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Cannabis has over 300 known pests and over 100 diseases. Most of these affecting the yield do not cause economic loss (Barron et al. 2003).
Pests and diseases that may jeopardise the yield are the hop flea beetle (Psylliodes attenuata), European corn borer (Ostrinia nubilalis), hemp broomrape (Orobanche ramosa), hemp canker (Sclerotinia sclerotiorum), whose vector is wheat, and hemp rust (Melampsora cannabina) (McPartland, J. M., 1996).