The GARDENA gardening expert
Dear Mr. S., these maggots are the larvae of the cherry fruit fly. They fly to the cherries when at the yellow stage of ripening, and each lay one egg, from which a maggot hatches. You can catch a large proportion of these flies with cherry maggot traps (e.g. manufactured by Neudorff). This should substantially reduce the fruit infestation. You can get rid of them entirely by planting varieties of cherry which ripen very early in the year in your garden. Here we speak of a ripening period in the first and second cherry week, lying approximately between the end of May and the middle of June. Varieties which ripen in this time window are for example the “Burlat”, “kassins frühe” or “Merton Glory”. These fruits ripen to the yellow stage when the cherry fruit fly is not yet mobile.