Anzeiger für Schädlingskunde, Pflanzenschutz, Umweltschutz (1994) 67, 156-161

V. Skuhravý (1994)
On the differences between Thecodiplosis brachyntera Schwäg. and Thecodiplosis japonensis Uch. et in. (Diptera, Cecidomyiidae) on the genus Pinus
Anzeiger für Schädlingskunde, Pflanzenschutz, Umweltschutz 67 (5), 156-161
Abstract: The main differences between Thecodiplosis brachyntera (Schwägrichen) and T. japonensis Uchida et Inouye in morphology, bionomics, host plants, ecology, population dynamics, distribution, parasites, economic importance and control methods are given in this paper. The area of T. b. on Pinus sylvestris is more than 10 times larger than that of P. j. on P. densiflora and P. thunbergii. The flight period of adults and the length of the first instar larvae of T. b. is about 4 times shorter than those of T. j. Both species can be transferred (infestation) to other Pinus spp. Death of Pinus trees attacked by T. b. was never observed in Europe. The influence of air pollution may change this situation. T. japonensis caused death of Pinus trees. Thousands of hectares of forests had to be felled. Parasites and predators are important in controlling the population densities of both species, but in practice biological control was only used against T. j. Studies of chemical contents of needles and larvae produced interesting data on both species. T. brachyntera has been studied for 150 years and T. japonensis for 50 years.
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Link to article at publishers website

Research topic(s) for pests/diseases/weeds:
identification/taxonomy
review

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Thecodiplosis japonensis	Pine (Pinus)
	Thecodiplosis brachyntera	Pine (Pinus)