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04/12/19 Grapevine Trunk Diseases: wood damage caused by fungi causing disfunctions to vine physiology Laura Mugnai 1999 Italy [email protected] 2001 Portugal 2003 New Zealand Il complesso del mal dell’esca: nuovi 2004 South Africa 2006 California GRAPEVINE TRUNK DISEASES: Insights into vineyard cultural 2008 Italy sviluppi nelle strategie di difesa 2010 Chile practices, alternative wound protection strategies, and radical 2012 Spain interventions to combat Esca and Grapevine Trunk Diseases 2014 Adelaide 2017 Reims 2019 Canada 2022 Repubblica Ceca ISPP Subject matter committee on GTDs: International Council on Grapevine Trunk 26 different Diseases (ICGTD countries!!! At the end of the ‘80ies …leaf symptoms, wilting, branch and But..wood diseases have vines death… always been there! ì …they became a large problem in the last 30 yrs Mechanical grafting: an initially unavoidable consequence of the phylloxera invasion: “grapevines will ì How they start and how we grow grapevine changed start declining…” ì Many botanists and agronomists immediatly reported that grafting and pruning management were going to give declines Slow or rapid vine decline Sudden vine shut down, canes wilting Loss of production Loss of production quality Eventual death of the plant 1 04/12/19 Eppure ci sono stati degli “avvertimenti”. All’inizio del secolo si GRAPEVINE TRUNK DISEASES …a new problem? Wood diseases have always been there! sono individuati i rischi End 1800 Phylloxera We must now accept this and - A large quantity of propagation material Lucien Daniel: Introduction of grafting on rootstock manage the diseases in the best produced way 1970’s Large new planting boom in Europe … ì « L’innesto ha - Lack of knowledge of its role in fungal Beginning of large scale nursery production momentaneamente salvato i Change in cultural techniques=industrialised viticulture …WITH CONSCIOUSNESS! wood diseases nostri vitigni, pur rischiando di compromettere il futuro. 1980-90’s – Sudden and significant increase of Esca complex - LARGE MOVEMENT of propagation in Europe and world wide of young grapevine decline and material = spread of pathogens failure = Higher fungal inoculum ì Alla lunga, molto probabilmente Re-planting and new planting boom = Lower defence capability causerà l’estinzione dei vecchi Nurseries under pressure (A, B & C grade material) =More infection courts (nursery - Susceptible varieties large spread FROST in 1985 = stress factor - Changes in cultural techniques vitigni. » and field) - Changes in trellising and pruning Early 2000’s - Major GTD outbreaks worldwide + management Made worse by the prohibition and/or phase-out of effective Climate change? chemical controls for some wood disease agents Phase-out of benomyl (Benlate) Re-evaluation of Benzimidazole fungicides (carbendazim & thyophanate-methyl) from Sue et Grapevine ….is a vine, a creeping plant! al., 2009 WOUNDS! ….pruning….shoot suckering….propagation process…. WE START Grapevine is a VINE WOUNDING IN THE - No wound repair (no cambium NURSERY!!!!! reactivation, no reactivation of the meristematic activity of the parenchyma) - Dessication cones at wound level - In winter only formation of gels - Tyloses only when growth is reactivated Sue et al., 2009 2 04/12/19 Grapevine ...is a vine! The problem is always present Grapevine has the largest vessels in The infections can remain latent – like herpes simplex infections! – order to bring sap to the leaves. UNTIL… Large mass of leaves with very little ì - the starting conditions are not the best (latent infections, bad quality wood compared to a tree propagation material, bad rooting, bad grafting, wounds on the rootstock, poor Very prone to cavitation = wounds remain open for months plantating practices…) ì - virulent pathogens are present in the area The size and distribution of the vessels = pruning and desuckering we do something is very important for the efficiency of ì - the pathogens reach the most active part of the vine (cambium and phloem) very much far away from what the vine the sap flow ì - our vineyard management produces too many / too large wounds would do ì - we manage vines in ways that they can not defend themselves well =WE MUST SUPPORT THE VINE BY ì - the climate favours the pathogens PROTECTING IT IN A SPECIAL WAY ì …….??? GRAPEVINE TRUNK DISEASES WOOD CANKERS and VASCULAR DISEASES Young vineyards (up to 3-6 year-old) VASCULAR CANKERS: sectorial necrosis DISEASES: black - Petri disease (Esca complex) YOUNG VINE DECLINE Eutypa, streaking - Black foot Botryosphaeriaceae Phaeomoniella Mature vineyards (> 6 year-old) Diaporthe Phaeoacremonium Cadophora - Eutypa dieback Phaeoacremonium - Botryosphaeria dieback Central necrosis: - White decay or Esca (Esca complex) Phaeoacremonium