Skip to main content Accessibility help


  • D. A. Raworth (a1), B. D. Frazer (a1), N. Gilbert (a2) and W. G. Wellington (a3)

Maris Kestrel kale, Brassica oleracea L., was planted and sampled in two locations during 1977–78. The aphids Brevicoryne brassicae (L.) and Myzus persicae (Sulzer), syrphids in the genera Syrphus and Scaeva, the cecidomyiid Aphidoletes aphidimyza (Rond.), the parasite Diaeretiella rapae (M'Intosh), and the fungus Entomophthora aphidis Hoffman were observed in the samples. A volumetric technique for assessing aphid numbers was developed and evaluated. Peak numbers of B. brassicae differed by an order of magnitude between plots, but the pattern of monotonic increase in the spring, followed by an abrupt decline in the rate of increase, a mid-summer peak, and an autumn population decline was consistent throughout. The first major decline in the rate of increase of B. brassicae was correlated with the appearance of A. aphidimyza and syrphid larvae. Declining adult aphid weight, which suggested declining fecundity, increased alate production at high aphid densities, parasite pressure, and leaf fall added to the damping effect of predators. In autumn, cool temperatures and production of sexuals further reduced the rate of increase of B. brassicae.

De 1977 à 1978, on a planté et échantillonné la variété Maris Kestrel kale de Brassica oleracea L. à deux endroits. On a observé les pucerons Brevicoryne brassicae (L.) et Myzus persicae (Sulzer), des syrphes des genres Syrphus et Scaeva, la cécidomyie Aphidoletes aphidimyza (Rond.), le parasite Diaeretiella rapae (M'Intosh) et le champignon Entomophthora aphidis Hoffman dans les échantillons. On a par ailleurs mis au point et évaluer une technique volumétrique d'évaluation de la population de pucerons. Les pics dans la population de B. brassicae variaient d'un ordre de grandeur entre les parcelles; cependant, on a pu observer un comportement constant caractérisé par une augmentation monotonique au printemps suivie d'une baisse abrupte du taux de croissance puis d'un sommet au milieu de l'été et enfin, d'une seconde chute de population à l'automne. La première baisse principale du taux de croissance du nombre de B. brassicae correspondait à l'apparition de A. aphidimyza et des larves de syrphes. Par ailleurs, une perte de poids chez les adultes (laissant supposer une baisse de la fécondité), une forte production d'individus ailés (à haute densité) la pression exercée par le parasite et la chute des feuilles on accentué les effets des attaques des prédateurs. En automne, les températures fraîches et la production d'individus sexués ont entraîné une nouvelle baisse du taux de croissance de la population de B. brassicae.

Hide All
Andrews, F. G. 1978. Taxonomy and host specificity of nearctic Alloxystinae with a catalog of the world species (Hymenoptera: Cynipidae). Occas. Pap. Ent. 25. Calif. Dep. Food Agric. Lab Serv. 128 pp.
Barlow, N. D. and G. Dixon, A. F.. 1980. Simulation of Lime Aphid Population Dynamics. Center for Agricultural Publishing and Documentation, Wageningen, Netherlands. 164 pp.
Dixon, A. F. G. and Wratten, S. D.. 1971. Laboratory studies on aggregation, size and fecundity in the black bean aphid, Aphis fabae Scop. Bull. ent. Res. 61: 97111.
Dodd, G. D. 1976. Key for the identification of the instars of the cabbage aphid (Brevicoryne brassicae (L.)). Plant Pathol. 25: 8486.
Frazer, B. D. and Gilbert, N.. 1976. Coccinellids and aphids: a quantitative study of the impact of adult ladybirds (Coleoptera: Coccinellidae) preying on field populations of pea aphids (Homoptera: Aphididae). J. ent. Soc. Br. Columb. 73: 3356.
Gilbert, N. 1980. Comparative dynamics of a single-host aphid. I. The evidence. J. Anim. Ecol. 49: 351369.
Gilbert, N. and Gutierrez, A. P.. 1973. A plant-aphid-parasite relationship. J. Anim. Ecol. 42: 323340.
Gilbert, N., Gutierrez, A. P., Frazer, B. D., and Jones, R. E.. 1976. Ecological Relationships. W.H. Freeman, Reading. 157 pp.
Gutierrez, A. P., Havenstein, D. E., Nix, H. A., and Moore, P. A.. 1974. The ecology of Aphis craccivora Koch and subterranean clover stunt virus in south-east Australia. II. A model of cowpea aphid populations in temperate pastures. J. Appl. Ecol. 11: 120.
Hafez, M. 1961. Seasonal fluctuations of the population density of the cabbage aphid, Brevicoryne brassicae (L.) in the Netherlands, and the role of its parasite Aphidius (Diaeretiella) rapae (Curtis). Tijdschr. PlZiekt. 67: 445548.
Hatley, E. and Fulkerson, R. S.. 1975. Annuals for supplementary feed. Ont. Min. Agric. Food. Publ. 47. 12 pp.
Hughes, R. D. 1963. Population dynamics of the cabbage aphid, Brevicoryne brassicae (L.). J. Anim. Ecol. 32: 393424.
Hughes, R. D. and Gilbert, N.. 1968. A model of an aphid population — a general statement. J. Anim. Ecol. 37: 553563.
Jensen, D. R., Beus, G. B., and Storm, G.. 1968. Simultaneous statistical tests on categorical data. J. exp. Educ. 36: 4656.
Luttmerding, H. A. 1981. Soils of the Langley–Vancouver map area. Rep. 15. Prov. of B.C. Ministry Environ. Assessm. Plan. Div. 227 pp.
Maelzer, D. A. 1977. The biology and main causes of changes in numbers of the rose aphid, Macrosiphum rosae (L.) on cultivated roses in South Australia. Aust. J. Zool. 25: 269284.
Province of British Columbia Department of Agriculture. 19671977. Climate of British Columbia. Tables of temperature, precipitation and sunshine. 652 pp.
Province of British Columbia Ministry of Agriculture. 1977. Vegetable Production Guide. 140 pp.
van Emden, H. F. and Bashford, M. A.. 1971. The performance of Brevicoryne brassicae and Myzus persicae in relation to plant age and leaf amino acids. Entomologia exp. appl. 14: 349360.
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

The Canadian Entomologist
  • ISSN: 0008-347X
  • EISSN: 1918-3240
  • URL: /core/journals/canadian-entomologist
Please enter your name
Please enter a valid email address
Who would you like to send this to? *


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed