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Pear pollination

Nibbled pear flowerLast week, I mentioned that our pear flowers were mostly being overlooked by pollinating bees, with all of the buzz centering around the peaches instead.  Since then, the peach flowers began to decline and the pears opened more fully, which did attract a few more bees to the pear blooms.  But beetles were still the primary pear pollinators.

As with most of ecology, the story is complex.  It turns out that nectar has varying sugar concentrations depending on the plant species, with one source listing the following averages:

  • Apple - 46.2%
  • Peach - 28.9%
  • Scarab beetles: HopliaPlum - 25.8%
  • Sour cherry - 23.5%
  • Pear - 9% (with other sources listing 4% to 25%)

Of course, sugar concentrations vary by variety as well, and are also affected by weather.  Low humidity leads to more sugar in nectar while high humidity waters down the kool-aid.

But all else being equal, you can see why a bee might prefer a peach flower to a pear flower (and why lack of pollination is a problem in many pear orchards).  That said, pear flowers produce large quantities of pollen, so honeybees rearing brood might spend time on there.

Paria beetle

Beetles don't seem to mind the lower sugar content of the pear blooms, perhaps because most beetles visit flowers primarily for pollen.  Whatever the reason, I continued to see lots of different kinds of beetles on my pear flowers, along with the holey petals and leaves Beetle pollinationthat are the by-product of these "mess and soil pollinators".

Bugguide.net users tentatively identified the beetles in my second photo as Hoplia (usually considered a pest since it eats rose blossoms, but seemingly doing pollinating work here) and those in the third as Paria.  I didn't try to ask for an ID on this last beetle because I couldn't zoom far enough in.

As a side note, I was interested to read that fire blight bacteria are hindered by high sugar concentrations in nectar, which is probably why pears are the most frequent victims of the illness.  Perhaps pear varieties resistant to fire blight have sugar concentrations greater than the threshold 20 to 30%?

Our chicken waterer keeps hens happy with POOP-free water.


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Nice one. You are an example of a post-secondary education put to good use, IMHO, because you're living well in the world with your knowledge and skills, and also sharing with others. I just comment in this way because I'm preoccupied these days with what we should be learning (as adult learners, and what to teach kids) as we go forward into an uncertain future... I'm doing an organic farm intership this summer, and I'm all about the "practical learning" but you remind me that real knowledge and study matters, too. Do I need to go back to university, though? I think you guys are the rural, internet-savvy autodidact i.e. "the new black" when it comes to adult learning.

Comment by J Mon Apr 2 11:43:15 2012

J --- I think that education is important for two reasons:

  • To teach you how to think critically

  • To learn how to look things up (and tell which sources are trustworthy)

You might get that in high school, college, or just in life. (And if you're not learning that in school, there's no reason to be there, in my opinion.)

After that, it just seems more efficient to learn on your own. That way, you can focus on the topics that really interest you. I started a master's a few years ago, but gave up on it because it wasn't focused on exactly what I wanted and I realized I'd rather spend my time reading and experimenting in a more focused manner!

Comment by anna Mon Apr 2 19:01:54 2012

Excellent philosophy, Anna. You're one of the few who has it figured out correctly. The purpose of formal education is not to teach you material per se, but to teach you how to learn and to think critically. Apprenticeships are for learning the details.

As for blossoms: we've had a very warm, early spring here- the blossoms on the pear & apple tree are unusually abundant, but 4 weeks early, and there's very few insects out and about yet. I'm wondering if the crop will actually be good or bad this year. Timing is everything.

Comment by doc Wed Apr 4 07:58:36 2012
doc --- I hope your trees get pollinated somehow! It's been very rainy during our apple's bloom span so far, so I'm keeping my fingers crossed the bees will find it.
Comment by anna Wed Apr 4 13:49:19 2012

One very unique homestead, $1,500 per acre, the opportunity of a lifetime