Host Instar Preference of the Aphid Parasite Praon pequodorum (Hymenoptera: Aphidiidae)

AbstractThe cecidomyiid Endaphis sp. is a locally common endoparasite of the aphid Euceraphis gillettei on alder in coastal British Columbia. The midge represents the first known protelean parasite of aphids that may develop gregariously inside the host. Field and laboratory observations are presented on the parasite’s life history and host instar preference. Mechanisms enabling the partitioning of the available “host space” between Endaphis sp. and the aphidiid parasite Praon sp. are discussed.

Download Full-text

The effect of host instar on the size and sex ratio of the endoparasitoid Dacnusa sibirica

Entomologia Experimentalis et Applicata ◽

10.1111/j.1570-7458.1995.tb01883.x ◽

1995 ◽

Vol 74 (2) ◽

pp. 121-124 ◽

Cited By ~ 21

Author(s):

P. Croft ◽

M. J. W. Copland

Keyword(s):

Sex Ratio ◽

Host Instar

Download Full-text

THE LARVAL INSTARS OF APHIDIUS SMITHI (HYMENOPTERA: APHIDIIDAE)

The Canadian Entomologist ◽

10.4039/ent111631-5 ◽

1979 ◽

Vol 111 (5) ◽

pp. 631-634 ◽

Cited By ~ 12

Author(s):

R. J. Chorney ◽

M. Mackauer

Keyword(s):

Electron Micrographs ◽

Ventral Side ◽

Pea Aphid ◽

Scanning Electron Micrographs ◽

Diagnostic Features ◽

Larval Instars ◽

The Third ◽

Aphid Parasite ◽

Feeding Structure ◽

Scanning Electron

AbstractThe pea aphid parasite Aphidius smithi Sharma & Subba Rao has four larval instars. The first and the fourth instars are mandibulate. The second instar possesses oral lobes but not mandibles. A bilobed feeding structure on the ventral side of the head of the third instar could function as a pharyngeal pump. The chief diagnostic features of each instar are illustrated with scanning electron micrographs. Variability in the number of larval instars among species of Aphidiidae is discussed.

Download Full-text

AN UPPER BOUNDARY FOR THE SEX RATIO IN A HAPLODIPLOID INSECT

The Canadian Entomologist ◽

10.4039/ent1081399-12 ◽

1976 ◽

Vol 108 (12) ◽

pp. 1399-1402 ◽

Cited By ~ 13

Author(s):

M. Mackauer

Keyword(s):

Sex Ratio ◽

Aphid Parasite ◽

The Mean ◽

Favourable Environment ◽

Number Of Males ◽

Limiting Value ◽

Upper Boundary

AbstractMated females of the aphid parasite Aphidius smithi produced only unfertilized eggs (i.e. sons) for the first 2–3 h after copulation and a variable proportion of fertilized eggs (i.e. daughters) thereafter. As a result, the mean proportion of daughters among the offspring of single females was always less than unity, even in a highly favourable environment; the limiting value of the sex ratio was estimated at approximately 85% females. An argument is presented that in haplodiploid species with a variable and environmentally controlled sex ratio a male-producing mechanism is required to ensure the production of a sufficient number of males for the fertilization of all females.

Download Full-text

Host Instar as a Determinant of Preference and Suitability for Two Parasitoids Attacking Late Instars of the Spruce Budworm (Lepidoptera: Tortricidae)

Annals of the Entomological Society of America ◽

10.1093/aesa/83.4.734 ◽

1990 ◽

Vol 83 (4) ◽

pp. 734-741 ◽

Cited By ~ 23

Author(s):

Christian Hébert ◽

Conrad Cloutier

Keyword(s):

Spruce Budworm ◽

Host Instar

Download Full-text

A NEW SPECIES OF PRAON (HYMENOPTERA: APHIDIIDAE), PARASITIC ON THE DUSKY-VEINED WALNUT APHID, CALLAPHIS JUGLANDIS (HOMOPTERA: APHIDIDAE)

The Canadian Entomologist ◽

10.4039/ent1141159-12 ◽

1982 ◽

Vol 114 (12) ◽

pp. 1159-1161 ◽

Cited By ~ 1

Author(s):

M. Mackauer ◽

D. J. Sullivan

Keyword(s):

Biological Control ◽

New Species ◽

Juglans Regia ◽

Aphid Parasite ◽

A New Species

AbstractThe aphid parasite Praon callaphis, new species, from Afghanistan is described and illustrated. The species was introduced into California for the biological control of Callaphis juglandis (Goeze) on Juglans regia L.

Download Full-text