CONTENTS 



Page 



Progress report of the working group 1 



Organization and objectives J. R. Hansbrough 



Accomplishments : Asia 3 



Japan Rokuya Imazeki 



India B. K. Bakshi 



Pakistan A. H. Khan 



Philippines Tiburcio S. Serevo 



Burma H. G. Hundley 



Accomplishments : Europe 16 



Yugoslavia M. M. Krstic 



Czechoslovakia I. A. Kalandra 



Great Britain T. R. Peace 



Accomplishments: North America 21 



Canada V. J. Nordin 



United States Department of Agri- 

 culture J. R. Hansbrough 



United States A. J. Riker 



The threat of introduced diseases T. R. Peace 



Examples of widely distributed forest dis- 

 eases J. R. Hansbrough 



Selected dangerous forest diseases in Asia, Europe, and North America: 



Summary 42 



Dangerous forest diseases in Japan R. Imazeki and K. Ito 



Witches'-broom of paulownia 46 



Bacterial blight of chestnut 47 



Needle cast of larch 47 



Shoot blight of larch 48 



Anthracnose of acacia 49 



Leaf blotch of poplar . 50 



Violet root rot 51 



Needle blight and canker of cryptomeria 52 



Needle blight of pine 53 



Virus disease of chestnut 54 



Gall rust of pine 54 



Needle rust of 5-needle pine 54 



Brown spot of tung 54 



Needle blight of redwood 54 



Dangerous forest diseases in India B. K. Bakshi 



Spike disease of sandal ^ 55 



Deodar witches'-broom 55 



Chir pine blister rust 56 



Spruce rust 57 



Teak leaf rust 57 



Shisham wilt 58 



Casuarina wilt 58 



Sal root rot 59 



Sal top-dying 60 



Khair heart rot 60 



Sal heart rot 61 



Dangerous forest diseases in Yugoslavia M. M. Krstic 



Leaf and twig blight of poplars 62 



Leaf rust of poplars 63 



Bacterial canker of ash 65 



Dangerous forest diseases in Austria Kurt Lohwag 



Introduction 66 



Dieback of pines 67 



Poplar canker 68 



Leaf blotch of horse chestnut 69 



Snow blight of pines 70 



Comments on snow blight Erik B jorkman 



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