Voltinism

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Voltinism

 

the ability of many insect groups to produce from one to several generations a year. Species producing one generation a year are called univoltine species; those producing two generations are bivoltine; and those producing several generations, polyvoltine. Some univoltine species are, for example, flea beetles, most of the Acridoidea, and cereal shield bugs. The codling moth and large white cabbage butterfly are univoltine in the north and polyvoltine in the south of Russia.

The ability of the Chinese silkworm to produce from one to seven or eight generations (harvests of cocoons) a year is one of the characteristics by which silkworm varieties are distinguished. The butterflies of bivoltine varieties are smaller than those of univoltine varieties, and the quality of the cocoons spun by the caterpillars is lower, but the bivoltine varieties are quick to mature and are hardy. Crossbreeding bivoltine varieties with univoltine varieties which yield higher quality silk results in new silkworm breeds distinguished by high viability, large cocoons, high silk yield, and good technological qualities of their silk.

REFERENCES

Mikhailov, E. N., and P. A. Kovalev. Selektsiia i plemennoe delo v shelkovodstve. Moscow, 1956.
Uchebnaia kniga shelkovoda. Moscow, 1966.
Bei-Bienko, G. Ia. Obshchaia entomologiia. Moscow, 1966.

P. A. KOVALEV

References in periodicals archive ?
fluminea in Lake Tahoe is univoltine, with reproduction in the late summer and low abundance of brooding veligers.
The species occurring in temperate or colder climate zones are assumed to have a univoltine life cycle and to hibernate as eggs.
For example, Kormondy & Gower (1965) found Epitheca cynosura to be semivoltine (bivoltine) in Pennsylvania, while Benke & Benke (1975) found the same species to be a univoltine spring species in South Carolina.
salicaria and has a univoltine life cycle (Blossey and Schroeder 1995).
Western corn rootworm [Diabrotica virgifera virgifera (LeConte)] are univoltine (single generation per year) and have 3 larval developmental stages (Krysan, 1986).
Allonemobius fasciatus is found north of 40 [degrees] N latitude in North America, and has a short development time, a univoltine life cycle, an intense diapause, a long ovipositor, and large eggs.
dorsalis was completed in 273.5 days, which characterizes this species as univoltine. Adults of L.
These authors noted the presence of adults Aiolopus strepens for most of the year with only one generation per year (univoltine) in imaginal hibernation.
Trirhabda beetles are univoltine, with eggs oviposited in the litter beneath goldenrod ramets hatching in late spring (Balduf, 1929).
variegatus is present throughout the year in two univoltine populations which have unequal abundance and duration (Messi et al.