Vine mealybug
growth and causing deformation and / or yellowing of leaves, sometimes followed by defoliation. The overall effect is a reduction of photosynthesis and therefore [...] the yield. Flowers and fruit often drop off. Plant sap is rich in sugars, but low in proteins. In order to gain an adequate intake of protein, mealybugs [...] stages: egg, first, second and third instar nymph, prepupa, pupa and adult. The eggs are golden-yellow in color and are deposited in an cottony egg sac (ovisac)