Rory McIlroy hopes the PGA Tour bans players from using green-reading books, saying they have "made everyone lazier."
McIlroy is chairman of the Tour's player advisory council, and Golfweek reported Wednesday that the group voted two weeks ago to ban the guides beginning next season.
Asked about the report in a news conference ahead of the U.S. Open, McIlroy did not comment on it directly but made his feelings on the matter clear.
"Look, everything that's talked about in those meetings is somewhat confidential, but what I can say, I think -- I use a greens book, and I'd like to get rid of them," he said.
"I think everyone is in the same boat, most guys on Tour are in the same boat, that if it's going to be available to us and it helps us, people are going to use it, but I think for the greater good of the game, I'd like to see them be outlawed and for them not to be used anymore."
The books include illustrations that help golfers read putts from anywhere on the green and are currently available for every tournament except the Masters.
McIlroy called reading greens "a skill that takes time and practice to be mastered" and said he sees a difference in the way players approach practice rounds at Augusta National for exactly that reason.
"Honestly, I think it's made everyone lazier," he said.
"People don't put in the time to prepare the way they used to, and that's why you see so many more players at Augusta, for example, take their time around the greens, hit so many more putts, it's because they have to. It's because there is no greens book at Augusta.
"Look, it might make practice rounds a little longer, and you might have to do a little bit more work, but I think, once we get to the tournament rounds, it will speed up play, and I think it will help the guys who really have done their homework, it will help them stand out a little bit more."