Torymus druparum, the apple-seed chalcid, is a species of parasitoid wasp. The species is found in Eastern Europe, Western Europe, Central Asia, and North America.[2]
Torymus druparum has a bronze-green body and transparent wings. The primary part of antennae and legs (with the exception of the coxa) are a reddish yellow. The tarsi are a light yellow. The hindthighs have a metallic shine. Females are 3.5–4mm long, while males are 3–3.4mm long. The ovipositor is approximately 1.5 of the body length.[2] The female-to-male ratio of the species is approximately 3-to-1.[3]
Behaviouredit
Torymus druparum is a common parasitoid on seeds of apples, pears, Crataegus, and Sorbus. Within the apples, the eggs are inserted into the young seed through the micropyle when the apple is still small, with the larvae feeding on the kernel. T. druparum usually spends two or three winters in the larval state, though rarely emerging during the first spring as well.[2][4][5]
Within the human-cultivated apples, T. druparum is a frequent pest on Lady apples and crab apples due to their smaller size allowing easier penetration with the ovipositor. The only visible effect of infestation is caused by the puncturing of the skin by the ovipositor, appearing as a minute scar in a small dimple after a few days. In most cases, the fruit is able to outgrow the injury, however in rarer cases of sparse fruit or repeated puncturing, this can cause permanent dimpling and discoloured streaks on the flesh. It is also common to mistake infestating by other species (such as Lygidea mendax or Heterocordylus malinus) as being caused by T. druparum. Only the Lady apple is subject to heavy infestation: in a 1914 study, Cyrus R. Crosby found that two thirds of inspected lady apples were infested with the wasp. In contrast, in orchards containing Grimes Golden only a quarter of apples have been discovered infested, while only a single apple each of Ben Davis and Missouri have been discovered infested.[3]
^ abcNikolskaya, Mariya (1952). Хальциды фауны СССР (Chalcidoidea) [Chalcids in the fauna of USSR (Chalcidoidea)] (in Russian). USSR Academy of Sciences Publishing House. p. 117.
^ abCushman R. A. (1916). "Syntomaspis druparum, the apple-seed chalcid" (PDF). Journal of Agricultural Research. 7: 487–502.
^Crosby, Cyrus (1908-03-01). "Notes on a Chalcid (Syntomaspis druparum Boh.) Infesting Apple Seeds". Annals of the Entomological Society of America. 1 (1): 38. doi:10.1093/aesa/1.1.38.
^Crosby, Cyrus (December 1912). "Notes on Syntomaspis druparum Boh. and Ichneumon nigricornis Berger". The Canadian Entomologist. 44 (12): 365–366. doi:10.4039/Ent44365b-12. S2CID 87692695.
May 07, 2024
torymus, druparum, apple, seed, chalcid, species, parasitoid, wasp, species, found, eastern, europe, western, europe, central, asia, north, america, scientific, classification, domain, eukaryota, kingdom, animalia, phylum, arthropoda, class, insecta, order, hy. Torymus druparum the apple seed chalcid is a species of parasitoid wasp The species is found in Eastern Europe Western Europe Central Asia and North America 2 Torymus druparum Scientific classification Domain Eukaryota Kingdom Animalia Phylum Arthropoda Class Insecta Order Hymenoptera Family Torymidae Genus Torymus Species T druparum Binomial name Torymus druparum Boheman 1834 1 Description editTorymus druparum has a bronze green body and transparent wings The primary part of antennae and legs with the exception of the coxa are a reddish yellow The tarsi are a light yellow The hindthighs have a metallic shine Females are 3 5 4mm long while males are 3 3 4mm long The ovipositor is approximately 1 5 of the body length 2 The female to male ratio of the species is approximately 3 to 1 3 Behaviour editTorymus druparum is a common parasitoid on seeds of apples pears Crataegus and Sorbus Within the apples the eggs are inserted into the young seed through the micropyle when the apple is still small with the larvae feeding on the kernel T druparum usually spends two or three winters in the larval state though rarely emerging during the first spring as well 2 4 5 Within the human cultivated apples T druparum is a frequent pest on Lady apples and crab apples due to their smaller size allowing easier penetration with the ovipositor The only visible effect of infestation is caused by the puncturing of the skin by the ovipositor appearing as a minute scar in a small dimple after a few days In most cases the fruit is able to outgrow the injury however in rarer cases of sparse fruit or repeated puncturing this can cause permanent dimpling and discoloured streaks on the flesh It is also common to mistake infestating by other species such as Lygidea mendax or Heterocordylus malinus as being caused by T druparum Only the Lady apple is subject to heavy infestation in a 1914 study Cyrus R Crosby found that two thirds of inspected lady apples were infested with the wasp In contrast in orchards containing Grimes Golden only a quarter of apples have been discovered infested while only a single apple each of Ben Davis and Missouri have been discovered infested 3 References edit Torymus druparum Global Biodiversity Information Facility Retrieved 2023 03 19 a b c Nikolskaya Mariya 1952 Halcidy fauny SSSR Chalcidoidea Chalcids in the fauna of USSR Chalcidoidea in Russian USSR Academy of Sciences Publishing House p 117 a b Cushman R A 1916 Syntomaspis druparum the apple seed chalcid PDF Journal of Agricultural Research 7 487 502 Crosby Cyrus 1908 03 01 Notes on a Chalcid Syntomaspis druparum Boh Infesting Apple Seeds Annals of the Entomological Society of America 1 1 38 doi 10 1093 aesa 1 1 38 Crosby Cyrus December 1912 Notes on Syntomaspis druparum Boh and Ichneumon nigricornis Berger The Canadian Entomologist 44 12 365 366 doi 10 4039 Ent44365b 12 S2CID 87692695 Retrieved from https en wikipedia org w index php title Torymus druparum amp oldid 1209284131, wikipedia, wiki, book, books, library,
