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Natural Science Forum / Biology / Biology / January 2005



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chick pea bugs

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Allan Adler - 05 Jan 2005 19:19 GMT
For several months, I've had some chick peas in a jar that used to hold
tomato sauce and which I cleaned pretty thoroughly and dried before putting
the chick peas in it. The jar is always closed when I'm not taking chick
peas out to soak them. However, before the jar became available, the chick
peas were sitting in the plastic bag they came in and which might have
had a hole. Anyway, last night, I noticed some bugs inside the jar.
They aren't cockroaches or anything I'm familiar with. My guess is that:
(1) There is some insect that lays its eggs in chick peas.
(2) Most chick peas have the eggs.
(3) The chick peas are normally cooked and eaten, killing the eggs long
   before the eggs have a chance to develop.
(4) Dried chick peas left in a jar will eventually manage to absorb enough
   water from the air to make it possible for the dormant eggs to mature,
   although it might take several months or even years.
(5) The jar is next to a wall that has a pipe in it which  radiates some
   heat. Maybe with the onset of winter, the increased heat contributed
   to the bugs' development.

There is probably a moral in this, such as "Eat your chick peas promptly"
or "Learn to love chick pea bugs", but I'd just like to know the following:
(a) What kinds of bugs might these be and where can I find pictures of them
   and other information about them?
(b) I don't mind them as long as they stay in the closed jar, since I think
   I might learn something by observing the chick pea bug ecosystem in the
   jar. That is a passive activity. If there is a better way to maintain
   and control the ecosystem and to study the bugs, I'd like to know about
   it. I don't have any equipment other than a microscope at the moment, not
   even stains. I don't want them to escape into the apartment, and that
   has higher priority than any other goals I might have for the chick
   pea bug ecosystem.
(c) At the moment, I have been looking at the jar with a magnifying glass.
   It seems to me that the chick peas look rather less appetizing than when
   I bought them, but I'm not sure they are decaying. That is one thing I
   would want to find out somehow. Also, the bugs generally are not in the
   focus of the magnifying glass, although if I rotate the jar they sometimes
   pass through the field of view. So, a better way to observe the scene
   in situ would also be welcome. I don't suppose there are special
   binoculars for observing bugs in a jar, are there?
Signature

Ignorantly,
Allan Adler <ara@zurich.csail.mit.edu>
* Disclaimer: I am a guest and *not* a member of the MIT CSAIL. My actions and
* comments do not reflect in any way on MIT. Also, I am nowhere near Boston.

r norman - 05 Jan 2005 20:21 GMT
>For several months, I've had some chick peas in a jar that used to hold
>tomato sauce and which I cleaned pretty thoroughly and dried before putting
[quoted text clipped - 34 lines]
>    in situ would also be welcome. I don't suppose there are special
>    binoculars for observing bugs in a jar, are there?

You probably don't want to examine too closely any raw plant material
that you plan to eat.  Salad greens often carry many critters.  If you
get material from "organic" or "health food" stores or local farmers'
markets that would be especially true since it is less likely that the
stuff has been excessively treated with chemicals or had very thorough
washing.  That doesn't mean the stuff is not good to eat, just that
knowing about it makes it a bit less appealing.  As the old saying
goes, the only thing worse than finding a worm in the apple you are
eating is finding half a worm!

It is unlikely that the things will escape if you take out one or two
seeds to examine.  If you are really concerned, put them into a
plastic bag for examination.
Allan Adler - 06 Jan 2005 02:38 GMT
> You probably don't want to examine too closely any raw plant material
> that you plan to eat.

I have since looked at the book, "The microscopy of vegetable foods",
by Winton and Moeller, published in 1906. There are a couple of pages
devoted to chick peas. They have a lot of interesting information, such
as:
(a) that chick peas are used as a substitute for coffee
(b) drawings and discussion of microscopic images of spermoderm and surface
(c) histology
(d) bibliographic references, which seem to be mostly treatises on
   microscopy of plants and some on detection of adulteration.

