When the tree is cold its roots are unable to absorb enough nutrients to keep the leaves green so they turn yellow. The leaves die and fall from the tree, which increases the tree's chances of being damaged by cold or attacked by other pests or diseases. Messages: 826 Likes Received: 10 Location: Pensacola, USA. Meyer Lemon Leaf Spots. Can you diagnose my potted Meyer lemon tree, which is now indoors over winter? Greasy spot is a fungus, known as Mycosphaerella citri, that affects the leaves of citrus trees and thrives in tropical and subtropical climates. Over the last couple weeks, it has gone from developing yellow spots on some of the leaves to dropping leaves. Aphids consume the Meyer and leave behind honeydew (sticky, black soot) which then feed the ants. Lemon trees prefer a warm subtropical climate, but grow in cooler climates if sheltered from cold winds and cold winter conditions. Asked January 19, 2018, 4:47 PM EST. 3 years ago . This year the tree has black leaves and a few black lemons. Michael. The fungus appears as yellow, dark brown, or black lesions that initially occur on the underside of mature citrus leaves. This is why you may encounter pairs. They chew up entire branches of leaves and can leave your Meyer tree bare. The tree grew well and we had many big & juicy lemons. Hello, I have a several year old potted Meyer Lemon that has developed some sort of ailment. HOPELR, May 27, 2007 #1. skeeterbug Active Member. Shelter lemons from cold winds with plastic, a screen or a hedge. Greasy spot fungal spores germinate on the lower leaf surfaces and create blisters in the spots where they attack the leaf tissue. They work together to feast on your tree. Meyer Lemon Yellow Spots/Blotches on Leaves, Dropping. What happened and what should I do? The leaves have developed dark blotches that appear to begin on the underside and spread through to the top, along with some yellowing. If you notice huge chunks missing at a time, it could very well be a rodent or animal like a deer. Some leaves have dropped. If you currently have or are looking to add lemon trees to your garden or landscaping, you want to make sure that you know how to properly care for and protect them. On the upper leaf surface, yellow spots turn into greasy-looking, raised dark brown blisters. As the fungus develops, the spots become visible on the leaf top. Discover some of the most common Meyer lemon tree diseases below. (There is also a fungus gnat problem—not sure if that’s related.) Citrus trees are absolutely beautiful and one of the most popular is the Meyer lemon tree. Even citrus trees aren't immune to disease. Skeet skeeterbug, May 27, … There stood a small, sad looking tree that was pretty hard to spot as being a Lemon tree, because it was absolutely covered in a thick, black, sticky coating on all of it’s leaves. 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