168 PATHOLOGY [Bot. Absts. 



1158. Bruner, S. C. Caida de las nueces e inclinacion de las hojas del cocotero en Cuba. 

 [Nut fall and leaf droop of coconuts in Cuba.] Revist. Agric. Com. y Trab. 2: 96. 1919.— In 

 the December (1918) number of the Cuba Review Fox erroneously locates the above named 

 disease in Cuba, perhaps mistaking the bud rot for it. — F. M. Blodgett. 



1159. Bruner, S. C. Un honguillo parasito del tincitido de la higuereta. [A fungus para- 

 site of an insect on the castor bean.] Revist. Agric. Com. y Trab. 2: 218.-219 1919. — Insects, 

 Corythuca gossypii, of the castor bean were found to be affected by the fungus Sporotrichum 

 globuliferum. Artificial inoculations were successful, but it was thought that as a com- 

 mercial means of control it Would be no more successful than against the chinch bug in the 

 United States.— F. M. Blodgett. 



1160. Bruner, Stephen C. La preparaci6n del caldo bordeles. [Preparation of Bordeaux 

 mixture.] Revist. Agric. Com. y Trab. 2: 62-63. 1 fig. 1919. 



1161. Clark, C. F. The potato industry in Colorado. Potato Mag. l u : 8-9, 22; 1": 14- 

 15, 29. 8 fig. 1919.— See Bot. Absts. 3, Entry 920. 



1162. Clinton, G. P. Prematuring and wilting of potatoes. Potato Mag. I 12 : 12-13, 24. 

 1919. — Discusses malnutrition due to potash deficiency, with regard to effects, contributing 

 factors, and control methods. — Donald Folsom. 



1163. Condit, I. J., and H. J. Stevens. "Die-back" of the fig in California. Monthly 

 Bull. Comm. Hortic. California 2: 61-63. Fig. 81-35, 1919.— There have been identified two 

 forms of die-back of the fig tree in California. One form is described as showing small pus- 

 tules of a fungus which encircles the limb just below the new growth on the older wood. When 

 such limbs are split longitudinally a distinct darkened and discolored area is present at the 

 point where the sporulating pustules were found. The branch dries out and becomes very 

 hard and brittle with the bark closely attached. A Botrytis, probably Botrytis cinerea, is 

 believed to be the causal organism. Field observations indicate that infection starts in the 

 fruit, and the mycelium after penetrating the fig works its way down into the wood. At this 

 point it comes to the surface and produces conidiophores. It remains local and kills only 

 that portion. In pure cultures, the junior author found conidiophores were produced in eight 

 to ten days in either prune or plain nutrient agar. — The second form exhibits no fruiting 

 bodies on the outside of the limbs, but shows, when split open, a shrinking of the pith and the 

 presence of sclerotia of various shapes and ranging in size from a small pea to a body 12 to 

 15 mm. in length and 5 or 6 mm. in width. The bark becomes softened and shreds off. The 

 inner tissues are softened and pithy in texture. This trouble is caused by a Sclerotinia, 

 probably Sclerotinia libertiana. A theory is offered concerning the method of infection, in 

 that following frost damage, the tips of the limbs become susceptible, and that during the cold, 

 damp days following, apothecia may be formed from sclerotia lying in dead twigs or on the 

 ground and spores set free which are blown to the leaves and twigs by the wind. The sclero- 

 tia germinate well in both plain nutrient, and prune agar, and small sclerotia can be seen form- 

 ing within nine days. — E. L. Overholser. 



1164. Coons, G. H. A Phoma disease of celery. Rept. Michigan State Bd. Agric. 1917: 

 485-496. 1917 (1918). — Reprint Michigan Special Bulletin No. 81, being a popular presenta- 

 tion of the facts concerning this disease. — G. H. Coons. 



1165. Coons, G. H. Report to the Botanist. Rept. Michigan State Bd. Agric. 1917: 

 297-303. 1917 (1918). — The writer reports plant pathological work carried out during the fiscal 

 year ending July 1, 1917. Experiments on control of grain smut, celery diseases, and trans- 

 portational diseases are reported. The production of anaphylactic shock in guinea-pigs with 

 Fusariums of various species is reported. Experiments on the control of smut diseases using 

 the concentrated formaldehyde method are given. Fusarium oxysporum is reported as 

 invading the root system of potatoes following death of roots by drought. The introduction 

 of black leg of potato (Bacillus) into the Lower Peninsula is described. — G. H. Coons. 



