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Abstract: Hybrid white, hybrid off-white, and brown strains oi Agaricus bisporus were compared for resistance to Trichoderma green mold. Yield losses in mushroom weight (g/bag) for seven cropping smdies were measured. Significant differences were detected among hybrid mushroom strains in response to Trichoderma harzianum biotype 4 (Th4) infestation. Hybrid white strains were the least resistant to green mold, sustaining yield losses up to 96%. Hybrid off-white strains exhibited intermediate susceptibility with yield losses of 56-73%. Brown strains were significantly resistant to green mold, sustaining yield losses of only 8-14%. Excessive spawn handling did not have a significant impact on development of green mold. From these findings we propose a continuum of spawn strain resistance, and suggest the use of brown strains to manage green mold outbreaks, particularly where benomyl resistance is a threat.
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