342 Journal of Agricultural Research voi. xix, No. g 



those found on Casimiroa edulis were observed, occurring at wounds and scratches. 

 Spots have appeared occasionally since that time, but in every case they were observed 

 along scratches and wounds and remained unruptxu-ed. All inoculations in the field 

 were negative even at wounds. 

 Aeglopsis Chevalieri Swingle. (CPB 7633 and 7772, seedlings and cuttings), II and I,^ 



in field, 1918. 



The plants, although producing an abundance of new growth, have remained free 

 from canker, in both the greenhouse and field. 



Chaetospermum glutinosum (Blanco) Swingle {Limonia glutinosa, Blanco), Tabog 

 (CPB 7799 and 7814, seedlings), I, II and I,^ 11,^ III, in field, 1917 and 1918. 



An abundance of new foliage was produced by all the plants, and thus they have 

 been in an excellent condition for infection. All five of the plants have developed 

 canker. The spots first appeared in April, 1918, three weeks after the last inoculation. 

 The spots were at first small and nontypical (PI. 58 A), but as they increased in num- 

 bers they became more and more typical. At the last reading the percentage of in- 

 fected leaves ranged from 10 to 30, and from a few small, oily, unruptured spots (PI. 

 58, B) to many medium-sized, ruptured spots (Pi. 58, C). No spots have been found 

 on the twigs. 



The small , unruptured spots generally appeared at wounds or scratches and resemble 

 those described for Casimiroa edulis. The more normal spots are medium-sized, of a 

 brick color, almost flat, compact, and slightly corky. They do not break through 

 the upper surface but appear as a flat, discolored spot. The oily outline is very indis- 

 tinct around the unbroken spots, and the yellow zone is absent. Vigorous colonies 

 of Pseudomonas citri were isolated from these ruptured spots. 



Unfortunately these plants are very susceptible to low temperatures and have been 

 killed in the field each season, so that no thorough test of their susceptibility has been 

 made. However, judging from the susceptibility shown in the greenhouse, they 

 should be successfully inoculated in the field under favorable conditions. No posi- 

 tive results have been obtained so far, although the plants were repeatedly inoculated 

 during the summers of 1917 and 1918. 

 Balsamocitrus Dawei Stapf. (CPB 2920, on Aeglopsis Chevalieri), III, in field, 1917 



and 1918. 



This is a large tree found in the forests of east central Africa at an altitude of 2,000 

 to 3,000 feet. The plant, although making a rapid growth, has remained free from 

 canker in the field and the greenhouse. 



SUBTRIBE FeRONINAE (HaRDSHEI,!. FrUITS) 



Feronia limonia (Corr.) Swingle (F. elephantum Corr.). Wood-apple (CPB 2763, 



seedlings), I, II, in field, 1917 and 1918. 



A few oily, unruptured spots were observed at the July, 1918, reading. The spots 

 have become more numerous and are scattered over the new foliage, especially at 

 wounds, but remain small and unruptured. They are typical in all respects to those 

 described for Casimiroa edulis. No positive results have been obtained in the field. 

 Peromelia lucida Swingle. Kavista Batu (CPB 7882, seedlings), I, II, in field, 1917 



and 1918. 



Some small, very slow-growing, oily spots are scattered over the new foliage. They 

 resemble in all respects those found on Feronia limonia. Repeated inoculations in 

 the field have been negative. 



J Included in experiments of March 21, 1918. 



