Predac .fungi j9 



fun<^i produced, almost invariably, negative results. Hy opinion is 

 that for the fungi to become effective there must be some kind of a 

 stimulus which will shift the balance of the fungus from the sapro- 

 phytic to its predacious phase. I think the presence of eelworms is 

 one of those factors. It is quite possible that the effect of the 

 organic matter is that it increases the numbers of saprophytic eelworms, 

 which, in turn, stimulate the predacious fungi. 



In closing, I would like to mention an excellent book dealing with 

 biological control. It is the French book, Parasites (animaux et 

 vegetaux) des Heljninthes by Robert Dollfuss.-Ji- It is a very good 

 account of all the nematode- at tacking fungi known up to the beginning 

 of I9U6. As far as I can make out, it is quite complete, and nothing 

 has been left out. 



^<r (Editor's note) The book by Dollfus is part XXXVII of the Encyclo- 



pedie Biologique. It may be available directly 

 from France from Paul Lechevalier, Editeirr, 12 kue de Touron, Paris VI. 

 The price used to be 2^00 fr. It can also be obtained through Stechert- 

 Hafner, Inc., 3I East 10th Street, New York 3, New York, for about 

 $15.00. 



Dr. Duddington has written a book on this subject called The Friendly 

 Fungi . It is printed by Faber and Faber, 2k Piussell Square, London, 

 W. C. 1, England. The book is to be published in this coimtry by 

 Macmillan Company, New York. The price of the book purchased from the 

 publisher in England is about ;il;3.00. This is a very interesting 

 account of the various predacious fungi, how to find and culture them, 

 and their potential as a nematode control. The book is illustrated 

 with drawings and photographs. 



There is also a review written by Dr. Duddington which can be purchased 

 for about r;iil.00 from the Botanical iteview. Box 7U9, Lancaster, Pennsyl- 

 vania. The citation is Fungi that attack microscopic animals . Sot. 

 Hev. 21(7):377-U39, July 1955. 



(Editor's note) On another day at the Workshop Dr. Duddington was 

 invited to speak concerning biological control 

 experiments. Much of the material he presented is available nov, in 

 a more detailed manner than can be presented in these Proceeding, in 

 his book. The Friendly Fungi . However, some of the other parts of the 

 discussion session are printed here. 



There seems to be a very definite tie-up between organic matter in the 

 soil and the action of the fungi. Organic matter seems, in some way, 

 to act as a stimulus to the fungus. I think Dr. Linford's expl.nnation, 

 that the increase of organic matter produces an increase in the-popu- 

 lation of saprophytic nematodes and that in turn reacts on the fungus, 

 is as good an explanation as yet has been found. It certainly ties up 



