Larva Chrysanthemum stool miner

This insect is associated with chrysanthemum stools and was formerly an important pest. Nowadays, however, owing to changes in cultural techniques and better hygiene procedures, infestations are infrequent. Chrysanthemum cuttings and lettuces planted in infested chrysanthemum stool beds are also attacked. Adults are normally active in May and June. Eggs are then deposited in the soil close to chrysanthemum plants. The eggs hatch about 2 weeks later. The creamish-white, shiny larvae mine within the stools to form long, but superficial, galleries. Pupation takes place in the soil 1-2 months later, and a second generation of adults appears in the late summer or autumn. Second-generation larvae feed throughout the winter and, under glasshouse conditions, usually give rise to adults by March. Adult flies are bluish-black, with the head and legs brownish-yellow and the bulbous third antennal segment mainly black (Fig. 253b) (cf. Psila rosae, p. 181).

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