Good day all, wondering if someone could help me out. My cucumbers are absolutely pathetic this year; not entirely surprising given our cold, wet summer so far in Southern Ontario. However, the plants are displaying symptoms of a deficiency of some sort. The leaves are very bright green to yellow, and the edges appear to be unusually "serrated".

My initial thought was iron deficiency?

Seeds were planted into mounds, with quite a bit of composted manure, peat moss and a complete organic fertilizer (alfalfa meal, lime, bone meal). There has also been a foliar application of liquid fish and liquid kelp.

Hoping someone can help.

Thanks,

Michael