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Abgeschickt von Michael Weinert am 14 Oktober, 2000 um 08:06:13
Antwort auf: Fungus gnat larvae on orchid roots von Kathleen Donham am 16 September, 2000 um 07:46:07:
According to my knowledge fungus gnat larvae normally feed on fungi in the soil and on dead organic matter. Only if they are running out of food (or if the population density is very high) they attack living plant tissue (especially soft tissue like root tips). They like high humidity and dense, decaying composts. So their appearance has nothing to do with the orchid roots but with the physical and biological characteristics of the soil.
I hope this helps