Fruit Fly Culture Experiment

I started making my own fruit fly culture right from the very beginning. It didn't occur to me that I could by a powdered product off the shelf until I accidentally came across it one day. I thought my only option for buying it was to buy another culture with flies already in it. Fly cultures are expensive, the only place in my city where I have found them charges $14. And they don't always have the type of fly that I want. There are two that are regularly available, the big ones with wings and the smaller ones without. I find the larger flies more useful for most of the things that I feed, and flies without wings are just a little strange. Anyway, months after I started making my own fly culture I tried the powdered repashy stuff.  I don't particularly like the smell of it, but it seems to work well. But how well? I have wondered all along if it is any better than my homemade stuff (the recipe is not mine originally, it was an internet find). So I decided to do a simple experiment. I made up a bash of Repashy, according to the instructions, and placed 3/4 of a cup in the bottom of a deli cup, and then thawed out a batch of my own mixture and placed 3/4 of a cup of it in the bottom of another deli cup:

I left them sitting for a few hours so the temperature would be the same. Then I took some of calcium powder that people use to increase the vitamin content of feeders and added flies.  This allowed me to subdue the flies long enough to count exactly 20 flies into each culture. Now we wait. My questions are these: is my homemade mixture as mold resistant over the long term, which culture retains moisture better, and which will produce a greater number of flies.  Of course I may not have an ideal mixture of males and females in each cup, which could impact the production numbers.

Update:  Well so far the experiment has been a complete disaster.  I always thought that the calcium supplement powder was no big deal to fruit flies, that they just cleaned it off themselves and went on happily with life, but apparently it's fairly lethal to them. They all died, in both containers, except for two.  So, using the same culture, I am going to throw in a much rougher estimate of 20 or so flies into each one, and try again.  Boo.

Update Number 2: Well again this did not goes as expected at all.  My home-made culture did very poorly, developing a lot of mold and killing off the flies.  This seemed very weird at first, because I use this stuff all the time, and have never had any trouble with mold.  I think what's different this time is the small number of flies that I put in.  I think the flies themselves, and their use of the culture, prevents the mold from growing. The repashy of course, produced the usual amount of flies.  Well, I didn't manage to prove that my home made culture is just as good, which was my intention. Clearly under some circumstances it is not. However, it is what I use most of the time, and it works really well at a fraction of the price, so I will keep using it despite the abysmal outcome of my little experiment.

From Pests to Pets

In October/November my wife found a three maggots in Brussels sprouts that she bought from the grocery store.  Foolishly she didn't even mention the first two.  How could she think I wouldn't be interested in such an awesome find?? When she found the third one while I was standing close by, I was more than ecstatic.  It looked like a normal fly maggot, except it was greyer, and a little larger.  I took the maggot with it's sprout and put it on some fruit fly culture and stuck it in a warm spot, and basically forgot about it.  Then one day I noticed a buzzing sound, and there was such a pretty fly in the container where the maggot had been. I don't think I have seen such a pretty fly before. This led to quite a lot of research and the discovery that the fly was probably a Delia radicum, commonly known as the cabbage maggot.

I went back to the grocery store where my wife had bought the sprouts and bought a lot more of them, and searched and searched for more maggots to no avail. Then I went to more grocery stores, looking for the grossest, oldest sprouts I could find. At the checkout in one grocery store the clerk said "I am sure we have better ones than those, would you like to get some different ones?"  The question here is, do I tell her I am looking for maggots? Probably not.  I replied "I like them like this, the older the better" and just grinned maniacally at her.

Still no maggots. So I go on Facebook, asking all my friends to check their Brussel Sprouts for maggots for me, and I even go so far as to put an ad on Kijiji.com offering to pay for live maggots from Brussel Sprouts.  You think that would work wouldn't you? Nope. The maggots and the beautiful fly they produce are now just a distant dream. Sigh.

So of course, I moved on. Hornworms are a common pest of Tobacco and Tomato plants. These suckers eat plants that would make the rest of us quite sick, members of the deadly Nightshade family of plants. As well as being pests, they are now very popular in the pet trade as feeder worms for reptiles. I thought to myself, these would make an interesting pet. They are fast growing and turn into beautiful moths. Off to the pet store in search of these guys.

I got two big fat ones at the local pet store. The down side is, like many caterpillars, they are very particular about what they eat, you can't exactly feed them iceberg lettuce. Fortunately the store that sold me the Hornworms had some "Hornworm Chow", but they wouldn't sell it to me, and gave me only a small amount.

Fortunately one of the worms wasn't interested in eating anyway. It was roaming around ignoring the food and had a pulsating aorta on it's back, a sign that it was ready to pupate. I plopped it on top of some moist soil and it immediately burrowed in.

Hornworm butt rapidly disappearing.

The other worm is eating up the little bit of chow that I have, and hopefully it to will be ready to pupate before I run out.  Unlikely since it ate 1/4 of what I had in the first 15 minutes.  These guys are just eating machines! But how pretty they are, and weird, kind of space-alien like.  I can't wait to see the moths that emerge. At 2 dollars a piece, they are pretty expensive feeders, but awfully cheap pets!

In one end, out the other. Food and poop.