The emphasis of the book seems to be on detecting adulteration, not on
identifying critters found in the food. There is some discussion of
critters at the beginning of the early chapter on grain, but not in
the chapter on legumes, which contains the stuff on chick peas. In
the discussion on insect and animal contamination of grains, they
cite a bulletin from 1896 from the US Dept of Agriculture, and mention
the following:
(i) Granary weevil (Calandra granaria L.)
(ii) Angoumois grain-moth (Sitotroga cerealella Ol.)
(iii) wolf-moth (Tinea granella L.)
(iv) Mediterranean flour-moth (Ephestia Kuehniella Zell.)
(v) Indian (maize) meal moth (Plodia interpunctella Hbn.)
(vi) meal snout-moth (Puralis farinalis L.)
(vii) confused flour-beetle (tribolium conjusum Duv.)
(viii) rust-red flouor beetle (tribolium ferrugineum Fab.)
(ix) slender-horned flour beetle (Echocerus cornutus Fab.)
(x) small-eyed flour beetle (Palorus ratzeburgi Wissm.)
(xi) yellow meal-worm (Tenebrio obscurus L.)
(xii) saw-toothed grain beetle (Silvanus surinamensis L.)
(xiii) red or square-necked grain beetle (Cathartus gemallatus Duv.)
(xiv) European grain-beetle (Cathartus advena Waltl.)
(xv) cadelle (Tenebroides mauritanicus L.)
(xvi) sugar-mite (Lapisma saccharina)
(xvii) common flour-mite (acarus farinae)
(xviii) feathered mite (Acarus plumiger)
(xix) wheat-worm (tylenus scandens Sch., Anguillula tritici Need.)

They cite Boehmer ("Die Kraftfuttermittel, ihre Rohstoffe, Herstellung,
Zusammensetzung, Verdaulichkeit und Verwendung, mit besonderer
Beruecksichtigung der Verfaelschungen und der mikroscopischen
Untersuchung", Berlin, 1903) and Chittenden ("Some insects injurious
to stored grain", mentioned earlier) for figures and descriptions
for identifying these species.

Regarding the saw-toothed grain beetle  (xii, above), I know someone
who purchased some crackers close to the pull date, found some critters
in the box and called customer service, who asked her if they fit a
certain description and then told her they were saw-toothed beetles.
Since the crackers were presumably cooked, that seems to indicate
that cooking the foods in question doesn't necessarily kill the eggs.

I think a book or article I read on eating insects claimed that the
average American consumes about 90 pounds of insects annually without
knowing it. Maybe the abundance of insect eggs is what really accounts
for the seemingly high figure of 90 pounds.

Before I invest too much effort in following up on the references cited
by this century old and not entirely appropriate book of Winton and Moeller,
is there some other reference work that would be better to use?

Also, am I correct in guessing that the scientific names (i)-(xix) are all
obsolete by now?
Signature

Ignorantly,
Allan Adler <ara@zurich.csail.mit.edu>
* Disclaimer: I am a guest and *not* a member of the MIT CSAIL. My actions and
* comments do not reflect in any way on MIT. Also, I am nowhere near Boston.

r norman - 06 Jan 2005 21:49 GMT
>> You probably don't want to examine too closely any raw plant material
>> that you plan to eat.
[quoted text clipped - 61 lines]
>Also, am I correct in guessing that the scientific names (i)-(xix) are all
>obsolete by now?

Scientific names are supposed to stay forever, unless they are
discovered to be in error (the same species was previously identified
using a different name or the name selected is already in use).

Try googling on "Insects in Food".  Make sure you keep the quote marks
in the search to search for that specific phrase.   Otherwise you get
over 2 million hits just using the words 'insects' and 'food', many of
which are about using insects as food.

There are a tremendous number of different species of insects that it
could be.  You also don't know whether the infestation occurred
naturally on the chick pea plants or whether it occurred during
storage, processing and handling on the way to the store or at the
store, or even whether it happened after you brought the stuff home!

If you are really interested  you can contact your local Agricultural
Extension Service for more information and perhaps help in
identification.  See
 http://www.oneglobe.com/agriculture/extnsion.html
 
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