;84 



General htdex. 



Sporogenous hyphae 

 Sporophyte or spore-bearing gene- 

 ration . . 

 Staining spores 

 Starvation of host and power of 



infection 

 Sterigma 

 Stinking smut of wheat — 



adaptation to unfavourable 



conditions 

 answers to questions 

 artificial infection of seed . . 

 conditions favouring the 



disease 

 diseases produced in animals 

 duration of germinating 



power . . 

 effects upon the crop 

 germination 

 effect of temperature 

 grains of wheat partially 



bunted 

 infection . . 

 legislation relating to plant 



diseases 

 losses caused by . . . . 4 



proportion of smutty and 



sound stalks in same stool 



Re-infection of seed after 



treatment 

 spores after harvest 

 Stinking smut and Loose smut on 



ears of same plant 

 Stroma 



Stubble burning and flag smut . . 

 Sugar, influence on germ-tubes of 



fungi . . 

 Sulphate of copper, in seed treat- 

 ment for smut . . 

 Sunshine, effect on germination . . 

 Surface markings of spores 

 Susceptibility of different varieties 



of wheat 

 Symbiosis between parasite and 

 host 

 Lolium fungus 

 Systematic selection and bunt- 

 resistance 

 Teleutospore . . . . . . 1 



germination in rusts and smuts 

 Temperature, effect on germina- 

 tion 

 influence on infection 

 Temulin, alkaloid only developed 

 when fungus is pressnt . . 

 Thecaphora 



spore formation 

 Thrips, probably concerned in 



flower infection . . 

 Tillering 

 Tilletia 



spore formation 

 Tilleiiaceae . . . . 142 



Page 

 39 



54 

 109 



Page 



73 



78 

 73 



82 

 136 



77 



75 

 74 



29 



17 



101 



113 

 26 

 12 



47 



59 

 59 



47 

 1, 43 



36 



60 



185 



18 



29 

 35 



190 

 18 



146 



Tilletia levis and T. iritici, on ears 

 of same j^lant 

 on same ear 



relative effect on length of 

 straw . . . . . . 5 



relative virulence of infection 

 Tilletia tritici. effect of diy and 

 moist heat 

 germination of spores 

 spores on stem 

 Tolyposporium 



spore formation 

 TolyiMspotiiiin liuysuin, vitality of 



Toxic solutions fatal to parasites 



Toxins and anti-toxins 



Triticum, species and sub-species 



in relation to bunt 

 Types of germination . . 

 Uninucleate spores 

 I'nit characters 

 Urocystis 



development of spores 



special envelope of sterile cells 

 Urocystis cepulae 



Urocystis occulta, shoot infection 

 Urocystis tritici, biologically dis- 

 tinct from U. occulta 



soil infection 

 Ustilaginaceae 

 Ustilaginales . . 

 Ustilago 



spore formation 



spores free 

 Ustilago avenue, germination of 

 spore . . 



effect of light and darkness on 26 



infection of young seedUng. .29, 104 



effect of low temperature on 36 



soil infection . . . . 30 



treatment of seed . . 

 Ustilago bromivora 

 Ustilago calandriniae, spore diffi- 

 cult to germinate 

 Ustilago cynodontis, indigenous . . 

 Ustilago esculenta, used for food . . 

 Ustilago longissima, spore forma- 

 tion 

 Ustilago maydis (= U. zeae), in- 

 fection 



local 

 Ustilago nmla, conidia not formed 



differences from covered smut 



germination of spore 



infection . . . . . ■'■ 



flower 



inoculation experiments in 

 United States 



mycelium in embryo of barley 



second growth infected by 

 persistent mycelium 

 Ustilago olivacea, germination of 

 spore . . 



promycelium dispensed with 

 Ustilago readeri, germinating 



sjxtres in light and darkness 



germination 



29 

 29 



133 

 54 



27 



. 24 



10 



186 



18 



22 



60 

 60 



130 



14 

 46 

 195 

 19 

 12 

 13 

 34 



. 63, 99 



30 



141, 145 



144 



146 



16 



12 



.22, 103 



106 

 123 



21 



64 



3 



13 



29 

 30 

 24 

 109 

 24, 107 

 29, 107 

 31 



33 

 33 



10 



25 

 126 



