Effect of chemical treatment on Delia radicum and its parasitoids Aleochara bilineata and Trybliographa rapae

2020 ◽  
pp. 75-81
Author(s):  
B. Bromand
Keyword(s):  
Chemical Treatment ◽  
Delia Radicum ◽  
Aleochara Bilineata ◽  
Trybliographa Rapae

Parasitism of overwintering pupae of cabbage root fly, Delia radicum (L.) (Diptera: Anthomyiidae), in England and Wales

1984 ◽  
Vol 74 (1) ◽  
pp. 79-86 ◽  
Author(s):  
S. Finch ◽  
Rosemary H. Collier
Keyword(s):  
Population Dynamics ◽  
Delia Radicum ◽  
Aleochara Bilineata ◽  
England And Wales ◽  
Trybliographa Rapae ◽  
Cabbage Root Fly

AbstractIn populations of overwintering pupae of Delia radicum (L.) collected from ten sites in England and Wales, parasitism varied from 0% at Newcastle to 42% at Evesham. Unlike their hosts, few of the parasites were in extended diapause. Irrespective of when collected at Wellesbourne, emergence of 50% of the ichneumonid parasite Phygadeuon trichops Thoms., the eucoilid parasite Trybliographa rapae (Westw.) and the staphylinid parasite Aleochara bilineata Gylh. occurred after 14, 21 and 28 days, respectively, at 20°C. Early-emerging populations of D. radicum were more heavily parasitised than intermediate- or late-emerging populations. During the winters of 1979–80, 1980–81 and 1981–82, T. rapae and A. bilineata emerged in similar numbers from 37% of the field-collected pupae from Wellesbourne. Less than 1% of the pupae were parasitised by P. trichops. D. radicum adults emerged from a further 25% of the pupae, and the remainder, approximately 38%, were dead. Most dead pupae were recovered from heavily parasitised populations. When parasites were present in high numbers, many of their progeny probably died from multiple parasitism and superparasitism. Comparison with earlier studies indicated that parasitism should be expressed as a percentage of the total pupae, and not just as a percentage of the living insects, if the data are subsequently to be of use for studies on the population dynamics of this pest.

PARASITISM OF OVERWINTERING PUPARIA OF THE CABBAGE MAGGOT, DELIA RADICUM (L.) (DIPTERA: ANTHOMYIIDAE), IN RELATION TO HOST DENSITY AND WEATHER FACTORS

1995 ◽  
Vol 127 (4) ◽  
pp. 535-542 ◽  
Author(s):  
W.J. Turnock ◽  
G. Boivin ◽  
J.W. Whistlecraft
Keyword(s):  
Population Density ◽  
Host Density ◽  
Host Population ◽  
Delia Radicum ◽  
Degree Days ◽  
Parasitoid Species ◽  
Weather Factors ◽  
Aleochara Bilineata ◽  
Trybliographa Rapae ◽  
Cabbage Maggot

AbstractPuparia of Delia radicum collected in late autumn at Winnipeg and Portage la Prairie (Manitoba), St-Jean-sur-Richelieu (Quebec), London (Ontario), and St. John’s (Newfoundland) were parasitized mainly by Aleochara bilineata (Gyllenhal) (Coleoptera: Staphylinidae) and Trybliographa rapae (Westwood) (Hymenoptera: Cynipidae). At Winnipeg, St-Jean, and St. John’s parasitism by A. bilineata was high (<94%) and by T. rapae was low (<3%). At London, both parasitoids attacked less than 14% of the host puparia. At Winnipeg, host population density was related to parasitism by A. bilineata and to the temperature and rainfall during June and July. Parasitism by A. bilineata may be related to cumulative degree-days over 5°C during June and July at Winnipeg and during June and September at London. In Canada, the parasitoid complex is not effectively stabilizing host population density. The introduction of additional parasitoid species should be considered.

scholarly journals Spring emergence of Canadian Delia radicum and synchronization with its natural enemy, Aleochara bilineata

2010 ◽  
Vol 142 (3) ◽  
pp. 234-249 ◽  
Author(s):  
L.D. Andreassen ◽  
U. Kuhlmann ◽  
J.W. Whistlecraft ◽  
J.J. Soroka ◽  
P.G. Mason ◽  
...  
Keyword(s):  
Adult Emergence ◽  
Development Rate ◽  
Delia Radicum ◽  
Aleochara Bilineata ◽  
Development Rates ◽  
Models Of Development ◽  
Soil Temperatures ◽  
Truncated Normal ◽  
Diapause Development ◽  
Spring Emergence

