Q.lemon tree leaves sticky
plant kept in conservatory facing south west

Downtoearthdigs
Answered on May 29, 2015
Most likely caused from a scale bug infestation.
Neem oil is good treatment but you can make a insecticidal soup also.
You may want to check all your plants and quarantine your Lemon Tree.
Here is a few links to help you.
https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
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