Diseases of brambles
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1 Diseases of brambles Megan Kennelly Kansas State University Great Plains Fruit & Vegetable Conference Jan kennelly@ksu.edu Photo; Gerald Holmes, California Polytechnic State University at San Luis Obispo
2 Today s topics Viruses Cankers/cane blight/twig blight Root rot Fruit rots botrytis Raspberry rust
3 Back to Basics - Brambles Location, location, location Soil Good sunlight, good air circulation, good drainage Avoid wild brambles nearby (source of viruses, etc) Organic matter (2-4%) ph
4 Integrated management- Table modified from Midwest Small Fruit Pest Management Handbook Practice Viruses Vert. wilt Orange Rust Cane blights P. Mildew Fruit rots Good air/water drainage 500 ft from wild Eliminate wild brambles Rotation Cultivar resistance Avoid adjacent plantings Disease free stock
5 Integrated management- Table modified from Midwest Small Fruit Pest Management Handbook Practice Viruses Vert. wilt Orange Rust Cane blights P. Mildew Fruit rots Rogue infected plants Improve drying Dispose of diseased canes Maintain vigor Fungicides Harvest before overripe Good handling/stor age
6 Common themes in management Exclude! Inhibit/Limit! Eradicate! Cathie Heidenreich, Cornell University
7 Virus diseases - brambles Mosaic Leaf curl Raspberry Streak Tomato ringspot Brambles are particularly vulnerable to viruses yields can be reduced 70%
8 Even more viruses Alfalfa mosaic virus (AMV) Arabis mosaic virus (ArMV) Cucumber mosaic virus (CMV) Impatiens necrotic spot virus (INSV) Potyvirus group test (POTY) Prunus necrotic ringspot virus (PNRSV) Raspberry bushy dwarf virus (RBDV) Raspberry ringspot virus (RpRSV) Strawberry latent ringspot virus (SLRSV) Strawberry mild yellow edge virus (SMYEV) Tobacco ringspot virus (TRSV) Tobacco streak virus (TSV) Tomato ringspot virus (ToRSV) Tomato spotted wilt virus (TSWV)
9 Even more viruses Alfalfa mosaic virus (AMV) Arabis mosaic virus (ArMV) Cucumber mosaic virus (CMV) Impatiens necrotic spot virus (INSV) Potyvirus group test (POTY) Prunus necrotic ringspot virus (PNRSV) Raspberry bushy dwarf virus (RBDV) Raspberry ringspot virus (RpRSV) Strawberry latent ringspot virus (SLRSV) Strawberry mild yellow edge virus (SMYEV) Tobacco ringspot virus (TRSV) Tobacco streak virus (TSV) Tomato ringspot virus (ToRSV) Tomato spotted wilt virus (TSWV)
10 Even more viruses - Berry screen Alfalfa mosaic virus (AMV) Arabis mosaic virus (ArMV) Cucumber mosaic virus (CMV) Impatiens necrotic spot virus (INSV) Potyvirus group test (POTY) Prunus necrotic ringspot virus (PNRSV) Raspberry bushy dwarf virus (RBDV) Raspberry ringspot virus (RpRSV) Strawberry latent ringspot virus (SLRSV) Strawberry mild yellow edge virus (SMYEV) Tobacco ringspot virus (TRSV) Tobacco streak virus (TSV) Tomato ringspot virus (ToRSV) Tomato spotted wilt virus (TSWV) First sample - $ Each additional - $31.20
11 Bramble virus - Mosaic Caused by several viruses Rubus yellow net black raspberry necrosis raspberry leaf mottle raspberry leaf spot Black and purple raspberries more severely damaged than red (but red can get, too) Spread by large raspberry aphid 4 distinct viruses (cold vs flu vs West Nile)
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14 Véronique Brault, Maryline Uzest, Baptiste Monsion, Emmanuel Jacquot, Stéphane Blanc Aphids as transport devices for plant viruses Comptes Rendus Biologies, Volume 333, Issues 6 7, 2010,
15 Mosaic - Symptoms Vary by cultivar, time of year, and which viruses (remember there are four) Short plants, low vigor Leaves mottled Leaves puckered Symptoms progressively worse year after year Reduced yield Dry, seedy fruit with less flavor Symptoms can disappear in summer heat, but plant still infected
16 Raspberry mosaic - symptoms
17 Virus diseases - brambles Mosaic Leaf curl Raspberry Streak Tomato ringspot
18 Raspberry leaf curl virus Small, crinkled, curled-down leaves Plant loses vigor year after year Berries small, dry, seedy Spread by small raspberry aphid R. Stace-Smith, Bugwood.org
19 Small raspberry aphid
20 Virus diseases - brambles Mosaic Leaf curl Raspberry Streak Tomato ringspot
21 Raspberry streak virus Caused by tobacco streak virus Affects black raspberry Symptoms purple streaks on lower canes Leaves hooked, twisted Fruit are small, seedy, crumbly Uneven ripening eries700/rpd710/index.html
22 Virus diseases - brambles Mosaic Leaf curl Raspberry Streak Tomato ringspot
23 Tomato ringspot virus Affects many species of plants Red raspberries Plant looks fairly normal, somewhat reduced vigor Small, crumbly berries Spread in soil by dagger nematode files/ppfshtml/ppfs-fr-s-9.pdf
24 Viruses - management Certified virus-free stock Remove infected plants Scout in June and again in Aug/sept Don t just prune out symptomatic canes Manage insects (aphids) May not be effective fast transmission Plant feet from wild brambles Avoid planting black or purple raspberries near red (separate as much as possible, don t put reds upwind aphids spread) Resistant varieties see Midwest Small Fruit Pest Management Handbook Don t put new plantings near old, virus-infected ones Abiotic issues can resemble virus herbicide, cold damage, etc
25 Cane/twig diseases Raspberry anthracnose Cane blight Spur blight Similarities and differences
26 Cane disease - Anthracnose Fungus Elsinoe veneta Results in cane dieback, loss of fruit production Particularly severe on black and purple raspberries Small purple spots, enlarge to become oval and sunken Girdles the cane Fruit may fail/shrivel
