Stem Gall

At some point I will get back to doing longer posts but for today I give you another photo from my Grandma's garden.

Now this may look like an apple but looks can be deceptive. In fact this is a stem gall.

Galls are formed by a plant in reaction to an irritation usually caused by an insect. Unfortunately I don't know what insect was responsible for this gall but it must have caused an awful irritation as it was quite a big gall.