Thecodiplosis japonensis
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Thecodiplosis japonensis Uchida & Inouye, 1955 - (pine needle gall midge)
This gall midge is an important pest of pine trees in Japan, Korea and China (e.g. Duan et al., 2021). Various outbreaks have been recorded which often result in defoliation. The outbreaks can extend over thousands of hectares and unlike in the European species, Thecodiplosis brachyntera, the damage often leads to tree mortality.
In spring, the adult midges emerge from the pupae in the ground. They usually live for only one day. After mating, the females lay eggs on the emerging young needles and the larvae feed at the base of the needles, forming galls. The larvae live gregariously inside the galls and more than 20 larvae have been recorded in a single gall. Development of the larvae is completed in autumn and the mature larvae drop to the ground, bury into the soil and overwinter in a cocoon. They pupate in early spring.
| Vernacular names | |
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| • Deutsch: | japanische Kiefernnadelgallmücke |
| • English: | pine needle gall midge |
| • Français: | moucheron de la galle du pin |
For a review see EFSA Panel on Plant Health (2022).
