EXOTIC PEST – CALL THE EXOTIC PLANT PEST HOTLINE IF SUSPECTED planthealthaustralia.com.au Jeffrey W. Lotz, Department of Agriculture and Consumer Services, Bugwood.org Services, and Consumer Agriculture of Florida Department Lotz, W. Jeffrey Timothy Schubert, Florida Department of Agriculture and Consumer Services, Bugwood.org Services, and Consumer Agriculture of Schubert, Florida Department Timothy Florida Department of Agriculture and Consumer Services, Division of Plant Industry Plant Division of Services, and Consumer Agriculture of Florida Department Bugwood.org Archive, Thick and spongy lesions of canker Thick and spongy lesions of citrus canker Citrus canker infected , stems and leaves infected Citrus canker Cankers on citrus fruit surrounded by yellow halo yellow by surrounded on citrus fruit Cankers

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Australia. ), the larvae of a small moth widely distributed in of a small moth ), the larvae citrella feeding activity of the citrus leaf miner (Phyllocnitis feeding yield. Symptoms are exacerbated by injury caused by by exacerbated are yield. Symptoms infection sites and severely impacts fruit quality and sites and severely infection fruit. The disease presents as lesions or cankers at as lesions or cankers fruit. The disease presents pv. and stems, thorns on leaves, and natural openings alfalfae (Xanthomonas halo. Citrus bacterial spot yellow than those of citrus canker and lack the characteristic than those of citrus canker presence of the citrus leaf miner. presence drier of scab are lesions of Australia, however, and severe in tropical and subtropical areas or in the areas and subtropical in tropical and severe areas in coastal ) which occurs scab (Elsinoe fawcettii fruit. can lead to tree death. The disease is more obvious death. The disease is more can lead to tree with the disease lemon be confused could Citrus canker on citrus form flat and rarely the lesions are however, and general tree decline. In severe cases citrus canker cases citrus canker decline. In severe and general tree with? What can it be confused canker; to citrus (Florida), also has similar leaf symptoms drop can also occur, along with defoliation, twig dieback along with defoliation, can also occur, drop fruit, are surrounded by a yellow halo. Premature fruit halo. Premature a yellow by surrounded fruit, are subsp. have a watery or oily appearance, and on leaves and leaves and on or oily appearance, a watery have diameter and become thick and spongy. Lesion margins Lesion thick and spongy. and become diameter time to a maximum size of approximately 2-10 mm in of approximately time to a maximum size and transition to brown or grey. Lesions expand over over expand Lesions or grey. and transition to brown are initially tiny pin-point blemishes that are tan in colour blemishes that are pin-point initially tiny are such as the leaves, stems, thorns and fruit. The lesions stems, such as the leaves, formation of lesions on above-ground parts of citrus of lesions on above-ground formation The characteristic symptom of citrus canker is the of citrus canker The characteristic symptom What should I look for? X. axonopodis pv. as X. axonopodis known (also subsp. citri the bacterium Xanthomonas caused by Citrus canker is a serious disease of citrus and is is a serious disease of citrus and Citrus canker What is citrus canker? What is citrus Citrus canker Citrus

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ant l AUSTRALIA P planthealthaustralia.com.au and in the USA (Florida). and in the USA citrus from orchard my can I protect How canker? suppliers from material is purchased propagation Ensure Auscitrus. Check your from their budwood that source pests and of new the presence for frequently orchard Make unusual symptoms. for sick plants any investigate you citrus pests so with common familiar are you sure of records Keep different. see something can tell if you staff and visitors that all ensure unusual and anything practices. biosecurity and hygiene to orchard adhere How does it spread? How short distances, rapidly over can be spread Citrus canker climates, through and subtropical particularly in tropical by rain or even wind-blown splash caused by water spread distance Long irrigation systems. overhead human or through flooding, cyclones, through occurs material or plant of infected assisted movement leaf by is exacerbated While citrus canker equipment. of the disease. a vector miners, the leaf miner is not is it now? Where Asia and South throughout is present Citrus canker and IndianAmerica, on some islands in the Pacific of the as some parts as well Oceans, Florida Department of Agriculture and Consumer Services, Division of Plant Industry Plant Division of Services, and Consumer Agriculture of Florida Department Bugwood.org Archive, M. Goto, Bugwood.org M. Goto, Citrus canker lesions on a leaf Citrus canker Tree stem infected by citrus canker by stem infected Tree The material in this publication is for general information only and no person should act, or fail to act on the basis of this material general information The material in this publication is for DISCLAIMER: respect to anything done in reliance on this publication. in reliance done to anything respect without first obtaining professional advice. Plant Health Australia and all persons acting for Plant Health Australia expressly disclaim liability with disclaim liability Australia expressly Health Plant Australia and all persons acting for Health Plant advice. professional without first obtaining