I have bad eyes so I draw a ring around the ball(a putting line that goes all the way around). It seems to work for me year round. A friend of mine swears by the cally soccer ball golf balls. But I love a yellow dt with the black line all the way around.

That's a good question but the problem is that one leaf can hide a ball never mine hundreds!!!! This time of year I try to pay more attention with course landmarks in the direction the ball goes. I also make sure to play balls that I've put aside after playing many rounds with them. That way not such a big deal when loosing in the leaves. Most important!!!! Don't forget the leaf rule. No penalty for lost in the leaves! LOL!!!

I would suggest 2 or 3 thick black lines, that is what I do because leaves that fall are usually red, green, yellow and black will stand out from them and so will a thick line in case part is under a leaf and part is not, it is big enough to be seen from a few angles! Hope this helps. Hit em straight

The pine needles fall the year round in the south and I do my best to avoid hitting the ball into the trees, with respect. Might try a yellow ball. DT TruSoft. But if it lands under a leave good luck. We do have some other tree that start shedding their beautiful leaves in October along the coast. Can be a burden. Our grounds crew does a pretty good job a keep the leaves blown back away from the rough, so you need to hit it pretty deep.

Hey Matt, I feel your pain. Here in South Jersey we have the same problem. We blow leaves at my course every day. By 9:00am, you Can't even tell we blew them. I just carry extra balls. Of course I find them by the dozens.
Play Well,
Steve S.

Personally I mark my balls the same no matter what time of year, but the more unique the mark, the better.

I mark them the same way as I always do, with a red dot. But I'm with Bob T on this. Play with balls, that has been around the course sometimes, then it doesn't hurt as much, if you can't find it :-)