In a previous post, I talked about a so-called “Oak Tree Effect“, in which citrus located near oak trees show essentially no pronounced symptoms of greening disease, while citrus further away from the oaks show severe symptoms. As always, when you first find something like that, you have to wonder whether or not it’s an anomaly. Well, I found even more examples of this effect.
Plus, a researcher at the University of Florida mentioned to me yesterday that he’s seen this effect in another grove he visited recently. Others have noticed that citrus trees growing under shade show fewer greening symptoms as well. We don’t know enough yet for this to result in any commercially useful practices, but it’s definitely a situation worth watching.