There has been a recent thread with a subthread about mulch for blackspot prevention.
http://forums2.gardenweb.com/forums/load/roses/msg0510234627929.html?84
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Manure was reported as being useful in depressing blackspot.
This thread is being open to alert the readers that manure may help suppress blackspot by another mechanism than discussed in that thread. There are friendly fungi that compete with the blackspot fungi. It appears that a manure mulch encourages the growth of these friendly fungi.
"Trichoderma as a potent fungal biocontrol agent against
a range of plant pathogens has attracted considerable
scientific attention (e.g., Tewari and Mukhopadhyay,
2001; Rini and Sulochana, 2007). Different organic
media like neem cake, coir pith, farmyard manure, and
decomposed coffee pulp also have been suggested for
its multiplication (Saju et al., 2002)."
http://www.jtropag.in/index.php/ojs/article/viewFile/291/182
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Background friendly fungi article:
Title: "Influence of phylloplane colonizing biocontrol agents on the black spot of rose caused by Diplocarpon rosae"
Published in: Journal of Plant Interactions, Volume 2, Issue 4, pages 225-231, (2007)
Authors: Muthusamy Karthikeyana*, Ramanujam Bhaskarana, Subramanian Mathiyazhagana & Rethinasamy Velazhahana
Abstract: "An attempt was made to study the biocontrol efficacy of antagonistic microorganisms in phylloplane of rose cv. Edward to manage the black spot (Diplocarpon rosae) disease. Eight antagonistic microorganisms were tested in vivo against the black spot pathogen. Among these, Trichoderma viride and Pseudomonas fluorescens pf1 reduces the mycelial growth significantly. These two biocontrol agents were evaluated for their ability to induce defense-related enzymes and chemicals in plants. Increased activity of phenylalanine ammonia lyase (PAL), peroxidase (PO), polyphenoloxidase (PPO) and total phenolics were recorded in all the biocontrol agents treated leaves. P. fluorescens Pf1 recorded early and increased synthesis of the entire defense-related enzymes and total phenol within 6 days. The application of biocontrol agents induced the defense-related enzymes involved in phenyl propanoid pathway in addition to direct antagonism, which collectively contribute for enhanced resistance against invasion of Diplocarpon rosae in rose."
Here is a link that might be useful: link for manure encourages friendly fungi scientific article
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