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Originally Posted by Ollie  Hello Heidihig and welcome. Would there be any chance of you posting a photo of your cactus. It would really help if we could see it. The cotton wool like substance you say it started producing could be normal depending on the species. It's also fairly normal for cacti to look slightly unhealthy at this time of year as it is the winter rest period where the previous summers growth should be allowed to ripen by witholding water. This can, depending again on the species and the environement it's kept in cause a change in colour and a slight shrivelling of the plant.
The flies you mention could be compost flies, they do have a proper name but I can't for the life of me remember it. If your plant is indoors in a fairly warm temperature I would be inclined to give it a small amount of water.
Hope this helps a little
Roger |
Sciarid Flies are the group of insects you mention.