Cadophora - Grapevine Leaf Stripe disease (Esca complex) - Diaporthe/Phomopsis dieback 3 04/12/19 WOOD DECAY: soft spongy mass, lignin degradation The inoculum sources of the fungal agents on grapevine and many other hosts… Fomitiporia sp., Fomitiporella sp. Apoplexy? Inonotus sp. Stereum sp., Secondary metabolites Inocutis sp.... during degradation process? Defence induced substances? Si degrada la lignina, massa spugnosa, soffice…diventa ESCA per il fuoco Ha dato il nome di ESCA alla presenza di carie nel legno (anche agrumi, kiwi, olivo etc) GRAPEVINE TRUNK DISEASES: Many fungi enter the wood but Decline, dieback, death of spurs or cordons: some are pathogenic!!! Cankers and dieback by BOTRYOSPHAERIACEAE Many fruit trees show increasing presence of damages by fungal wood pathogens: Almond, blueberry, olive, pistacio, avocado, apple, plum, etc…not to mention forest trees. DECLINE! • Death of spurs • Degrading enzymes DAMAGES: • Death of cordons Botryosphaeria CANKER • • Phytotoxins Decline Decline with no specific symptoms dieback Leaf necrosis and alteration WHITE • Degrading enzymes DECAY Death of vines or branches • Degrading enzymes Reduction in fruit production VASCULAR • Phytotoxins Reduction in production quality All able to live in ASYMPTOMATIC INFECTIONS in the wood Only the MOST EXTERNAL RINGS ARE ACTIVE in grapevine 4 04/12/19 Botryo dieback Botryo dieback Eutipiosi Botryo dieback Eutipiosi Complesso esca Eutipiosi Complesso esca Some show typical leaf symptoms: Eutypa and Botryosphaeria dieback in the world Cankers and dieback by EUTYPA and DIATRYPACEAE Eutypa dieback Eutypa dieback “witches broom” shoots Some show typical leaf symptoms: Grapevine Leaf Stripe Great care in epidemiological evaluations!! Disease (GLSD-ESCA complex) QUALITY AND QUANTITY Fluctuation of symptoms: LOSSES The number of infected plants is ESCA, - Yield reduction of 30 to 50% Role of vascular pathogens? different from the annual incidence GLSD - Decrease of wine quality Role of phytotoxins? -lower phenolic level Role of vascular -lower anthocians malfunctioning? -lower sugar content The metabolome of a vine changes one month before - Lower quality as for uneven showing foliar symptoms age in the vineyard -Death of vines Necessary at least 3 yrs surveys -Short lived vineyards 5 04/12/19 GRAPEVINE LEAF STRIPE DISEASE: limited wood colonization Climatic/environmental factors influence the diseases inciting FOLIAR symptoms. Role of stress factors? Role of CLIMATE CHANGE? Eutypa = + symptoms if more rain ESCA-Grapevine Leaf stripe Disease = rain/ in the previous winter fluctuation of symptoms + warmer in spring = less symptoms ESCA COMPLEX: sudden apoplexy of the whole vine ESCA COMPLEX: wilting (linked to summer water stress) 6 04/12/19 ESCA COMPLEX: embolism, vascular disfunction ….and the vascular pathogens and canker agents can contribute to decline in young vineyards: PETRI DISEASE Lecomte et al., 2012 Botryo dieback Botryo dieback Eutipiosi Botryo dieback Eutipiosi Complesso esca Eutipiosi Complesso esca YOUNG VINE DECLINE BLACK FOOT (+bad drainage!) Grapevine Leaf Stripe Disease and Petri disease PETRI DISEASE in the world Uneven growth, decline, dieback Black streaking symptoms, black gums vascular occlusion P P P P P P =Petri disease P P P P P P =Grapevine Leaf Stripe disease P P P P P 7 04/12/19 So….the pathogens have a very relevant role but the conditions Alone or together??? that allow their action are just as important MANY of these pathogens can be present in the same vineyard, ì Infections are unavoidable even in the same wound ….BUT THEY NEED TO BE MINIMIZED!!! ì MULTIPLE and ASYMPTOMATIC INFECTIONS are very common. Depending on which prevails or how they interact we can have the different symptoms: ì Slow decline ì The vineyard cultural practices are not likely to change much ì Necrosis of tissues ….BUT WE CAN IMPROVE THEM, KEEPING IN MIND THAT ì Leaf symptoms WOOD DISEASES ARE ALWAYS READY TO ATTACK So….the pathogens have a very relevant role but the conditions that allow their action are just as important Control???? PREVENTION IS THE KEY WORD! …TO CREATE FAVORABLE CONDITIONS FOR THE VINE AND It is a biological reality UNFAVORABLE FOR THE PATHOGENS IS POSSIBLE!! Approccio inevitabile ….BUT THEY NEEDwe TO haven’t BE MINIMIZED!!! yet Direct action to reduce infection: per le malattie da agenti di cancro e di carie embraced! - 1. inoculum reduction (in the nursery and in the vineyard) - 2. wound protection (in the nursery, in mother plants fields, in the vineyard) The approach to the - 3. wound susceptibility - to choose when to prune (risk assesment models?) vineyard management …and indirect action on the host: needs to change - 3. to create conditions that hinder growth in the wood by the pathogens - 4. to create conditions that help