Controlling Root Rots

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Why Root Rots• Destructive to a wide host range of plants– All plants are susceptible to some kind of rootrot• Economic: Cause large $$ lossessometimes resulting in complete loss ofcrops• Widespread: they are everywhere• Many organisms• Also can be abiotic
Causes of Root Rot• Water Molds (Oomycetes)– Pythium, Phytophthora,• Basidiomycetes– Ganoderma, Armillaria, Omphalotus, Oxyporus,Rhizoctonia• Ascomycetes– Rossalinia necatrix• Deuteromycetes– Fusarium and Fusarium/nematode complexes• Anoxic or Hypoxic soil conditions– Flooding, natural gas leak in soil
Page 1: Controlling Root RotsJim DownerUniv
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 20 and 21: Avocado Root Rot
Page 22 and 23: Phytophthora: symptoms
Page 24 and 25: Ficus• Thinning of foliage isreal
Page 26 and 27: Note pink rot pathogensporulating o
Page 28 and 29: Disease predisposing factors• Exc
Page 30 and 31: Planting Too Deep• Almost always
Page 32 and 33: Stem/Root intersection• Crown of
Page 34 and 35: Anoxic root rots• Due to rootsuff
Page 36 and 37: The toxic proportion• >1 ppm boro
Page 38 and 39: Soil Structure• Soil particles co
Page 40 and 41: Methods and Mechanisms ofPhytophtho
Page 42 and 43: Zoospore motilityCalcium at 1mM con
Page 44 and 45: Calcium control• Calcium supplied
Page 46 and 47: P. Cinnamomi control withphosphorus
Page 48 and 49: Fungicides• fosetyl-Al Aliette•
Page 50 and 51: Mulch-hugger!
Page 52 and 53:
The canopy of the tree should be wi
Page 54 and 55:
Mulch Transect StudiesSurface ofmul
Page 56 and 57:
Organisms seen in MulchesDeutermyco
Page 58 and 59:
• Trees produceabundant roots inm
Page 60 and 61:
Enzyme activities in transectprofil
Page 62 and 63:
Mulch FungiCeraceomycestessulatusCo
Page 64 and 65:
Cellulase effects onZoosporangia/sp
Page 66 and 67:
Integrated Control• Use all the m
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Controlling Root Rots

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