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New Zealand Plant Protection 67 (2014): 329

Delivering Trichoderma spp. spores via seed coating and storage stability at 20 and 25C

J. Swaminathan, M.J. Wilson and T.A. Jackson

ABSTRACT

Trichoderma species have been reported to augment seedling establishment and provide protection from soil borne diseases. Many Trichoderma products are simply mixed into soil or compost, but seed treatment offers the potential to reduce spore application rates by directly targeting the developing rhizosphere where efficacy is realised. This study evaluated the ability of five formulations, based on oils and/or biocompatible polymers, to adhere Trichoderma spores to wheat seeds and maintain in their initial loading (colony forming units), moisture content (%), water activity (aw) and spore germination (%). Spore loading ranged from 2.2105 - 2.0107 spores/seed, with the xanthan gum-based biopolymer formulation providing the highest loading. Best survival (43% of initial loading) after 3 months of storage at 20C was recorded in the biopolymer-based formulation followed by the polyvinyl pyrrolidone formulation (24%). The remaining three formulations had <10% spore survival. At 25C only the biopolymer formulation had more than 10% survival compared to the initial loadings. These results indicate that Trichoderma spores can be effectively delivered onto seeds using biopolymer technology to produce shelf life stable formulations without compromising the germination quality of the seeds.

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