That is spidermites not thrips.....thrips are easier to spot than spidermites which often require a magnification. thrips also have a distinct pattern to the way they eat leaves. So when you cant get a visual on the perp.... detective work comes into play. and the way I see leave patterns is spidermites are very spotty and millions of small specs will form...... where thrips damage will take on a larger more burrowed look to its spotting.
Spidermites: eat....then move ....then eat..... then move
Thrips:......... eat and move and eat and move......
