Damage based identification key for endophagous herbivores on Common Reed (Phragmites australis) |
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| Author:
Patrick Häfliger © |
CABI
Europe - Switzerland, Rue des Grillons 1, CH-2800 Delémont |
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| "The
Silver-Haired Gall fly" Lipara rufitarsis Loew (Dipt.: Chloropidae) |
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Biology: Larvae hatch in May(June), enter shoots from the tip, and mine down through the growing point into the gall chamber formed by thickened, stunted internodes. Only one larva is found per shoot. End of July/August full fed larvae turn head upwards in the gall chamber and hibernate there. Pupation happens in April and adults emerge during May. Flies live about two weeks and lay eggs on shoot tips and leaves. Description: Mature larvae 6-8.5 mm long, light yellowish, feeding in gall internodes below growing point; pupae same shape as larvae, brown to yellow-brown; adults dark, 3.5-5.5 mm (picture 50). Feeding pattern/damage: Larvae induce shortening and thickening of new developing internodes. The resulting gall consists of 5-6 shortened internodes (picture 23). After July the growing point is always eaten through. Distribution: Europe, Asia, North America (introduced) References: Chvala et al., 1974 |
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