Resource Guide for Organic Insect and Disease ... - Cornell University

Trichoderma atroviridae Efficacy
Good Control Fair Control Poor Control
5
Number of Trials
4
3
2
1
0
Grape -­‐ Botry2s bunch
rot
Grape -­‐ powdery
mildew
Snap bean -­‐ Fusarium
root rot
Potato -­‐ black scurf
Crop -­‐ Pest
Figure 4. Efficacy of T. atroviridae.
Fusarium surface rot of sweet potato with post-harvest treatment, and late blight of potato
with foliar application.
Seed and soil treatments with Trichoderma virens have been tested against soil-borne
pathogens with mostly poor results; one exception was a “good” trial against damping-off in
spinach. Foliar applications have been tested against powdery mildew, downy mildew, and
Sclerotinia drop in lettuce with fair to poor results (Figure 2).
Products containing of mixtures of Trichoderma asperellum and T. gamsii have showed mostly
poor results in soil and foliar applications against a number of pathogens, with the exception of
one “fair” result against Phytophthora blight in summer squash (Figure 3).
Trichoderma atroviride has been tested as foliar applications against Botrytis bunch rot (good
results) and downy mildew of grape (poor results). Results have been poor in soil applications
and seed treatments against Fusarium root rot of snap beans and black scurf of potato (Figure
4).
Foliar applications of Trichoderma lignorum showed poor results against late blight in potato
(one trial only). A soil drench of Clonostachys roseum var. catenulatum gave “fair” control in one
trial against Fusarium root and stem rot in cucumber.
REFERENCES
Biopesticides Registration Action Document. (2010). Trichoderma asperellum strain ICC 012.
PC Code 119208. US Environmental Protection Agency, Office of Pesticide Programs,
Biopesticides and Pollution Prevention Division.
Biopesticides Registration Action Document. (2010). Trichoderma gamsii strain ICC 080. PC
Code 119207. US Environmental Protection Agency, Office of Pesticide Programs,
Biopesticides and Pollution Prevention Division.
Harman, G. E. (2011). Trichoderma-not just for biocontrol anymore. Phytoparasitica, 39,103-
108.
184 Organic Resource Guide