What are the known scoring techniques and standards of insect damage on plant leaf?

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Daniel Rüde

I often see in papers that the % consumed leaf area is visually estimated in classes, mostly 20% steps: class 1: 0%, class2: 1-20%, class 3: 21-40% ...

For some pests and plants there are scoring table, e.g. for Psylliodes chrysocephala feeding on oilseed rape, see here: https://images.app.goo.gl/9uKuxcXuXnYoQDfa6

You can also make pictures and the use software to measure the consumed leaf are, e.g. with the free app BioLeaf or with the computer programm ImageJ.

I think all of my mentioned approaches are quite standard.