February, 1920] PATHOLOGY 57 



394. Coit, J.E., and ROBERT W. BoDQSON. The June drop of Washington navel oranges; 

 a progress report. California Auric Exp. Sta. Bull. 290. P. 201-212. 1918. t. 

 Absts. 2, Entry 273. 



395. Cotton, A. D. Diseases of parsnips. Jour. Bd. Agrio. [London] 25: 61-71. 1918. — 

 Slightly modified and abridged form of article published elsewhere. Sec Hot. Absts. 1, Entry 

 1612.— D. Roddick. 



396. Detwiler, Samuel B. Status of white pine blister rust control in 1918. Axner. 

 riant Pest Committee Bull. 2:4-11. 1919.— A summary of the results of field work con- 

 duit od during 191S in the United States and Canada. In the northeastern states the amount 

 of infection on currants and gooseberries was not as heavy as in the previous two seasons. 

 Many new pine infections centers were found. Bulk of white pines are as yet free from thifl 

 disease. The removal of currants and gooseberries from stands of white pine throughout 

 this area is advised. Results so far obtained are said to warrant this measure as practical. 

 In Maine three demonstration control areas are in operation. The average cost for the 

 removal of Ribes plants was $0.32 for the acre. In New Hampshire cooperative efforts 

 resulted in removing Ribes from 66,652 acres at a cost of $0.39 an acre. A demonstration 

 control area of 1790 acres was established. The average cost was $0.71 an acre. In Ver- 

 mont two control areas were established one of 473 acres and the other of 3053 acres. The 

 cost of Ribes eradication on the first area was $2.47 an acre due to difficult conditions. On 

 the other area it cost on the average of $0.85 an acre. Work was continued in Massachu- 

 setts on several control areas. In one area of 8095 acres the cost was $0.60 an acre. In 

 other areas totaling 10,611 acres, Ribes eradication cost $0.70 an acre. In Rhode Island a 

 control area of 12,115 acres was established. Eradication of Ribes cost $0.28 an acre. Sev- 

 eral check plots were rescouted and it was found that 97 per cent of the Ribes bushes had 

 been removed. No control work was done in Connecticut in 1918. In New York State over 

 a million wild Ribes were eradicated on 15 areas totalling 29,337 acres. The average cost was 

 $1.46 an acre. A demonstration control area of 9344 was freed to the extent of 92 per cent 

 of the Ribes plants, at a cost of $1.14 an acre. — The plants must be cut below the crown to 

 prevent sprouting. Special tools were used for this purpose. Infected pines were found in 

 three localities in Pennsylvania. None of these areas is close to native pine stands. Dis- 

 eased pines were found in two nurseries and in an ornamental planting in New Jersey. In 

 states south and west of Pennsylvania including Delaware, Maryland, Virginia, West Vir- 

 ginia, North Carolina, Ohio, Illinois, Indiana, Iowa, Kentucky, Tennessee, Missouri, Kansas, 

 Nebraska, South Dakota and North Dakota, several thousand plantings of white pine were 

 inspected as well as nurseries growing white pine but no blister rust was discovered. The 

 rust was found in imported pines in one locality in Michigan. Scouting showed the disease 

 present in 10 counties in northern Wisconsin. Surveys in Minnesota showed no new centers 

 that were not known the previous season. In both Wisconsin and Minnesota it is the policy 

 to remove all the pines in and adjacent to infection centers and also, so far as possible to 

 eradicate Ribes in the vicinity of infections. No blister rust was found in the western states. 

 In Quebec Province, Canada, the disease was found in one county on the north shore of the 

 St. Lawrence River. The rust was abundant in southern Ontario but could not be found in 

 northern Ontario. Surveys in New Brunswick, Manitoba, Saskatchewan, Alberta and British 

 Columbia revealed no blister rust. Wild and cultivated Ribes are continuous from Ontario 

 to Alberta. Three experimental areas were established in Quebec and Ontario to determine 

 if white pine can be grown successfully in areas where the disease is present. Ribes are 

 being removed from these areas. A table is appended to this report summarizing the num- 

 ber of Ribes plants to the acre and cost of eradication work for different types of woodland on 

 nine demonstration control areas in the northeastern states. — W. II. Rankin. 



397. D'Herelle, E. Technique de la recherche du microbe filtrant bacteriophage (Bac- 

 teriophagum intestinale). (Technic for isolating a filtrable organism (Bacteriophagum intes- 

 tinale) which is bacteriophagous.) Compt. Rend. Soc. Biol. Paris 81:1160-1162. 1918. — 

 The organism, Bacteriophagum intestinale, possesses a definite antagonistic action toward 



BOTANICAL ABSTRACTS, VOL. Ill, NO. 2 



