Pests and Diseases forum: Why are the leaves on my mint plants withering at the bottom?

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Barcelona, Spain
Apr 13, 2016 1:42 PM CST
I was wondering why the leaves at the bottom of my mint plants started turning yellow? See photos:

Thumb of 2016-04-13/Gabe1982/23482b
Thumb of 2016-04-13/Gabe1982/1e6e25

There are also some weird spots on some of the leaves that are healthy:

Thumb of 2016-04-13/Gabe1982/05c05d

I water these mint plants a lot. Meaning I water it with 3-4 pints of water in a go and that water stays in a tray that I have under the pot. It should be the issue though. The entire plant looks healthy at the top.

Any help will be appreciated.

Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Apr 13, 2016 4:39 PM CST
The silvery patches on the lower picture may well be caused by an insect but I don't know what sucking insects you have there. Maybe a leafhopper? Have you seen any pests around the plants?

When the oldest leaves die on a plant it can be normal, but I'm not sure in this case. Have you checked the underneath of the leaves for spider mites?

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