27 Anthracnose 2.html Charles Drake, Virginia Polytechnic Institute and State University, Bugwood.org
28 Anthracnose Fungus survives winter in lesions on the canes Spores germinate and spread to new tissue in spring, usually in between where the leaves attach (internodes)
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32 Cane diseases - Spur blight Fungal disease (Didymella applanata) More common on red raspberry than black/purple Damage Blighting of fruit-bearing spurs Kill buds Dry/small seeds More prone to winter injury
33 Dark areas form in late spring/early summer, often where leaf attaches (node) Girdle cane Canes crack/split Spore-producing structures form Summer (pycnidia) Winter (perithecia) Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org
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35 D. Bryoniae spores oozing Gerald Holmes, California Polytechnic State University at San Luis Obispo, Bugwood.org
36 D. bryoniae Gerald Holmes, California Polytechnic State University at San Luis Obispo, bugwood.org
37 Cane diseases - Cane blight Fungal pathogen (Leptosphaeria coniothyrium) Also affects rose, others More common on black raspberry, but also on red and purple. Rare on blackberry Damage Shoot death, low yield Often starts at wounds
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39 Cane blights - Common themes Caused by fungi Spread from last year s canes (floricanes) to new canes (primocanes) in wet weather in late spring/early summer Canker/girdling
40 Management: anthracnose, spur blight, cane blight Avoid winter injury appropriate fertility Careful pruning to break life cycle Scout in late summer easier to see Prune out affected canes Remove/destroy Adequate water Late dormant applications of lime sulfur, copper, sulforix Other fungicides See Midwest Small Fruit and Grape Spray Guide If no history, pre-bloom probably not needed
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42 Integrated management- Table modified from Midwest Small Fruit Pest Management Handbook Practice Viruses Vert. wilt Good air/water drainage 500 ft from wild Eliminate wild brambles Orange Rust Cane blights P. Mildew Fruit rots Rotation Cultivar resistance Avoid adjacent plantings Disease free stock
43 Integrated management- Table modified from Midwest Small Fruit Pest Management Handbook Practice Viruses Vert. wilt Good air/water drainage 500 ft from wild Eliminate wild brambles Orange Rust Cane blights P. Mildew Fruit rots Rotation Cultivar resistance Avoid adjacent plantings Disease free stock
44 Integrated management- Table modified from Midwest Small Fruit Pest Management Handbook Practice Viruses Vert. wilt Rogue infected plants Improve drying Dispose of diseased canes Maintain vigor Orange Rust Cane blights P. Mildew Fruit rots Fungicides Harvest before overripe Good handling/stor age
45 Integrated management- Table modified from Midwest Small Fruit Pest Management Handbook Practice Viruses Vert. wilt Rogue infected plants Improve drying Dispose of diseased canes Maintain vigor Orange Rust Cane blights P. Mildew Fruit rots Fungicides Harvest before overripe Good handling/stor age
46 Phytophthora root rot
47 Phytophthora root rot Several Phytophthora species affect brambles
48 Symptoms on raspberry
49 Symptoms on raspberry
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51 Root rot - management Site selection Drainage Avoid heavy soils Raised beds Manage irrigation to avoid overly wet soil Cultivars some varieties of red raspberry are less susceptible Fungicides See Small Fruit & Grape Spray Guide
52 Fruit rots
53 Botrytis (gray mold)
54 Botrytis biology Overwinters in many plants, plant parts Fungus spreads by spores Infects flower parts then spreads to fruit, often staying latent Fruit rot activates as it matures/ripens Temps 70-80F, moisture, and high humidity favor disease
55 Botrytis management Pruning to promote faster drying Avoid excess N Fungicides at bloom through petal fall See Midwest Small Fruit and Grape Spray Guide Careful handling at harvest
56 Orange Rust commerical Systemic fungal pathogen often introduced on infected planting material Variability in cultivar resistance Red raspberries not susceptible Bright orange pustules form on bottom surface of leaves in spring
57 Late Rust Severe on red raspberry
58 Managing rusts Use healthy, disease-free planting material Select site with good air movement and sun Eradicate wild hosts Prune/canopy management for airflow Rogue all infected plants as soon as they appear Fungicides see Small Fruit & Grape Spray Guide Resistance Late rust black raspberries and blackberries immune Orange rust red raspberries immune
59 Integrated management- Table modified from Midwest Small Fruit Pest Management Handbook Practice Viruses Vert. wilt Good air/water drainage 500 ft from wild Eliminate wild brambles Orange Rust Cane blights P. Mildew Fruit rots Rotation Cultivar resistance Avoid adjacent plantings Disease free stock
60 Integrated management- Table modified from Midwest Small Fruit Pest Management Handbook Practice Viruses Vert. wilt Rogue infected plants Improve drying Dispose of diseased canes Maintain vigor Orange Rust Cane blights P. Mildew Fruit rots Fungicides Harvest before overripe Good handling/stor age
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