Trichogramma


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Trichogramma

 

a genus of ichneumon flies of the order Hy-menoptera that parasitize insect eggs. The flies are small, measuring 0.3–0.6 mm, and range in color from pale yellow to brownish black. They parasitize 215 species from six orders, mainly moths and hymenoptera. The female lays 25–150 eggs (usually 40–60), depositing between one and 40 in each egg of the host, depending on the size of the host’s egg. Under favorable conditions, development lasts approximately two weeks.

In the USSR, T. evanescens is the most important species, as it parasitizes more than 100 species of moths, including the grain moth Nemapogon granellus, Barathra brassicae, Argotis segetum, the corn borer (Pyrausta nubilalis), and the codling moth (Laspeyresia pomonella). The insect sometimes destroys 90–100 percent of the eggs of destructive species. T. pallida is a parasite of the codling moth and some leaf roller moths, and T. pini feeds on eggs of the pine moth.

The most important species in the USA is T. minutum, which is used to control the codling moth, Grapholitha molesta, the sugarcane borer (Diatraea saccharalis), and Chilo simplex.

Insects of the genus Trichogramma have long been used to control crop pests because they are easy to raise in a laboratory and are polyphagous. However, despite a number of successful instances when the insects were employed, lasting positive results have not yet been achieved.

REFERENCES

Biologicheskaia bor’ba s vrednymi nasekomymi i sorniakami. Moscow, 1968. (Translated from English.)
Khimicheskaia i biologicheskaia zashchita rastenii. Moscow, 1971.

G. M. DLUSSKII

References in periodicals archive ?
Taiwan's fall armyworm (FAW) emergency response center said on Monday (July 15) that tiny Trichogramma wasps have proven effective in suppressing the growth of fall armyworms.
This season, however, things are looking up for farmers when it comes to controlling pests as the International Centre of Insect Physiology and Ecology (Icipe) and its partners work on insect-controlled method to curb the pests.Scientists at Icipe have identified two local varieties of wasps, Trichogramma and Telenomous, which they release in affected maize plantations to search for and lay their eggs on armyworm eggs thus killing them before they reach the larvae stage where they are most destructive to crops.
Tarim zararlilarina yonelik biyolojik mucadele calismalari kapsaminda 2014-2015 yillarinda Izmir, Manisa ve Canakkale illerine bagli bazi ilcelerde domates tarlalarinda bulunan zararli domates guvesi, Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae)'nin yumurta parazitoiti Trichogramma euproctidis (Girault, 1911) (Hymenoptera: Trichogrammatidae)'in yayilisi ve dogal etkinligi belirlenmistir.
The centers raise 9 million Trichogramma wasps yearly to combat insect pests in rice, corn, sugar cane, vegetables and pasture lands.
Comparative efficacy of eco-friendly methods involving egg parasitoid, Trichogramma japonicum, mechanical control and safe chemicals against Leucinodes orbonalis Guenee infesting brinjal.
My master's project focused on the design and testing of a boom sprayer to release Trichogramma pupae in sweet corn fields for biocontrol of the European corn borer.
Egg parasitoids of the genus Trichogramma (Hymenoptera: Trichogrammatidae) are the natural enemies that are most commonly used to control lepidopteran pests (Wajnberg & Hassan 1994; Parra & Zucchi 1997; Consoli et al.
Other parasitoids with potential include Trichogramma, a small wasp that feeds on insect eggs, which has native sub-species spread across the world.
Alem disso, os ovos de Sitotroga cerealella parecem ser mais rigidos que de Anagasta kuehniella, visto que Trichogramma evanescens Westwood (Hymenoptera: Trichogrammatidae) necessitou de tres vezes mais tempo para realizar a penetracao do ovipositor em Sitotroga cerealella comparado a Anagasta kuehniella (SALT, 1938).