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Bug of the Week: More Flies and Stinky Flowers

Believe it or not, flies are not my favorite insects, but there is an abundance of them in my garden right now. Do I have garbage out there? No, some very unusual flowers are attracting the flies, like the flower shown here. If you were sitting where I was to take this photo, you would think there was a garbage pile nearby. The odor was quite unpleasant.

euphorbia

This plant is a succulent in the genus Euphorbia. The plant deceives carrion and dung flies by producing odors that mimic decay. The flies are expecting to find some yummy rotting flesh or droppings to eat and lay their eggs on, but instead only find a devious plant.

Here is a fly that has been tricked:

fly on euphorbia

As it turns out, another similar plant is also flowering in my yard this week. This plant has bizarre red, star-shaped flowers. It is called Stapelia. It also mimics carrion.

flystapelia

Here is a green bottle fly that has been fooled. I have often seen thin white eggs in the centers of the Stapelia flower, laid by confused flies.

Take a look at this close up. You can see the pollen on the bottle fly’s thorax (behind the head). These plants are misleading the flies in order to be pollinated, and it seems to be working.

greenbottlefly

Carrion-mimicking flowers can go to real extremes to attract their pollinators. Two of the largest flowers in the world are big stinkers. The Rafflesia flower can be three feet wide, making it the biggest flower. The titan arum is definitely the tallest, reaching up to seven feet! Check the Library of Congress for some amazing pictures.

Hopefully the backyard jungle will smell better next week.

Becoming a Scientist

Some of you may have been wondering how watching birds (from weekend science fun this week) could be science. As I mentioned earlier, observing is an important science skill. Many famous scientists and inventors started out by observing nature, for example Leonardo da Vinci.

I have spent a lot of time recently thinking about how people become scientists. There seems to be a pattern that the interest is developed at home, usually from interacting with a parent or close relative. But a curiosity about the natural world also seems to be a factor.

If you have some time, listen to the podcasts at Ask-A-Biologist, or read the transcripts. The host of the series asks many of his guests about their path to becoming scientists. The answers are quite illuminating.

Bug of the Week Update

Just went out to check the aphids on the asparagus fern from last week. As I predicted, the aphids have virtually disappeared. I saw a few at the very tips of a couple of plant stems.

Insects have definite seasons and cycles, and it is worthwhile to pay attention to them. It can save you money, time and effort if you realize the pests are going to go away on their own.

Ants are particularly known for this. I think one reason there are so many wacky home remedies for ants is because people do something and when they check again, the ants are gone. The thing is, ants are highly mobile and it is likely they would have moved even if the homeowner had done nothing. (That isn’t to say there aren’t some useful home remedies, because there are.) When it comes to insects, being a procrastinator can really pay off.

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