I have many, many pears on quince.  That's mostly because it's so easy to stick a quince cutting in the ground, and it becomes a tree.  I have noticed over the years that many of them look a little bit yellow.   I know one, really outstanding orchardist from HOS, who is not active on this list, who had a difficult time getting production out of his pears on quince.  I have quite the opposite effect.   When notice my trees looking kind of yellowish, I apply nitrogen in the most convenient form I know: urea.  It has always improved the condition, although it often takes a few weeks or even months.  I am wondering if this was his problem, although since we no longer really have in person meet ups with HOS, I don't know if I"ll ever see him again.  Have any of the rest of you noticed this effect?

Thanks,
JOhn S
PDX OR