Mark Bolda UCCE February 5 2020 Introduction What are the zygomycetes Biology of the zygomycetes Epidemiology of the zygomycetes Management of the zygomycetes Leak rot Mucor Leak Rots ID: 933355
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Slide1
A Discourse on the Zygomycetes
Mark Bolda
UCCE
February 5, 2020
Slide2Introduction
What are the
zygomycetes
?
Biology of the
zygomycetes
Epidemiology of the
zygomycetes
Management of the
zygomycetes
Slide3Leak rot Mucor
Slide4Leak Rots Mucor
Slide5Leak rot Mucor
Slide6Leak rot Rhizopus
Slide7Rhizopus
Slide8NOT Botrytis gray mould
Slide9Worldwide problem
Saher
Khan with
TradeKing
in Zambia, Africa “
fruit become watery a day after harvest, soft cottony feel with exudation of liquid after that”
Slide10Morphology
Hyphae are 10 – 20 micrometers wide
Coenocytic
Sporangiophores
attached to
stolons
that attach to substrate by rhizoids.
Homokaryotic
Slide11Slide12Biology
Colonize dead organic matter and debris.
Form a resilient structure called a
zygospore
to resist drying and weathering.
Slide13BiologyPectolytic
Activity
Enzyme produced by the fungus lyses cell walls, causing the leak.
Enzyme alone is heat stable, and continues to function even in absence of the fungus.
Slide14Epidemiology
Found in soil in the absence of strawberry
Gain entry to strawberry fruit by wounds and bruising.
Active around 65
o
F and up.
Slide15What are the scientists doing for you?
Slide16Extension
Progressive Crop Consultant, Sept/Oct 2019
Slide17Research: Management
Refrigeration to limit disease advancement – some species grow at temperatures down to 32
o
F.
In field sanitation to reduce inoculum.
No touch of leak fruit to reduce spread of spores.
Quality control to reduce packing rotten fruit.
Slide18Research:Fungicides
Botran
– not registered for strawberry, many MRL restrictions.
Implementing fungicidal screens spring 2020, with an eye to field trials in the fall of first candidates.
Slide19