Controlling Root Rots

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Diagnosis: symptoms• Wilt whole plant death• Yellowing• Dieback at the top of the tree/shrub• Cankers– Oxidized tissue– Spreading above ground• Feeder root rot
Page 1 and 2: Controlling Root RotsJim DownerUniv
Page 3 and 4: Causes of Root Rot• Water Molds (
Page 5 and 6: Phytophthora Life History• Myceli
Page 7 and 8: Chlamydospores• Long-term surviva
Page 9 and 10: Cysts germinate and then infect aft
Page 11 and 12: Roots• Roots are often dark ormel
Page 13 and 14: Healthy vs. Not
Page 15: PhytophthoraWhat is it?• A micros
Page 21 and 22: • Bleeding exudates onthe woody s
Page 23 and 24: Phytophthora:symptoms
Page 25 and 26: Damages many ornamental trees
Page 27 and 28: Palm Root RotPhytophthora nicotiane
Page 29 and 30: Flooding is deadly if Phytophthora
Page 31 and 32: The vascular cambium• A meristema
Page 33 and 34: • Backfill surrounding atree can
Page 35 and 36: Soil Salinity
Page 37 and 38: Soil Composition• Pores• Water
Page 39 and 40: Earth transport + compaction
Page 41 and 42: Gypsum MulchesProvide a slow releas
Page 43 and 44: Zoospore encystmentHigh calcium lev
Page 45 and 46: Phos. Acids• Phosphorus acids hav
Page 47 and 48: Effect of various phosphorus acidso
Page 49 and 50: Other fungicides/agents• Phosphor
Page 51 and 52: Effects of organic mulches• Soil
Page 53 and 54: The rhizosphere• As a concept it
Page 55 and 56: Soil Fungi
Page 57 and 58: Mulch full of fungi
Page 59 and 60: Organic Matter: Benefits•Many mul
Page 61 and 62: Enzyme meltdownCellulaseNo enzymes
Page 63 and 64: Response of P. cinnamomi to mulch a
Page 65 and 66: Mulch effects• Mulches provide th
Page 67:
Conclusions• Organic mulches prob
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Controlling Root Rots

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