on Acer campestris
Last moments before adult definitive pigmentation takes on temporary white.
Unknown bugs on a apple leaf. Looks like they hatched from the eggs (not 100% sure). Shot with Canon 600D and Sigma 180mm Macro at closest focusing point.
Photo 2 = less photoshopping, color more natural.
At this location, 3 Morus alba (white mulberry/Witte moerbei).
1) On 2 of the 3 M. alba => several Brown marmorated stink bug (BMSB). On the third one I found these eggs
2) iNatuaralist proposes BMSB as most likely species
3) There is a previous recording of 11 BMSB nimf present on Morus alba, Botanical garden, Leuven, 2023-07-29 09:48
4) According to the publication "Host Plants of the Brown Marmorated Stink Bug in the U.S." "Morus alba" is one of the plants where the Brown Marmorated Stink Bug occurs in highest density.