After they had been outside throughout the summer, I brought my citruses inside. I've been having them for a couple of years and this is the first time I observe so much leaves being dropped. On the lime tree, they just go yellow and on the lemon tree, they wilt first and then drop. I also have kumquat tree which doesn't show any problems.
I don't believe that's because of too much watering since I've learned that lesson by loosing few trees, so I keep the soil on the dry side.
Indoor humidity has fallen to 50-60%. Could that be due to too dry air? Should misting help? Or it is a sign of nutrient or sun/light deficiency?
Any suggestion is more than welcome!