Control of brown blotch disease caused by Pseudomonas tolaasii by some chemical and biological treatments and its effect on some productive traits of the edible mushroom Agaricus bisporus

The research was carried out in a mushroom farm, College of Agriculture, Tikrit University, five microelements were tested, namely, iron, manganese, molybdenum, Zinc and boron, combination these elements, addition biological agent, Pseudomonas fluva, to control the brown blotch disease caused by pathogenic bacteria tolaasii on edible Agaricus bisporus. results showed that all treatments micro-elements as well growth-promoting P. fluva led significant superiority higher productivity A. bisporus fruit bodies compared treatment only. highest reached elements mixture with beneficial which amounted 2675.6 g / 20 kg compost, efficiency 79.59%. At level molybdenum (without bacteria) outperformed other recording 2533.2 2527.4 compost 80.26 79.0% , respectively, lowest 1404.3 45.7 tolaasii. individually decrease infection rate, no rate recorded presence 32%