The amount of Wood effect isn't related to the colour of the leaves, as these two photographs show. First a pair of trees, of definitely different colour ...
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3HoLk9U1uhOWhiaOYWSbYYzxvKgxCChGG-GWJQkTpTAM1Xo9Qaozi1mf9INxzkLH-PQG3eBjRGZL4zSxIBnXdafsbCQ-E8_-IOXOKifaNDmtkFGkO2MI1QyyowHERa2K0Dh0lKFsR0vZd/s1600/IR-tree-comparison-2.jpg)
When you look at the same trees through a 720 nm filter you can see that they look basically the same ...
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgh2723fzNKA-dBcQRn30Y0AxUVGpsaXk-dLB5biQD5LoX5MCbTfQc3HqFzzhkd0U3ACvlLDq5OTj-kBTvAHZYN3PhAvYCQEj9hKNHBPSNgP47kfQpR8Urqyj2WcRIQKbKDIpqEbOpNg1RP/s1600/IR-tree-comparison-1.jpg)
Incidentally, the Wood effect happens in very deep red, rather than in true near-infrared. You can prove this if you have a 720nm filter. Go outside on a sunny day and look through the filter at some foliage. It will be very faint, but you will see the glow.