I bought a meyer lemon tree from a local nursery 2 weeks ago, I planted it in a large terra cotta pot containing organic soil and a good amount of perlite for drainage... I have given it "fox farm peace of mind organic fertilizer", and spray its leaves with "Einstein" neem oil every other day.... I even purchased a water, light, and ph detector. My leaves began turning yellow at the petiole and vein several days ago. The petiole is still connected to the branches, but the leaves fall off so I assume the tree may be experiencing stress. I did see some leaf miners on several leaves, I promptly removed them... now I am beginning to think scale, I have posted several times to this site, all because of scale on previous plants/palms. Could it be my apartment deck? What do you think the cause of these lost leaves may be? I have included some pictures below... You can see that it is beginning to look terribly leggy. And also, should I wash the oil off of the leaves from time to time or can they still breathe?