1019] DISEASES "I PLANTS. 



[Cfuignardie bidtoeUU) as regard outbreaks, both primary u ndary, and 



appropriate treatment, in connection with methods <>f preparing fungich 



Control of brown rot, J. A. ( 'ami-hki.i. {.lour. Agr. [NmD /.<<il.\, lil {1018), 

 No. J/, pp. 221, 222).-- A provisional report is made on experiments continued DOT 



three years on the same plan as those carried nut at AratakJ ami aoted below. 

 These are said to have given valuable Information hut a comparatively .>n^ht 

 degree of present success in control of brown rot Previous Indications in 

 favor of summer spraying for this trouble have not been confirmed, although 



the tests were vitiated considerahly through abnormal conditions. 



Brown rot experiments at Arataki, T. E. Roods (■lour. Agr. < \< ic Seal), U 

 (1918), No. b, pp. 222-228). — Spraying tests on brown mi of peaches ami me- 

 tarules gave no decided results owing to unfavorable weather conditions' All 

 the copper compounds at the strengths used were injurious to hoth fruit ami 

 foliage, and their fungicidal effects were uncertain. Sprayii g Cot bfOWB 



rot of apricot gave the hest results for Bordeaux mixture, which, bowever, 

 disfigured the fruit. Very good results were obtained by the use of lime 

 sulphur. The tests on apricot rust were not decisive. 



Algal disease of cacao, J. B. Rorek (Proc. Agr. Soc. Trinidad and Tobttgo, 11 

 (1911), No. 9, pp. 81,5-81,8; aba. in /»;/<. l>< pt. Agr. West Indies, Rpt. Agr. i>< v t. 

 St. Lucia, 1911-18, pp. IS, Ik; Agr. News [Barbados], 11 (1918), So. .;..'/. ,». 

 190). — Since 1912 the author has observed a disease of cacao due to the pn 

 ence of an alga, Cepholeuroi viresc* as, said also to attach tea and mango in 

 India. It is said to check the normal growth of the twigs, silling the outer 

 hark and allowing entrance to other disease organisms which may kill the 

 hranch down to the main trunk of the tree. Apparently the alga may attack 

 almost any cacao tree, but it is more injurious to weak trees on areas which 

 are Insufficiently drained, poorly shaded, or exposed to the wind. 



A root rot of orange in Tripoli, G. Leone {Agr. Colon. [Itahi], 12 <r.'l^>. 

 No. 4, pp. 209-215, figs. J,). — A root rot of orange is described which has cause d 

 considerable damage for some time in Tripoli. It is found even on certain 

 sandy soils if they are underlaid by layers relatively Impermeable to water. 

 The trouble may also be connected with deep planting, abundant organic fer- 

 tilizer, and overabundant irrigation. Certain varieties nre measurably 

 Blatant. 



The susceptibility of a nonrutaceous host to citrus canker. 11. A. I. if. and 

 E. P. Mf.kiuix (Science, n. ser., J,9 (1919), No. 727.')'. pp. )'.>:>. 500).— The results 

 are given of a cooperative investigation made by the Bureau of Plant In- 

 dustry. IT. S. Department of Agriculture, and the Philippine Barest! <>f Science. 

 In this, inoculation experiments repeated several times have shown that 

 Lansium domesticiim, a tree cultivated in the Philippines for its edihle fruit, 

 may be infected by Pseudomelia* cilri, the cause of citrus cank 



Root disease of tea, R. D. Anstead (Planters 1 Chmn.. /.? (J k. 2.1. p. 



S9J,).— A case is said to have been reported In which tea was 

 fatal root disease, supposed to have spread from dead or dying roots OS) stumps 

 of Erythrina lithospenna. 



Black rot of chestnuts. L. Mangtn (Compt. Rend. Ami. Agr. Fran. 

 (191S), No. 82, pp. 885-889).— Studies carried out during and since l'.MT have 

 convinced the author that black rot is a very Important dls cheatmi 



Of one lot of nuts examined. 26 per cent were affected with Mack ret This 

 said to be due entirely to a fungus, Harviella oa which cans active 



evaporation, resulting in a great decrease of s, inv gravity, this fart bel 



utilized to separate the diseased chestnuts. The fungus .Iocs not attack the 



