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Grapevine Trunk Diseases Symptoms and Distribution

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Grapevine Trunk Diseases Symptoms and Distribution Grapevine Trunk Diseases symptoms and distribution Background Grapevine trunk diseases are caused by fungal pathogens that grow primarily in mature wood. These can infect either: 1. propagation material and affect growth of newly planted vines; or 2. established vines through wounds (primarily pruning wounds) causing a loss of productivity, often as grapevines reach elite stage of maturity. Grapevine trunk diseases affect vineyard productivity through: ■ increased production cost; ■ yield loss and reduced quality; Figure 1 Botryosphaeria dieback causes dead arm or dieback of the cordons and and trunk. ■ decreased vineyard longevity. Photograph: Wayne Pitt The most prevalent grapevine trunk Symptoms diseases in Australia are: The two diseases are often mistaken 1. botryosphaeria dieback for each other because some of the (formerly known as bot canker); symptoms are identical (Table 1). Fungi and enter the vine via pruning wounds or 2. eutypa dieback. other exposed areas causing dieback Botryosphaeria dieback is caused of the grapevine often described as by a number of species within the dead arm (Figure 1). Damage to the Botryosphaeriaceae family. These vascular system results in the loss of fungi infect a wide range of hosts spur positions along the cordon and but are most commonly associated may progress to the trunk (Figure 2). with diseases of woody plants such Wedge-shaped cankers in the trunks as acacia and eucalyptus. Several and cordons of declining grapevines Botryosphaeriaceae species are visible upon cross sectioning are found in most grape growing regions characteristic of both diseases of Australia. (Figure 3). Eutypa dieback is caused by the Other symptoms may include: fungus Eutypa lata. E. lata was first ■ stunted shoots; described on apricot, and has since ■ delayed bud burst; become an important pathogen of grapevines in Australia. ■ bleached canes; ■ bud necrosis; and ■ bunch rots. Eutypa dieback is distinguished Figure 2 Botryosphaeria dieback in from botryosphaeria dieback by the the grapevine trunk. presence of foliar symptoms, but Photograph: Wayne Pitt these are not always present. The foliar symptoms are caused by toxins produced by the fungus, resulting in: org nwgic. w ww. ■ stunted, yellowing shoots; ■ shortened internodes; and ■ small cupped leaves with necrotic margins, most obvious in spring (Figures 4 and 5). Additionally, grape bunches may not initiate, and may drop off after flowering or shrivel. Smaller bunch size and uneven berry ripening may also occur (Figure 6). Fungal fruiting bodies on dead wood infected with eutypa dieback have a charcoal appearance (Figure 7). Figure 3 Wedge-shaped canker seen in the cross section of the grapevine trunk typical of botryosphaeria dieback and eutypa dieback. Figure 4 Distorted shoots caused by the eutypa dieback fungus, Eutypa lata. Photograph: Sandra Savocchia Photograph: Sandra Savocchia Table 1 Symptoms of the grapevine trunk diseases botryosphaeria dieback and eutypa dieback. Not all symptoms occur together. Symptom Botryosphaeria dieback Eutypa dieback Wedge-shaped canker when cut in cross section 3 3 External cankers 3 3 Damage to vascular system 3 3 Dead arm 3 3 Loss of spur positions on cordon 3 3 Stunted shoots 3 3 Delayed bud-burst 3 Bleached canes 3 Bud necrosis 3 Dwarfing of shoots and internodes 3 Yellowing shoots and leaves 3 Leaf cupping with necrotic margins 3 Flowers may not initiate or drop off post flowering 3 Grape berries shrivel 3 Grape bunch size reduced 3 Bunch rot 3 Uneven ripening 3 National Wine and Grape Industry Centre ~ page 2 Distribution Symptoms not sufficient to accurately identify which grapevine trunk disease is present Eutypa lata and species of Botryosphaeriaceae have been Grapevine decline symptoms characteristic of trunk diseases were first the recent focus of research in reported in the Hunter Valley and Mudgee wine regions in NSW, where South Australia and New South they were initially attributed to Eutypa lata infection. No foliage symptoms Wales. A total of nine species of were ever observed, and further investigation revealed the causal Botryosphaeriaceae have been organisms to be members of the Botryosphaeriaceae. collectively found throughout winegrowing regions of SA and NSW. Spread in the land on fresh pruning wounds, or In SA research revealed up to 100% invade reworking or other wounds. of grapevines, in some vineyards, to vineyard be affected by eutypa dieback. E. lata Toxins are thought to be produced by appears to be more widespread in the fungus in the wood and these are Botryosphaeria dieback NSW than first expected and has translocated to the foliage, producing Fungi over-winter as small dark been isolated, along