Journal article

Photosynthetic responses of field-grown Pinus radiata trees to artificial and aphid-induced defoliation

Alieta Eyles, David Smith, Elizabeth A Pinkard, Ian Smith, Ross Corkrey, Stephen Elms, Chris Beadle, Caroline Mohammed

TREE PHYSIOLOGY | OXFORD UNIV PRESS | Published : 2011

Abstract

The phloem-feeding aphid Essigella californica represents a potential threat to the productivity of Pinus radiata plantations in south-eastern Australia. Five- and nine-year-old field trials were used to characterize the effects of artificial and natural aphid-induced (E. californica) defoliation, respectively, on shoot photosynthesis and growth. Photosynthetic capacity (A(max)) was significantly greater following a 25% (D25) (13.8 µmol m(-2) s(-1)) and a 50% (D50) (15.9 µmol m(-2) s(-1)) single-event upper-crown artificial defoliation, 3 weeks after defoliation than in undefoliated control trees (12.9 µmol m(-2) s(-1)). This response was consistently observed for up to 11 weeks after the de..

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University of Melbourne Researchers