340 
Journal of Agricultural Research 
Vol, XIV, No. 9 
the character of growth of the plants and the number and type of spots 
produced, one can make a comparison in a relative way. 
It must be borne in mind, then, that all the inoculations were carried 
out in the greenhouse under conditions of high humidity and tempera¬ 
ture. The condition of the plant also played an important r 61 e in its sus¬ 
ceptibility and resistance to Citrus-canker. By a close study of the plants 
and by the number and type of the spots it is possible to determine in 
a relative way and make comparisons of the susceptibility and resistance 
of the plants used in these experiments. Unless otherwise stated, plants 
have been in good growing condition suitable in each case for develop¬ 
ing infection. 
SUSCEPTIBILITY OF WILD RELATIVES OF THE GENUS CITRUS 
RUTACEOUS PLANTS NOT CLOSELY RELATED TO THE GENUS CITRUS 
Xanthoxylum Bungei 1 Planch. (CPB 11180, seedling), II. 1 2 
A spreading, deciduous shrub or small tree native of North or Central China. 
The plant (12 inches in height) was in fair shape during the early part of the experi¬ 
ment, as the new growth was young and in fine shape for infection. While blister¬ 
like swellings developed soon after inoculation in the case, no canker spots were 
produced. Isolation cultures made from these swellings yielded negative results. 
Casimiroa edulis Lav. and Lex. White sapote (CPB 7923, seedling), II. 
A large tree native of Mexico. 
No spots of any description have appeared on the foliage, although it has been 
completely surrounded by badly infected plants. 
Glycosmis pentaphylla DC. (CPB 2905, seedling), II. 
A small shrub common to the Orient. 
No canker spots have appeared on any of the leaves. 
Claucena Lansium Skeels. Wampi (CPB 7936, seedling), II. 
A low-spreading tree native to South China. 
No spots of any description have developed on the leaves. 
Chalcas exotica Millsp. (Murreaa exotica L.). Orange jessamine (CPB 7975A, 
seedlings), I. II. 
A small tree commonly grown in greenhouses for ornamental purposes. 
No canker spots have appeared on either plant. 
RUTACEOUS PLANTS BELONGING TO TRIBE CITREAE 
Subtribe Aegeinae (Hardsheee Fruits) 
Aegle Marmelos Correa. Bael fruit (CPB 7983, seedlings), I, II. 
A tree native to North India, but widely cultivated in India and surrounding 
countries. 
No canker has developed on the foliage. 
Aeglopsis Chevalieri Swingle (CPB 7633 and 7772, seedling and cuttings), II and I, II. 
A large shrub growing near the coast in tropical western Africa. 
No spots of any description have appeared on the leaves. 
1 The nomenclature used by Mr. W. T. Swingle and others in Bailey's Standard Cyclopedia of Horti¬ 
culture is followed in the article. It is suggested that this work be consulted frequently in this connection 
so that the nomenclature and synonymy of the plants used in the experiments will be clearly understood. 
2 Roman numeral refers to the number of the inoculation experiment. 
