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Direct measurement of host and parasitoid recruitment for assessment of total losses due to parasitism in a continuously breeding species, the cabbage aphid, Brevicoryne brassicae (L.) (Hemiptera: Aphididae)

Published online by Cambridge University Press:  10 July 2009

E. R. Lopez  and
R. G. Van Driesche
E. R. Lopez
Affiliation:
Department of Entomology, University of Massachusetts, Amherst, MA 01003, USA
R. G. Van Driesche
Affiliation:
Department of Entomology, University of Massachusetts, Amherst, MA 01003, USA
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Abstract

In studies in Massachusetts, the population density of Brevicoryne brassicae (L.) was measured over the lifespans of two groups of kale leaves from maturation to senescence, taking into consideration aphid spatial pattern (in colonies or as isolated insects) and aphid size as large (adults), medium-sized (nymphal instars 2–4) or small (first-instar nymphs) individuals. Total aphid densities per leaf in both leaf groups showed similar patterns of initial increase followed by a decrease as leaves aged over the 3–4-week period of leaf survival. Aphid densities reached peak values of 8·14 and 8·64 aphids per leaf for the two leaf groups studied, and 65–67% of all aphids observed occurred in colonies. Host and parasitoid recruitment to the aphid and the parasitoid immature populations were measured using a modification of the technique of Van Driesche & Bellows (1988). Total host recruitments per leaf were 43·7 and 64·6 aphids for the first and second leaf groups. Parasitoid recruitment was 6·8–8·1 for the first leaf group and 8·2–15·8 for the second. Recruitment values indicated 15·6–18.6% parasitism for the aphid cohort on the first leaf group and 12·7–24·4% for that on the second one.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 79 , Issue 1 , March 1989 , pp. 47 - 59
Copyright
Copyright © Cambridge University Press 1989

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References

Bahana, J. & Karuhize, G. (1986). The role of Diaeretiella rapae (M'cintosh) (Hymenoptera: Braconidae) in the population control of the cabbage aphid, Brevicoryne brassicae L. (Hemiptera: Aphididae) in Kenya.—Insect Sci. Applic. 7, 605–609.Google Scholar
Bonnemaison, L. (1970). Action de Diaeretiella rapae sur le dévelopment et la morphologie de Brevicoryne brassicae.—Annls Soc. ent. Fr. (N.S.) 6, 167–191.Google Scholar
Couchman, J. R. & King, P. E. (1977). Morphology of the larval stages of Diaeretiella rapae (M'Inthosh) (Hymenoptera: Aphidiidae).—Int. J. Insect Morphol. & Embryol. 6, 127–136.CrossRefGoogle Scholar
Dodd, G. D. (1976). Key for the identification of the instars of the cabbage aphid (Brevicoryne brassicae (L.)).—Pl. Path. 25, 84–86.Google Scholar
Hafez, M. (1961). Seasonal fluctuations of population density of the cabbage aphid, Brevicoryne brassicae (L.), in the Netherlands, and the role of its parasite, Aphidius (Diaeretiella) rapae(Curtis).—Neth. J. Pl. Path. 67, 445–548.Google Scholar
Klingauf, F. & Sengonca, C. (1970). Koloniebildung von Röhrenblattläusen (Aphididae) unter Feindeinwirkung.—Entomophaga 15, 359–377.Google Scholar
Spencer, H. (1926). Biology of the parasite and hyperparasites of aphids.—Ann. ent. Soc. Am. 19, 119–157.Google Scholar
Van Driesche, R. G. (1983). Meaning of “percent parasitism” in studies of insect parasitoids.—Environ. Entomol. 12, 1611–1622.Google Scholar
Van Driesche, R. G. & Bellows, T. S. (1988). Host and parasitoid recruitment for quantifying losses from parasitism, with reference to Pieris rapae and Cotesia glomerata.—Ecol. Entomol. 13, 215–222.Google Scholar