with other the unique foliar symptoms of Eutypa ‘pimple-like’ structures (pycnidia) diatrypaceae fungi, from the Central dieback. Cankers form around initial on diseased wood. These structures Ranges, southern NSW and Big Rivers infection points and damage vascular release spores throughout the districts. While E. lata tends to favour tissue, causing wood necrosis and growing season and following cool climates with a high annual dieback. hydration are spread by wind and rain rainfall, most Botryosphaeriaceae splash. Infection occurs when spores fungi are more suited to warmer land on fresh pruning wounds, or conditions. invade reworking or other wounds. Cankers form around initial infection Accurate identification of the causal points and damage vascular tissue, agents of trunk disease is important causing wood necrosis and dieback. in order to determine management recommendations to reduce the Eutypa dieback impact of grapevine trunk diseases in the vineyard. The fungus survives on dead wood in fruiting bodies (perithecia) It is also important to determine if which have a darkened, charcoal trunk disease pathogens are present appearance (Figure 7). These in a vineyard because infected structures release spores throughout vines can be asymptomatic. Visible the pruning season and following symptoms of trunk disease, can take hydration are spread by wind and rain three to eight years to develop. splash. Infection occurs when spores Management Botryosphaeria dieback and eutypa dieback can only be managed by Figure 6 Grape bunches that form removing infected wood. on grapevines infected Where cordons are affected, remove with eutypa dieback are dead wood as well as 10 cm of often small (right) and healthy tissue and retrain new canes berries ripen unevenly to regain vigour and productivity (left). (Figure 8). Photograph: Mark Sosnowski, SARDI Where the disease has progressed into the crown or further into the trunk, extensive reworking may be required. Remove dead wood as well as 10 cm of healthy tissue and train up water shoots to replace missing grapevines thereby regaining vigour and productivity (Figure 9). Figure 5 Small cupped leaves It is important to remove all infected with necrotic margins plant material from the vineyard to are symptoms of eutypa Figure 7 Fruiting bodies on dead, reduce the risk of re-occurrence. dieback, not seen in diseased wood with botryosphaeria dieback. charcoal appearance. Photograph: Mark Sosnowski, SARDI Photograph: Mark Sosnowski, SARDI National Wine and Grape Industry Centre ~ page 3 Prevention Avoid pruning during and following wet weather as spores are released after rain for up to: ■ 2 hours for Botryosphaeriaceae; species and ■ 36 hours for E. lata. Prune early in winter when spore production is low or late in the season when wounds are less susceptible and heal more rapidly with the onset of higher temperatures. Apply a paint and/or fungicide (Table 2) to all large cuts. Figure 8 Infected wood has been removed from these grapevines, large cuts painted with protective wound treatment and new shoots trained as replacement cordons. Photograph: Cathy Gairn Figure 9 Infected wood has been removed from diseased grapevines and shoots trained to replace trunk and cordons. Photograph: Sandra Savocchia Table 2 Fungicides tested as pruning wound treatments to protect grapevines against trunk diseases. Product Active ingredient Use Greenseal™ tebuconazole Registered for preventative control of Vinevax™ Trichoderma harzianum (biological control Eutypa lata when applied to pruning agent) wounds. Garrison® cyproconazole + iodocarb Provided more than 50% disease control Shirlan® fluazinam of botryosphaeria dieback and eutypa dieback in recent field trials. Folicur® tebuconazole National Wine and Grape Industry Centre ~ page 4 Grapevine Trunk Disease survey undertaken by the National Wine and Grape Industry Centre Distribution of trunk disease pathogens associated with grapevine decline in Project Australia Where Wagga Wagga, NSW When 2007–2011 Collaborators Wayne Pitt, Yu Qiu, Nicola Wunderlich, Chris Steel and Sandra Savocchia, NWGIC, Mark Sosnowski, SARDI and Florent Trouillas, University of California, Davis USA. Funding Grape and Wine Research and Development Corporation-funded Wine Growing Futures program of the National Wine and Grape Industry Centre Background during different reproductive wood samples were collected by To clarify the occurrence and stages; and drilling into cordons and trunks distribution of trunk disease 3. Establish whether E. lata occurs in of symptomatic grapevines pathogens for some of the major NSW vineyards. (Figures 10 to 12). grapevine regions in Australia, a large 5. Two hundred grapevines from survey was conducted. It included Methods two vineyards in the Hunter Valley 4. Ninety-one vineyards across NSW some of the main grapevine
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