748 EXPERIMENT STATION EECORD. 



in the antuiun of 1909 wHli a dressing of al)out ],r)00 lbs. of unslaked lime per 

 acre, followe<l in the spring of the year by an application of about 500 lbs. of 

 sulphur per acre. Upon this an excellent crop of Swedish turnips was pro- 

 duced, and the roots were practically free from disease. Only in one corner 

 of the field was there any disease noticeable. A part of this tract was given 

 a second treatment at the rate of about 1,200 lbs. of unslaked lime to the acre, 

 applied in the autumn, followed in the spring with sulphur as previously. 

 When the crop was harvested, no trace of the disease was found. 



The occurrence at Ardrossan of the corky scab potato disease, D. A. Boyd 

 {GUi^gow Nai., 3 {1911), No. 3, pp. 82-S5). — The author reports on the occur- 

 rence in Scotland of the corky scab potato disease, due to ^pongoapora scabies, 

 and gives a description of the fungus, its methods of attack, and suggested 

 remedies. 



The nematode gallworm on potatoes and other crop plants in Nevada, 

 C. S. ScoFiELD {U. 8. Dept. Agr., Bur. Plant Indus. Circ. 91, pp. 15, figs. 20). — 

 There is said to have occurred in 1910 and 1911 in certain irrigated potato- 

 growing districts in Nevada an outbreak of a potato disease due to nematodes 

 (Heterodera radicicola). In order to supply the demand for information as 

 to the cause, spread, and possible remedies a compilation has been made, bring- 

 ing together such available information as would be useful to potato growers 

 and others. The life history of the nematodes, sources of infection, suscepti- 

 bility of other plants, and possibilities of eradication are discussed. The use 

 of clean seed and nonsusceptible crops is recommended. Where these pests 

 become established in fields they are difficult of eradication, but where possi- 

 ble flooding the ground and keeping it covered for a period of several months 

 will destroy the nematodes and their eggs. Where nonsusceptible crops are 

 used the nematodes will ultimately be greatly reduced in number owing to a 

 lack of suitable food plants. 



List of fungoid parasites of sugar cane observed in Trinidad, L. H. Gough 

 (Dept. Agr. Trinidad and Tohago Bill, 10 (1911), Xo. 69, pp. i77-i8/).— A 

 list of about 15 species of fungi that are known to occur parasitically on sugar 

 cane in Trinidad is given, with notes on some of the more important literature. 



Trichoderma koningi the cause of a disease of sweet potatoes, M. T. Cook 

 and J. J. Taubenhaus {Phijlopathology, 1 {1911), No. 6, pp. 184~1S9, pis. 2).— 

 In the fall of 1910 the authors began a study of the sweet potato disease known 

 locally as ring rot. It occurs as dry rot which spreads in all directions from the 

 point of origin and comjiletely girdles the root, forming a well-detined ring or 

 band of discolored tissue. 



An examination of roots failed to reveal any sign of spores or other struc- 

 tures by which the organism could be determined. Cultures ]u-oduced the fruit- 

 ing organs, and at first the fungus was supposed to be T. lignorum, but material 

 submitted to others led to its determination as T. koningi. A number of sweet 

 potatoes were inoculated with this fungus and within 2 weeks 100 per cent in- 

 fection was secured. Other potatoes inoculated with T. lignorum gave about 

 50 per cent infection, with slightly different sym])toms. The authors state that 

 both these species are the cause of storage rots of the sweet iX)tato, but that 

 T. koningi is of the greater imiiortanee. 



A disease of tobacco in Southern Italy, A. Splendore {Bol. Tec. Coltiv. 

 Tabacchi [Scafati], 10 {1911). No. 3, pp. IJ/l, 1^2, pi. 1; abs. in Internat. Inst. 

 Agr. [i?o»ie], Bui. Bur. Agr. Intel, and Plant Diseases, 2 {1911), No. 7, pp. 1773, 

 1771f). — Under the name " bassar^ " or "verderame" a disease of tobacco in 

 Italy is described. 



It is characterized by the occurrence of green spots on the cured leaves. 

 Sometimes the spots are isolated, while at other times a number are grouped 



