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Predisposition of Melaleuca (Melaleuca quinquenervia) to Invasion by the Potential Biological Control Agent Botryosphaeria ribis

Published online by Cambridge University Press:  12 June 2017

Min B. Rayachhetry ,
George M. Blakeslee  and
Ted D. Center
Min B. Rayachhetry
Affiliation:
Fort Lauderdale Research and Education Center, University of Florida, Fort Lauderdale, FL 33314
George M. Blakeslee
Affiliation:
School of Forest Resources and Conservation, University of Florida, Gainesville, FL 32611
Ted D. Center
Affiliation:
Aquatic Weed Research Laboratory, USDA-ARS, Fort Lauderdale, FL 33314
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Abstract

Enhancement of the canker causing ability of Botryosphaeria ribis on melaleuca was studied with respect to stress from simulated drought, low temperature, and defoliation treatments. Low xylem water potential was related to increased level of canker development and subsequent tree mortality. Canker development was enhanced by low temperature treatments with alternating exposure to 6 C for 3 d followed by 4 d at 30 (±5) C for 8 wk. Partial defoliation did not affect canker development but complete defoliation of B. ribis-inoculated ramets resulted in tree mortality within 4 wk. Callusing of melaleuca wounds was either reduced or prevented in stressed trees. These observations suggest that stress induced on the tree enhances the tree-killing efficacy of this fungus.

Keywords

Melaleuca, Melaleuca quinquenervia (Cav.) Blake ♯ MLAQUDefoliationdroughtlow temperaturestem cankerMLAQU
Type
Weed Management
Information
Weed Science , Volume 44 , Issue 3 , September 1996 , pp. 603 - 608
Copyright
Copyright © 1996 by the Weed Science Society of America 

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