The privet is an extremely robust plant that rarely suffers from diseases or pests. If the privet suddenly gets yellow leaves that fall off in summer, you probably overdid it with the care.
If the privet gets yellow leaves, it can be caused by over-fertilization
Yellow leaves on privet due to over-fertilization
Although privet needs nutrients, it resents an oversupply. He responds by turning the leaves yellow and eventually dropping them.
So never overdo it with fertilizing. On a well-prepared soil, you hardly need to fertilize at all.
In order to encourage the privet to grow vigorously, you may add some compost and horn shavings (€32.93) in spring, or provide the shrub with long-term fertilizer. Only short-term fertilizers such as blue grain are given twice a year.
tips
If the leaves of the privet curl up and then fall off, you can assume an infestation by the privet aphid. This pest occurs more frequently, but is usually not dangerous to the privet.