xvl CONTENTS 
CHAPTER XXIII 
Bup SELECTION 
Paae 
Introductory. . . ee Re ee ee ere 
Efficacy and Pree Gentil i Tans siivaba. SE ares as ba, wee oe 
Budivariationansplamtsac. 2 2) ease anesaie Folia aes ne ans pen arene we MESS 
Bud selection in Coleus... . i op ate are SE ee ea ee ee OO 
Bud selection in horticultural Traarsee aes: 2 fo. CORO CERO 
Performance records as a basis for bud Beleaion Se SMe ae ee eel 
Budimutationsiim: Citrus: -. $2 4-o. 44 ao ee es ee ee eee en 92 
Deciduousktreedruitse.s 0-2 ea ec eee ieee cede ee eee en ee ee OO) 
‘“Pedigreed”’ nurserystock 7 5, 2. 2 2. » #2 5 4 8 @ e aoe oy ee 4 os OOF 
Bud*selection inithepotato, <4) 505 2.95.0 so. Se) © ne eo G4 
Certified seed potatoes . . . ess istity WA Ph ee ee Pe RG ee ee 
Other crops in which bud Pelee ont may Sait OR alec eke Sec a eee OS 
Tamitations:of budiselection: 24. os. s 2. a) oe, ee, ee Pee 3 OO 
CHAPTER XXIV 
BreEeping Dispase RESISTANT PLANTS 
Introductory. . . cee Pays Gare CRE Paves Eos Be Leva wee she, Ae ee OD) 
The causes of plant diseases syed nen 8 Rte the ip beech, ed Bate deme 6 EOD) 
The nature of disease resistance in pits Sato er eres ts, ees Se aap sere AOI 
Disease resistance in natural species .....°......2....... . 401 
Bhylloxerasresistant:orapess = = 42 8 4] ee Gre een ee ey ge e402, 
Endothia-resistant chestnuts... ........., Baha 8) hee AOD 
Blght-resistant pears. . . ene See en Re EeO L 
Breeding disease resistant panones by Teyoridiearion ee ere eS 
Creating rust-resistant wheats . . . . ao heey Rahs Mah. et Food! Sete gees 
Inheritance of disease resistance in other lente Me le eet Senta Ce SR. cee ee 
Breeding disease resistant plants by selection . . 2... . 2... 1... . 416 
CHAPTER XXV 
Puant Breepina Mrrsops 
Introductory. .... be MIURA Pode oy 2 a tsepe Ss DW e Ae ee et eee) 
Need of systematic methods A Avni dear a ay AS, hee hy ey ee AIS) 
Pedigreescultures is oa ss es sea ee es a hee neon see wee er e419 
The Svalof system... By ae ey ee Mae neue’ eeroes wee As 
Variety tests—purposes; difficulties ney alged eT Senescence ae . 427 
Establishing varietal types. . . . ot igh Sh, ese ated tn Om aise ae eS ee aneeP 
Determining best varieties for given ploegtions fia Wi VoA oa ee Gee 8, ee 6 RS 
Strain tests—purpose; difficulties involved. . . 2... 2... 2. 2... . 482 
Plant-to-row tests... A tid he Bie Be Se GO Se Be RR 
Factors that affect experimental results Lee ease ae eran ome a eee AS 
CHAPTER XXVI 
GENERAL CONSIDERATIONS AND CONCLUSIONS 
Pm trOducbory. sao. wis serge sis) sy Ese este sO on ev Meee NUON TE eee ewe ere 47) 
Digitized by Microsoft® 
