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The leaves on my 1 year old avocado plant are showing some weird almost dusty grey spots near the veins.

The leaves stay like this for a while, then they start to curl inwards/down get really crispy and fall/break off from the plant.

The plant only survives because it's growing new leaves very fast. I'm however afraid it will not keep up during the winter.

Is this some sort of fungus or mites, or something else? enter image description here enter image description here

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    I think you need to look with a magnifying glass - under magnification, its impossible to see from these images what they are clearly, but most likely a sap sucking insect of some sort because of its distribution along veins in the leaf. Scale, mites, aphids, that sort of thing - does anything fly up in the air if you disturb a leaf or do these stay fixed in position? – Bamboo Nov 20 '17 at 21:15
  • I will try and look under magnification! When I disturb the leaf nothing flies away. They stay in the same position, i can only rub them away. – Kevin S Nov 25 '17 at 20:01
  • Not aphids then... – Bamboo Nov 25 '17 at 20:12
  • I spotted some white spider like insects on some other leaf, just a few 3/4. They don't seem to move. Could not take a picture of them because they are really small. The veins also seem to be going brown after a while. Could it be mites, what are the grey dusty spots children? – Kevin S Nov 27 '17 at 21:52
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    If its spider mites, you can usually see some bits of webbing, fine and minimal albeit, but they should be visible. To be honest. I'd hit it with some neem spray, particularly spraying underneath the leaves as well as the top, and repeat it a few days later if you see anything else. That enlarged image definitely shows eggs, doesn't it, and they may hatch out after you've treated with neem, so keep a check on it. – Bamboo Nov 27 '17 at 22:31

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