In response to the inquiry by Rob Fetter:
In Mexico, organic control of these fungi is usually achieved by
regulating shade and ensuring good ventilation, pruning shade trees to
eliminate shady spots. This is usually all it takes for Mycena.
Fungal organisms have very specific substrates and so diversifying the
substrate on the leaf surfaces will diversify the fungal populations and
impede any one population from getting out of control. This is done by
applying any of a number of different compost teas every two to four weeks.
This foliar fertilizer also helps balance plant nutrition, the underlying
factor determining fungal disease.
For particularly recalcitrant cases of roya (Hemileia vastarix) (e.g. at
lower altitudes) that do not respond to the above treatments, we have found
the following to be very effective:
To prepare 100 liters you need:
500 g copper sulfate
500 g hydrated lime
600 g zinc sulfate
400 g magnesium sulfate
400 g boric acid
2 plastic tubs (one of them should hold 100 liters)
1 machete or iron bar
100 l water
In the first tub dissolve the salts of copper, zinc and magnesium and the
boric acid in 50 l of water (tub "a")
In the second tub (the one of 100 liters) dissolve the lime in 50 of
Pour solution in tub "a" into solution in tub "b" (never the other way) and
stir constantly until thoroughly dissolved.
If there are residues the solution should be filtered. Place in a sprayer
and apply immediately. Should be enough for about 250 plants. This can be
applied every 30 days as long as the coffee is not flowering. Some people
recommend alternating with "caldo bordoles" (1 kg copper sulfate, 1 kg lime
in 100 l water, dilute 2:1).
As always with micronutrients, this is not a "recipe" but an example that
should be adjusted according to what you know about the specific
nutritional situation you are dealing with.
Mexico, D.F. & San Cristóbal de Las Casas, Chiapas
Tel. y FAX 525-666-73-66 (DF)
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