Jon noticed 1–3 fungus gnats in dried LFS-potted Nepenthes and asked about 1:4 dilution of 100% neem oil as soil drench vs. foliar spray, concerned about root damage.
Jeff Dallas has used neem as foliar spray only. Research shows mixed opinions on soil drenching; with plants already stressed, he advised against it.
Place a dunk in watering container—releases Bacillus thuringiensis israelensis toxins over 30 days. Targets only mosquitoes and fungus gnats. Used routinely in Sarracenia Northwest's Sarracenia pools and winter Nepenthes greenhouse. Example product.
Good Growing!
Jeff Dallas
Sarracenia Northwest
www.growcarnivorousplants.com
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