Controlling Root Rots

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Integrated Control• Use all the methods discussed today– Mulching– Fungicides– Planting on mounds (berms)– Water management– Resistance
Conclusions• Organic mulches probably have variedroles in the suppression of diseases in soilParasitism, enzymes and soil modification.• Phosphorus acids are effective but alike• Calcium ion can be used as therapy
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Controlling Root RotsJim DownerUniv
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Causes of Root Rot• Water Molds (
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Phytophthora Life History• Myceli
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Chlamydospores• Long-term surviva
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Cysts germinate and then infect aft
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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
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Controlling Root Rots

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