1915] 



381 



D1VJLA X J 



Oreodoxa 



LI Ul\\y ± Vj±X±2\.±J A 



Beta 



Prosopis ( ?) 



Syr in ga 



Richardia 



Amaranthus 



Erythrina 



' Olea 



Amorphophallus 



Dianthus 



Geranium 



Fraxinus 



Hyacinthus 



Delphinium 



Pelargonium 



Strychnos 



Allium 



Papaver 



Tropaeolum 



NerUwn 



Lilium 



Brassica 



Citrus 



Tectona 



Iris 



Raphanus 



Cedrela 



Verbena 



Ixia 



Cheiranthus 



Man i hot 



Capsicum 



Gladiolus 



Matthiola 



Mangifcra 



Solanum 



Musa 



Amelanchier 



Euonymus 



Lycopersicum 



Zingiber 



Sorbus 



Vitis 



Nicotiana 



Dendrobium 



Eryobotrya 



Gossypium 



Physalis 



Cattleya 



Pyrus 



Malva 



Petunia 



Oncidium 



Cydonia 



Sterculia 



Datura 



Odontoglossum 



Prunus 



Elodea 



Calceolaria 



Cypripedium 



Rub ns 



Begonia 



Sesamum 



Phalaenopsis 



Crataegus 



Opuntia 



Pavetta 



Vanilla 



Fragaria 



Eucalyptus 



Psycotria 



Salix 



Rosa 



Oenothera 



Benincasa 



Populus 



Heteromeles 



Aralia 



Cucumis 



Juglans 



Dolichos 



Hedcra 



Cucurbita 



Castanea 



Lathyrus 



Car ota 



Citrullus 



Corylus 



Indigofera 



Pastinaea 



Sicyos 



Morus 



Kraunhia ( ? ) 



Levistieum 



Echinocystis 



Pouzolzia 



Lupinus 



Apium 



Ageratum 



Cannabis 



Mucuna 



Arbutus 



Chrysanthemum 



Acalypha 



Phaseolus 



V accinium [ 



Lactuca 



Humulus 



Vigna 



Ardisia 



Blumea 



Ficus 



Pisum 



Crispardisia 



Synedrella 



Rheum- 



Trifolium 



Amblyanthus 



Tragopogon 



Polygonum 



Med lea go 



Amblyanthops: 



is Bellis 



Atriplex 



Arachis 



Diospyros 1 



Aster 



Spinacia 



Acacia 



Ligustrum i 





PERIOD OF GREATEST SUSCEPTIBILITY 



In certain diseases the brief seedling stage of the plant is 

 the one most subject to attack, e. g., Stewart's disease of maize 

 due to Bacterium Stewarti, and brown rot of tomato and to- 

 bacco due to Bacterium Solanacearum, but many bacterial 

 diseases of older plants are also rather strictly time-limited. 

 In both groups it is a question of abundant immature tissue. 

 To the latter class belong the numerous leaf-spots, fruit-spots, 

 and blights, e. g., black spot on the plum and peach, due to 

 Bacterium Pruni, and fire-blight of the pear, apple, quince, 

 etc., due to Bacillus amylovorus. In such cases, so far at least 

 as they occur in temperate climates, the disease appears in 