AbstractTo characterize time of spring emergence following post-diapause development, Delia radicum (L.) (Diptera: Anthomyiidae) from Saskatchewan, Manitoba, and southwestern Ontario were collected in fall, maintained over winter at 1 °C, then transferred to higher constant temperatures until adult emergence. At each location there were “early” and “late” phenotypes. Truncated normal models of temperature dependency of development rate were fitted for each phenotype from each location. We provide the first evidence of geographic variation in the criteria separating these phenotypes. Separation criteria and models for early and late phenotypes at the two prairie locations, approximately 700 km apart, were indistinguishable, but differed from those for Ontario. Prairie phenotypes developed more slowly than Ontario phenotypes, and more prairie individuals were of the late phenotype. Poor synchronization of spring emergence could impair predation of D. radicum eggs by adult Aleochara bilineata Gyllenhal (Coleoptera: Staphylinidae). Aleochara bilineata from Manitoba were reared and development rates modelled as for D. radicum. Models of development rates for the two species, when combined with simulated soil temperatures for two prairie locations, suggest that emergence of adult A. bilineata is well synchronized with availability of D. radicum eggs in prairie canola.

scholarly journals Erroneous records of Aleochara bipustulata from North America: an assessment of the evidence

2005 ◽  
Vol 137 (2) ◽  
pp. 182-187 ◽  
Author(s):  
K.S. Hemachandra ◽  
N.J. Holliday ◽  
J. Klimaszewski ◽  
P.G. Mason ◽  
U. Kuhlmann
Keyword(s):  
North America ◽  
Classical Biological Control ◽  
Delia Radicum ◽  
Museum Specimens ◽  
Canadian Prairie ◽  
Aleochara Bilineata ◽  
Palearctic Species ◽  
Cabbage Root Maggot ◽  
Taxonomic Studies ◽  
Root Maggot

AbstractAleochara bipustulata (L., 1761) (Coleoptera: Staphylinidae) is a Palearctic species and a natural enemy of the cabbage root maggot, Delia radicum (L., 1758) (Diptera: Anthomyiidae). It has been identified as a candidate for introduction to Canada for classical biological control of D. radicum. Recent taxonomic studies assert that A. bipustulata is absent from the Nearctic; however, there are numerous publications reporting the presence of the species in North America. We examined voucher material relating to these publications and additional museum specimens labeled as A. bipustulata. In addition, we reared Aleochara spp. from D. radicum puparia collected in the Canadian prairie provinces. Specimens that, based on external anatomy, could be A. bipustulata were definitively identified using characters of the genitalia. All of the 141 museum specimens labeled A. bipustulata were found to be Aleochara verna Say, 1836. A total of 811 individuals of Aleochara spp. were reared from D. radicum puparia; of these, 690 were Aleochara bilineata Gyllenhal, 1810, 121 were A. verna, and none were A. bipustulata. We have found no evidence that A. bipustulata occurs in North America.

Host-stage selection by Trybliographa rapae, a parasitoid of the cabbage root fly Delia radicum

2000 ◽  
Vol 96 (3) ◽  
pp. 231-237 ◽  
Author(s):  
Nathalie Neveu ◽  
Liliane Krespi ◽  
Nabila Kacem ◽  
Jean-Pierre Nenon
Keyword(s):  
Delia Radicum ◽  
Trybliographa Rapae ◽  
Cabbage Root Fly ◽  
Host Stage

Phygadeuon trichops Thoms. (Hymenoptera: Ichneumonidae), an Occasional Parasite of Hylemya spp. (Diptera: Anthomyiidae)

1956 ◽  
Vol 88 (2) ◽  
pp. 69-73 ◽  
Author(s):  
A. Elizabeth Monteith
Keyword(s):  
Life Histories ◽  
Aleochara Bilineata ◽  
Trybliographa Rapae ◽  
Hylemya Brassicae ◽  
Preferred Hosts

In extensive surveys for parasites of Hylemya brassicae (Bouché), H. floralis (Fall.), and H. cilicrura (Rond.) on cruciferous crops in Canada and Europe, observations were made on the life-histories and behaviour of the parasites. Accounts of the two most abundant parasites, Aleochara bilineata Gyll. and Trybliographa rapae (Westw.), have already been published, the former by Colhoun (1953) and the latter by Wishart and Monteith (1954). The present paper deals with one of the minor parasites, Phygadeuon trichops Thoms. In the surveys this parasite was found in Norway, Holland, and Scotland but in such small numbers as to indicate that it has other, preferred hosts and that it only occasionally attacks Hylemya spp. Phygadeuon fumator (Grav.) was reared from Hylemya sp. from France and is recorded in the literature from Hylemya spp. in Russia (Meier, 1927; Vodinskaya, 1928) and in England (Wadsworth, 1915). No references were found to P. trichops from Hylemya spp. and no accounts of the biology of either species.

Spatial patterns of Trybliographa rapae parasitism of Delia radicum larvae in oilseed rape and cauliflower

2007 ◽  
Vol 131 (5) ◽  
pp. 338-346 ◽  
Author(s):  
K. S. Hemachandra ◽  
U. Kuhlmann ◽  
P. G. Mason ◽  
N. J. Holliday
Keyword(s):  
Spatial Patterns ◽  
Oilseed Rape ◽  
Delia Radicum ◽  
Trybliographa Rapae
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