Rose midge

Tiny white maggots (1mm long) feed inside developing rose buds, causing deformed, blackened terminals that abort before opening. Affected shoots show twisted growth and fail to flower, leaving healthy rose bushes with abundant foliage but no blooms; this is the key diagnostic symptom in Western Washington gardens. Rose midge completes one life cycle every 12-16 days in warm weather, resulting in two damage peaks in late June and late August.

Find larvae using magnification clustered between petals and sepals at bud base. Remove and destroy infested buds immediately. Deadhead regularly to remove flowers where late-generation midges develop. Maintain moisture and avoid excess nitrogen that encourages susceptible growth.