs dotted the white vinyl and clung to the window
screens. As I circled the house, they were on just about every area I looked,
including on every side of the CSA refrigerator on the front porch. Why the
refrigerator? Why not!
After
realizing that the number of stink bugs I witnessed was far greater than any
other previous year, I actually felt a little nervous. If their number had
increased that dramatically in one year…
“But
what is the real damage stink bugs can do?” you might ask. I will tell you. Especially
in organic vegetable and fruit farming, stink bugs do extensive damage. Even if
a farmer grows with the use of chemical pesticides, those pesticides are often
not very effective against brown marmorated stink bugs.
The
main difficulty with stink bugs is that they can fly from plant to plant and
their pattern of attack is extremely random. With some pests, their movements
can be easily predicted and thus attacked, but, and unfortunately, stink bugs
feast on so many different plants, at best, only random use of TFF is even
partly successful. (TFF is my organic approach to pest control. It stands for
“thumb and forefinger”, which are used to “squish” harmful bugs on sight.) The
list of vegetables damaged by stink bugs is indeed extensive. These include
tomatoes, peppers, beans and peas which are perhaps the worst damaged, but they
also feast on just about every other crop, albeit with less damage like the
broccoli/cabbage family, the chard/beet family, and many more. So now, their
damage:
Tomatoes
– Stinkbugs pierce a tomatoes skin and sucks out the juice. At first, this is
not noticeable, then in a day or two a round sunken soft spot develops that
expands greatly by the day. Organically, there is no way to prevent this other
than by preventing the stink bug bite in the first place, which as mentioned
above, is a random attack and virtually impossible to defend. My approach is to
attract as many birds as possible to help in the fight. The conventional farm
will most likely dust the tomatoes with the known carcinogen Sevin, which for
the most part keeps the stinkbug from landing on the tomatoes… and in the long
run leads to cancer.
Peppers
– Stinkbug attacks on peppers are very much like that of their cousins, the
tomatoes. Again, there is little one can ultimately do to prevent them
organically, other than attract their predators, birds.
Beans-
The damage on beans is less obvious than tomatoes and peppers, but it does
cause discoloration and premature matter break down. The main frustration for
the organic farmer is that often when the beans, and for that matter the
tomatoes, peppers and peas, are harvested absolutely no damage is visible. It
is only the next day or two that the damage reveals itself. Despite the
freshness of the harvest, it often leads to quite a short “shelf life”.
Peas –
Peas experience the same damage as beans.
As for
the other plants, say chard, there will be a hole or black spot on the leaves
that do not spread as much as on the juicier fruit of tomatoes and peas. This
damage is relatively easy to overlook… and forgive. And, since I do not have
enough experience with fruit at this point, I will not relay the damage they
cause on those crops, only to say that a fruit farmer friend of mine has
relayed that entire apple crops can be ruined by stink bugs.
After
all that… is there a brown marmorated stink bug plague in the near future? The
answer to that is that I do not know. However, one more quick story will relay
how nature loves to balance things out. The other day, I was washing salad mix
again, and heard a banging commotion on the house siding above. Since the back
porch is an overhang, I had to lean out off the porch edge and look up. What
was the commotion? Birds swooping in to gobble up the stink bugs clinging to
the siding! It was quite an impressive display. A day later, it was obvious
that the stink bug numbers had been greatly diminished.
I do
realize it would be completely naïve to think that birds could “rid” the farm
of the stink bug populace. Nature does love balance
after all. Even after watching the bird feast, I still expect for there to be
quite a few more brown marmorated stink bugs next year, and that is a reality
that will have to dealt with accordingly. Like it or not, brown marmorated
stink bugs are most likely here to stay.