1046 EXPERIMENT STATION KECORD. 



fiiiiiKl (|iiil«' (l«'striicti\i' t(i swci't unui^ie trees in one of the most imiiort.int 

 citrns-jirowiiij; seetions of Florida. 



'I'lu' disease is primarily one of l);irk antl rind, tlie Mdod Ix'in;; affected imly 

 secondarily. The barlv of the trnidi and of branches of all sizes may l)e 

 affected, but the jireatest injury is done to the younger branches and twigs up 

 to about * in. in diameter and to the fruit. On the branches and twigs, more 

 or loss circular spots i in. or more in diameter are developed, the bark becomes 

 brittle, cracks, and forms small flakes or scales. This may continue for several 

 years until the branch is finally girdled and killed. The formation of rough 

 scaly bark also occurs on the trunks of the badly diseased trees, and the 

 exudation of gum is usually an accomi)animent of the trouble. 



The disease is aiii)arently infectious, and it is believed that it may be spread 

 from tree to tree and from grove to giove. 



Studies in the laboratory and field have so far failed to reveal any organism 

 within the diseased tissue, except CoIlctotricJium ylwosporividcs, the fungus 

 which causes the wither tip. 



Experiments have been carried on for the control of the disease, and the 

 author recommends top-working affected trees, heading back, pruning out, and 

 thorough sjiraying with Bordeaux mixture. 



Fungus diseases of cacao and sanitation of cacao orchards, F. A. Stockdale 

 (J mil. Dipt. A(/r. W'ci^t JniUcs I'ainphlvt .>'/, I'JUS, [tp. .'/?). — In this pamphlet 

 brief descriptions are given of the principal diseases of cacao and of the 

 remedial measures that have proved to be most successful in dealing with 

 these diseases. It appears that the fungus diseases of cacao are quite amenable 

 to treatment, and as the recommendations are simple and practical in character, 

 there should be no difficulty in carrying them out. 



Among the diseases described are the root disease, canker, die back, Lasiodi- 

 plodia, thread blight, witches' broom disease, brown rot of pods, and black rot 

 of pods. 



The publication concludes with suggestions for the proi)er sanitation of 

 cacao orchards. 



Bud rot of the coconut, E. B, Copeland {PhUippinc Agr. Rev. [Englisli Ed.], 

 1 (1908), Xo. 5, pp. 210-220, pi. 1). — An account is given of investigations by 

 the author on the occurrence of the bud rot of the coconut in the Philippines. 

 The disease is reported to be very prevalent in 3 districts and present but 

 doing less damage in several others. The disease is described, and, as a tree 

 once affected is i)ractically valueless, the author recommends that in order to 

 prevent the spread of the disease to other trees all those infected should be 

 burned. A synopsis is given of reports on the occurrence of bud rot in other 

 countries. 



The blue rot of coniferous timber, E. MOncii {Naturiv. Ztschr. Forst u. 

 Landic, 5 {1901), No. 11, pp. 531-573, figs. 28; 6 (1908), Nos. 1, i)p. 32-1,1, figs. 

 3; 6, pp. 291-323, figs. 2). — A study was made of the cause of the so-called blue 

 rot of the wood of various species of coniferous trees and the effect produced 

 by the fungus on the tensile strength of infected timber. 



The author found the trouble to be due jirincipally to what has been called 

 CeratostoDieUa pilifrra, but instead of there being a definite species under that 

 name, it is really a group of allied forms, which have been separated and 

 studied in detail. Thi-ee forms are recognized as new species, C. picecr, C. cana, 

 and ('. coerulca. The first two species are associated with certain species of 

 Graphium in their life cycles. 



In addition to the foregoing fungi, the author found Endoconidiophora 

 ccerulca, a new genus of fungus, attacking pine, fir, and hemlock trees. 



