Outdoor Studies of the Efficacy of Alternaria alternata in Controlling Amaranthus retroflexus

Author： Lawrie J.   Greaves M. P.   Down V. M.   Morales-Aza B.   Lewis J. M.  

Publisher： Taylor & Francis Ltd

ISSN： 1360-0478

Source： Biocontrol Science and Technology, Vol.12, Iss.1, 2002-02, pp. : 83-94

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Abstract

Application of 250 L ha-1 containing 107 Alternaria alternata conidia ml -1 caused 61% reduction in dry weight and a 45% mortality in Amaranthus retroflexus plants growing in a wheat crop. However, only 10-22% of the applied conidia were retained on the leaf. In one experiment, conidia remained viable for 4 days on the leaf surface until conditions were favourable for germination. Competition from the wheat crop, as well as its creation of a moist micro-climate, improved the control of Am. retroflexus by A. alternata. Total control of Am. retroflexus may be difficult to achieve with A. alternata, but suppression to reduce or eliminate its competitive effect on crops is possible.

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