Effect of copper fungicide on Colletotrichum gloeosporioides and other microorganisms on avocado leaves and fruit

Stirling , A. M., Pegg, K. G., Hayward, A. C. and Stirling, G. R. (1999) Effect of copper fungicide on Colletotrichum gloeosporioides and other microorganisms on avocado leaves and fruit. Australian Journal of Agricultural Research, 50 8: 1459-1468. doi:10.1071/AR98110


Author Stirling , A. M.
Pegg, K. G.
Hayward, A. C.
Stirling, G. R.
Title Effect of copper fungicide on Colletotrichum gloeosporioides and other microorganisms on avocado leaves and fruit
Journal name Australian Journal of Agricultural Research   Check publisher's open access policy
ISSN 0004-9409
Publication date 1999
Sub-type Article (original research)
DOI 10.1071/AR98110
Volume 50
Issue 8
Start page 1459
End page 1468
Total pages 10
Place of publication Vic, Australia
Publisher CSIRO Publishing
Collection year 1999
Language eng
Subject C1
300303 Plant Protection (Pests, Diseases and Weeds)
620205 Tropical fruit
Abstract An investigation into the effect of copper fungicide on non-target microorganisms on avocado (cvv. Hass and Nabal) showed that populations of filamentous fungi, yeasts, and bacteria on leaves were at least 10-fold less after a single application of copper than on unsprayed leaves. This detrimental effect of copper on microorganisms on the phylloplane was confirmed in random samples collected from 5 commercial avocado orchards with regular pesticide spray programs but where isolated unsprayed trees were also available. An intensive 16-month study was carried out on 2 adjacent orchards, 1 that was sprayed with copper fungicide at monthly intervals from October to April each year, and the other that had not been sprayed for at least 6 years. Populations of filamentous fungi, yeasts, and bacteria on leaves and fruit were 10-100-fold lower in the sprayed orchard than in the unsprayed orchard. However, populations in the sprayed orchard recovered during the winter non-spray periods to levels comparable to the unsprayed orchard. In 1993 and 1994, fruit were harvested from both orchards, ripened, and assessed for anthracnose caused by Colletotrichum gloeosporioides. In both years, there was significantly less disease in unsprayed fruit (mean disease rating 1.13 and 0.32, respectively) than in sprayed fruit (mean disease rating 1.83 and 2.18, respectively). These results show that copper fungicide is detrimental to phylloplane microorganisms and suggest that those organisms are providing some natural suppression of C. gloeosporioides on avocado.
Keyword Agriculture, Multidisciplinary
Disease Suppression
Anthracnose
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Integrative Legume Research Publications
School of Agriculture and Food Sciences
 
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Created: Tue, 10 Jun 2008, 14:23:05 EST