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Abstract: We explored the effect of several factors on the severity of cobweb disease on Agaricus bisporus caused by the fungal pathogen, Cladobotryum dendroides. Experiments were carried out to determine the impact of the disease on mushroom yield using, (1) four levels of inoculum (1, 2, 3 and 5 g/5 kg pasteurized compost), (2) five stages of infection (spawning, 5 days post spawning, 10 days post spawning, casing, and pinning) and (3) five inocula (spore suspension, mycelial suspension, spore and mycelial suspension, wheat bran and sawdust inoculum, and wheat grain inoculum). Yield loss was highest when infection occurred at pinhead stage, irrespective of the inoculum level. Regardless of the stage of infection, yield decreased as the inoculum level increased from 1 to 5 g/5 kg compost. All inocula types produced fewer fruiting bodies when compared to a non-inoculated control treatment. The fewest number of healthy fruiting bodies and the highest yield loss (75%) were observed with the mycelium and spore inoculum, while the highest number and yield of fruiting bodies were obtained with the wheat grain inoculum.
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