mid-season crash in aphid populations: why and how does it occur?

• Published in: Ecological entomology Vol. 29; no. 4; pp. 383 - 388
• Main Authors: Karley, A.J, Parker, W.E, Pitchford, J.W, Douglas, A.E
• Format: Journal Article
• Language: English
• Published: Oxford, UK; Malden, USA Blackwell Science Ltd 01.08.2004; Blackwell Science
• Subjects: Animal and plant ecology; Animal, plant and microbial ecology; Animals; Aphid; aphid emigration; Aphididae; Aphidoidea; Biological and medical sciences; birth rate; Demecology; emigration; environmental factors; fecundity; food plants; Fundamental and applied biological sciences. Psychology; insect pests; literature reviews; mathematical models; mid-season population crash; migration behavior; migratory behavior; mortality; natural enemies; nutritive value; plant quality; population crash; population density; population dynamics; Protozoa. Invertebrata; weather; Aphidoidea; Pest; Homoptera; Seasonal variation; Arthropoda; Insecta; Aphididae; Population dynamics; Invertebrata; Mathematical model; Animal population; Population decline

1. Aphid populations on agricultural crops in temperature regionscollapse over a few days from peak numbers to local extinction soon after midsummer (e.g. mid-July in the U.K.). The populations recover 6-8 weeks later. There is anecdotal or incidental evidence of an equivalent mid-season population...