Emergence Under Natural and Manipulated Conditions of
Tetrastichus julis
,
1
an Introduced Larval Parasite of the Cereal Leaf Beetle,
2
with Reference to Regional Population Management
3

Gage, Stuart H.; Haynes, D. L.

doi:10.1093/ee/4.3.425

Cited by 56 publications

(37 citation statements)

References 0 publications

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“…The lower threshold temperature we obtained for T. julis from Tompkins CO., N.Y., is very similar to that derived by Gage and Haynes (1975) for a population from Michigan (Fig. 1).…”

Section: Postdiapause Period Of Dormancysupporting

confidence: 82%

“…We tested the rate of postdiapause development at temperatures within the range that produced the straight-line portion of the temperature-development curve obtained by Gage and Haynes (1975). Subsequently, we calculated a regression curve for T. julis's postdiapause development using the least squares method.…”

Section: Methodsmentioning

confidence: 99%

“…This difference may be due to differences in our experimental procedures. For example, we used parasites that had terminated diapause in the field and transferred them to temperature-controlled incubators, whereas Gage and Haynes (1975) used field-collected parasites that had been held in the laboratory for 14 weeks at low temperatures and an unspecified photoperiod before transfer to temperature-regulated water baths. It is unlikely that thermal accumulations would have occurred in the New York population before our sample date because the soil temperatures remained well below the t value.…”

Section: Postdiapause Period Of Dormancymentioning

confidence: 99%

“…This gregarious eulophid attacks all four of its host's larval stages, and overwinters as free-living larvae inside the host pupal cell. The overwintering population consists of both first and second generation larvae (Gage and Haynes 1975).…”

Section: Introductionmentioning

confidence: 99%

“…Although important aspects of T. julis's biology and ecology have been studied (Gage and Haynes 1975;Haynes et al 1974;Barr et al 1973;Dysart et al 1973), much is unknown about its overwintering biology (see Dysart et al 1973). Therefore, our objectives were to determine the factors that maintain T. julis's diapause, to establish when the parasite's diapause ends in the field, and to determine the thermal requirements for T. julis's postdiapause development.…”

Section: Introductionmentioning

confidence: 99%

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ENVIRONMENTAL CONTROL OF DIAPAUSE AND POSTDIAPAUSE DEVELOPMENT INTETRASTICHUS JULIS(HYMENOPTERA: EULOPHIDAE), A PARASITE OF THE CEREAL LEAF BEETLE,OULEMA MELANOPUS(COLEOPTERA: CHRYSOMELIDAE)

1980

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Can. Ent. 112: 1277Ent. 112: -1284Ent. 112: (1980 Mature Tetrastichus julis (Walker) larvae, which overwinter in the pupal cells of their dead cereal leaf beetle hosts, enter diapause in late summer. Diapause is maintained by warm conditions and short daylengths during late fall and early winter; it ends without a specific terminating stimulus. Subsequently the larvae remain in a state of postdiapause quiescence until soil temperatures rise above 9"C, the theoretical threshold (t) for postdiapause development. Emergence of the central New York population occurs when the parasites have accumulated 162 degree days (Do) of heat above 9°C. This K value is considerably lower than that previously reported for a population from Michigan.Our study provides the first experimental evidence that both temperature and photoperiod regulate the rate of diapause development in a parasitic insect. ResumeLes larves matures de Tetrastichus julis (Walker) entrent en diapause a la fin de 1'8ti et hivernent dans la cellule nymphale de leur h6te, le criockre des c6r&ales, aprks la mort de celui-ci. La diapause est maintenue par les conditions douces et les courtes photopinodes qui prevalent a la fin de I'automne et au debut de I'hiver; la terminaison de la diapause ne depend d'aucun stimulus sp6cifique. Par la suite les larves demeurent dans un Ctat de quiescent de postdiapause jusqu'a ce que la temp6rature du sol s'tleve au-dessus de 9°C seuil thdorique (t) du d6veloppement posterieur la diapause. Pour les populations du centre de I'btat de New York, I'bmergence se produit lorsque les parasites ont accumuli l'huivalent thermique de 162 degks-jours (Do) au-dessus de 9°C. Cette valeur de k est nettement inferieure a celle rapportee anteneurement pour une population du Micnlgan.Par cette etude, nous sommes les premiers demontrer expkrimentalement que la temperature et la photop6riode sont tous deux impliques dans la regulation de la vitesse du developpement chez un insecte parasitique en diapause.

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“…The lower threshold temperature we obtained for T. julis from Tompkins CO., N.Y., is very similar to that derived by Gage and Haynes (1975) for a population from Michigan (Fig. 1).…”

Section: Postdiapause Period Of Dormancysupporting

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Postdiapause Period Of Dormancymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%