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The drills are differentiated in the ascending and descending rose shoot drills. Both are the yellowish larvae of sawflies. The descending driller eats from top to bottom through the rose stem. The shoots wither and die. At the end of June and beginning of July, the larvae leave the stalks of roses through a well-visible drill hole to hide in the soil for winter storage. The ascending drills eats in the opposite direction, from below to the shoot tip, through the roses. The rose shoots suffer no major damage, they do not die.
Check the roses regularly from the beginning of May. Cut off infected shoots immediately and remove them from the garden (do not compost). The use of pesticides is not necessary.