viii Contents 



CHAPTER XXXI 



PAGES 



POLLINATION 282-307 



Something new Historical Self-sterility Causes of 

 self-sterility Defective pistils Insufficient pollen 

 Difference in time of maturity between stigma and 

 pollen Impotency of pollen Conclusions Choosing 

 varieties for pollination Blossoming seasons Blos- 

 soming chart Mutual affinities Various groups con- 

 sidered Amount of pollen produced Fruiting value 

 Specific recommendations Table of pollenizers 

 The Domesticas and the Damsons Agencies of polli- 

 nation The June drop Practical conclusion. 



CHAPTER XXXII 



GEOGRAPHY AND CLIMATOLOGY .... 308-316 

 The relationship of the plant to its environment 

 Hardiness Differences in hardiness of plums Spe- 

 cial investigations Hardiness of representative va- 

 rieties Maps Lombard and Bradshaw Ihe Dam- 

 sons Burbank and Kelsey The Americana group 

 The Nigra group The Wildgoose group The Miner 

 group The Wayland group The Chicasaw group 

 Commercial range: The Domesticas The Ameri- 

 canas The Wildgoose varieties Local peculiarities 

 Phenology: Blossoming and ripening seasons 

 Differences in different localities. 



CHAPTER XXXIII 



DISEASES OF THE PLUM 317-337 



Those of parasitic origin: Fruit rot Black knot 

 Shot hole Plum pockets Scab Rust Fly-speck 

 Phoma Powdery mildew Lichens Of Non-para- 

 sitic origin : Gummosis Sunscald Leaf curl 

 Single-tree disease. 



C IAPTER XXXIV 



INSECT AND OTHER ENEMIES OF THE PLUM . . 338-348 

 Curculio Gouger Aphis Scale Borers Tent cat- 

 erpillar Canker worm Bud moth Red spider 

 Bumble flower beetle Other insects Mice. 



CHAPTER XXXV 



COOKING PLUMS ( 349-357 



The culinary usefulness of plums Stewing Canning 

 Preserves Spiced plums Pickled plums Jelly 

 Plum juice Marmalade, jam, or plum butter Dry- 

 ing Uncooked plums. 



