CONTENTS 



Introduction 3 



History -> 



Botanical name 3 



Host range ' 



Losses ' 



Terminology 8 



Life history " 



Symptoms " 



Isolation of L. maydis 1- 



Spores * ' 



Morphology of spores 12 



Sporidia 13 



Number of spores and dissemination 13 



Dissemination of spores 13 



Longevity of spores 13 



Germination of spores 14 



Types 14 



In water 14 



In nutrient solution 14 



Effect of temperature 14 



Special stimulants IS 



Methods of inoculation IS 



Application of manure and spores IS 



Injection of spores 16 



Partial vacuum 16 



Whorl inoculation 16 



Spiral loosening 16 



Infection 16 



Local infection 16 



Haploid infection 17 



Composite infection 17 



Formation of galls 17 



Types of hyphae 17 



Formation of chlamydospores 18 



Environmental factors IS 



Moisture 18 



Dry weather 18 



Temperature 18 



Host vigor 18 



Date of planting 19 



Injuries to the host 19 



Rate of planting 19 



Solopathogens 19 



Physiologic specialization 20 



Parasitic differences 20 



Local and nonlocal smut 21 



Phenotypic variability 21 



Mutation 23 



Nature and type 23 



Frequency 24 



Stability 24 



Genetics of U. maydis 25 



Suitable material 25 



Nuclear behavior in germination 26 



Meiosis 26 



3 



