Partial bivoltinism in a gregarious endoparasitoid: larval diapause as influenced by season and sharing a host

2020 ◽  
Vol 169 (1) ◽  
pp. 145-153
Author(s):  
Edward W. Evans
Keyword(s):  
Larval Diapause

scholarly journals Single and Double Infections with Wolbachia in the Parasitic Wasp Nasonia vitripennis Effects on Compatibility

Genetics ◽  
1996 ◽  
Vol 143 (2) ◽  
pp. 961-972 ◽  
Author(s):  
Marie-Jeanne Perrot-Minnot ◽  
Li Rong Guo ◽  
John H Werren
Keyword(s):  
Genomic Dna ◽  
Rapid Development ◽  
Parasitic Wasp ◽  
Pcr Amplification ◽  
Bacterial Strains ◽  
Nasonia Vitripennis ◽  
Larval Diapause ◽  
Wide Range ◽  
Reproductive Incompatibility ◽  
Infected Line

Abstract Wolbachia are cytoplasmically inherited bacteria responsible for reproductive incompatibility in a wide range of insects. There has been little exploration, however, of within species Wolbachia polymorphisms and their effects on compatibility. Here we show that some strains of the parasitic wasp Nasonia vitripennis are infected with two distinct bacterial strains (A and B) whereas others are singly infected (A or B). Double and single infections are confirmed by both PCR amplification and Southern analysis of genomic DNA. Furthermore, it is shown that prolonged larval diapause (the overwintering stage of the wasp) of a double-infected strain can lead to stochastic loss of one or both bacterial strains. After diapause of a double-infected line, sublines were produced with AB, A only, B only or no Wolbachia. A and B sublines are bidirectionally incompatible, whereas males from AB lines are unidirectionally incompatible with females of A and B sublines. Results therefore show rapid development of bidirectional incompatibility within a species due to segregation of associated symbiotic bacteria.

Diapause initiation and incidence in the millet stem borer, Coniesta ignefusalis (Lepidoptera: Pyralidae): the role of the host plant

2000 ◽  
Vol 90 (4) ◽  
pp. 365-371 ◽  
Author(s):  
P.B. Tanzubil ◽  
G.W.K. Mensah ◽  
A.R. McCaffery
Keyword(s):  
Host Plant ◽  
Pennisetum Glaucum ◽  
Stem Borer ◽  
Field Trials ◽  
Northern Ghana ◽  
Research Station ◽  
Coniesta Ignefusalis ◽  
Larval Diapause ◽  
Diapause Incidence

The role of the host plant in the development of larval diapause in the millet stem borer, Coniesta ignefusalis (Hampson) was investigated in northern Ghana in 1996 and 1997. Surveys conducted in farmers' fields in the Guinea and Sudan savannah revealed that of all the upland cereals grown, the insect survived the dry season only in stalks and stubble of pearl millet, Pennisetum glaucum and late sorghum, Sorghum bicolor. This observation was confirmed by results from field trials conducted at the Manga Research Station. In these studies, C. ignefusalis larvae entered diapause only in late millet and late sorghum, with a higher incidence in the former. The insect neither attacked nor entered diapause in maize planted during the same period as the other crops. Results from controlled experiments showed that diapause incidence in the preferred host, millet, was higher in older than in younger plants, suggesting that host plant maturation is a key factor influencing the development of larval diapause in C. ignefusalis.

scholarly journals Description and biological features of a new species of Anagrus Haliday (Hymenoptera, Mymaridae)

Entomologia ◽  
2014 ◽  
Author(s):  
F. Nugnes ◽  
G. Viggiani
Keyword(s):  
New Species ◽  
Life Cycle ◽  
Quercus Ilex ◽  
Biological Traits ◽  
Larval Diapause ◽  
Biological Features ◽  
A New Species

Anagrus lindberginae sp. n. (Hymenoptera: Mymaridae), an egg par- asitoid of the leafhopper Lindbergina aurovittata (Homoptera: Cicadellidae), is described from Italy. It is included in the atomus group of Anagrus Haliday and compared with the allied known taxa. The parasitoid’s life cycle is characterized by a long larval diapause from spring to fall, which allows for synchronization with its leafhop- per host; other biological traits of A. lindberginae on the evergreen plant Quercus ilex are discussed.

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