Having recently settled in Spain we have inherited 6 assorted citrus trees, 1 lemon, 2 valencia & 3 navel.
All are afflicted with some sort of leaf curl pest which attacks the new growth & shows some brown tracks on the up side & some white mould beneath. Trees are semi-mature, about 12-15yrs & are still fruiting, but they don't look very well.
Any advice on what to treat them with would be helpful!
Soil here is light & free draining, climate is Mediterranean/Atlantic.

Regards, David.

Hi Palletts,
Welcome to the forum
It sounds like you might have a case of leaf miners. This is the larvae of a moth and is devastating for the leaves. If there are only a few leaves affected you can just remove them. If you have a heavy infestation you may need a horticultural oil spray. These are really hard to kill as they live inside the leaf where most pesticides are unable to reach. Systemics work but also get into the fruit. If you plan on eating the fruit never use a systemic on fruit trees. The oil spray will kill the larvae when it emerges from the leaf and will keep others from laying eggs in the leaves.
Andi

Hi David,
Welcome to the forum. I am new to this forum as well, but unfortunatly I am familiar with the Citrus Leaf Miner (CLM). As mentioned in the previous post horticulture oil works, but if you are in a region that experiences mild freezes, you may need to stop oil sprays 2-3 months before first frost so that your trees can become cold hardened.

There is one other pesticide that is not a systemic that is effective for CLM and it is spinosad. It is relatively non-toxic to humans and animals, but is toxic to bees. Spinosad is short lived with a half life of only a few days in most cases due to the fact that it decomposes in sunlight.

BTW-- What part of Spain are you from? My grandfather was from Spain just above Portugal.

Cdoc