Which are the three most annoying destructive pests you have had to fight for in your cactus/succulent collection/nursery?

Mine are (in order from worst to less worst):

1. root mealy bugs
2. red spider mite
3. fungus

Thanks AnTTun, I think they sure are the worst pest in cactus and succulents.

Thanks for the nice info, Dave.

Thanks lobman and Dave. I wish I could preventively treat them with something not chemical, but for the root bugs, I've found that is almost impossible.

Ian, sorry I don't know the answer to your question.

Thank you very much for your responses and advice. I really appreciate them highly. Right now, I think I have my collection bug/pest free. I treated them with dimethoate once a week for 4 weeks. And been treating them once a month as a preventive treatment. In spite of the insecticide, I still neede...

I've always had trouble with root mealy bugs. Lost a few cactus to them. I have a 4x6 m GH with screen walls. Now, I'd like your opinion in how to avoid these bugs. I don't want to see a plant almost dying to recognize it's infected. What would be a good preventive program? Please, mention products ...

A warm welcome from Costa Rica!

Oh my, wonderfully delightful photos. Tough job ahead, Noel

CONGRATULATIONS, Noel! Well deserved! Gorgeous photo.

Nice to have you here