Volume 4 Part 1 Article 46
Title: Some Observations about Diseases on Mushroom Farms in Holland
Author: M. Van Der Vliet
In Holland modern mushroom growing started less than 10 years ago. Before 1950 there were one or two rather modern farms, but the main mdustry was to be found in the limestone caves in the South-Eastern tip of the country. These original growers working in the limestone caves did not have contact with the Plantenziektenkundige Dienst (Plant Protection Service) or any other governmental horticultural service.
My experience with mushroom diseases started around 1952. I need not say here that wet and dry bubble, bacterial spot, cobweb diseases and many other troubles appeared in numbers soon after mushroom growing had moved from the cool caves (10°C = 50°F) to the warmer houses. One thing, however, was remarkable. Bacterial spot and dry bubbles occurred regularly in the caves. The former Experimental Station for Mushroom cultivation which was in operation from 1944-1952 in Houthem near the caves never found wet bubble. If a bubble disease was reported it was always found to be dry bubbles.
We do not know for sure but superficial investigation makes us suppose that this is a question of temperature. Although in pure culture the mycelium of Mycogone (agent of wet bubble) grows as fast as the mycelium of Verticillium (agent of dry bubble) at temperatures of 10°C. At this temperature Mycogone forms abnormal mycelium, three or more celled chlamydospores, while the hyphae consist of short rounded cells. The tips are very thick walled. Conidia are very scarce.Please login to download the PDF for this proceeding.