ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017470

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017471

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017472

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017473

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017474

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

摘要:

SUMMARYThrips tabacihas been observed associated with powdery mildew infections on grape, rose, strawberry, cantalope, clover, andOenothera.In dish cultures thrips transferred to mildewed leaves of grape and rose thrived better than those transferred to healthy leaves. The thrips appeared to feed on and destroy established mildew colonies on rose and grape leaves, but were present in such small numbers under field conditions as to be of no apparent economic importance.

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017475

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

摘要:

SUMMARYThis study involves the use of oxygen consumption measurements, made by means of the Fenn differential volumeter, to determine the ability of four species ofAllomyces(A. arbuscula, A. javanicus, A. moniliformis, A. cystogenus) to respire certain nutrient substances. Twenty-two different carbohydrates and amino acids were employed with each species.Peptone, dextrin, aspartic acid, and glutamic acid were respired by all four species ofAllomyces, whereas mannitol, d-arabinose, l-arabinose, glucose, levulose, galactose, lactore, soluble starch, cellobiose, glycine and tyrosine were not respired by any of the species.Differential results were obtained in experiments with maltose, sucrose, alanine, leucine, asparagin, cystine, and arginine-HC1.A. arbusculais capable of respiring eleven of the substrates tested,A. javanicuscan respire six, andA. moniliformisandA. cystogenuscan respire five each. In an interpretation of these findings an attempt is made to correlate the more common occurrence ofA. arbusculain nature with its lack of physiological specialization.The morphological similarities betweenA. arbusculaandA. javanicus, and betweenA. moniliformisandA. cystogenusappear to be correlated with similarities in respiratory metabolism and in the nature of their constitutive enzyme systems.

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017476

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017477

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

摘要:

SUMMARYIncreasing numbers of trees of Pacific dogwood,Cornus NuttalliiAud. and madrona,Arbutus MenziesiiPursh., infected with a pathogen which causes serious cankers on the stems, ultimately girdling and killing the trees, are being found in and near Seattle.The pathogen has been isolated repeatedly and obtained in pure culture from bothCornus NuttalliiandArbutus Menziesii, and in all cases it has been identified asPhytophthora cactorum(L.&C.) Schroet.Several trees of both madrona and dogwood were inoculated with pure cultures ofPhytophthora cactorumobtained from stem cankers, and they subsequently developed cankers identical (in nature and appearance) with those associated with the disease as it occurs naturally. Several of the trees of both species inoculated in the same manner with sterile nutrient agar failed to develop any sign of a canker.The fungus was reisolated from several of the artificially induced cankers, and found to be identical with the original isolants.It is therefore concluded thatPhytophthora cactorum(L.&C.) Schroet., is the cause of a serious stem-girdling canker ofArbutus MenziesiiPursh. andCornus NuttalliiAud.Several of the artificially induced cankers have been scarified to determine the value of this procedure as a control measure. Although there has not yet been sufficient time to observe the final outcome, the scarification has thus far prevented the further spread of the cankers.

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017478

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

摘要:

SUMMARYConant'sobservation thatMicrosporum Audouinidoes not grow on rice medium in contradistinction with any other known species of the genusMicrosporumwas fully confirmed.The incidental observation of the presence of a yellow pigment producing microörganism in the primary culture of a strain ofMicrosporum Audouiniled to the discovery ofB. weidmaniensis, and to the evidence of the phenomenon of a unilateral vital stimulation between these two microörganisms.In the presence ofB. weidmaniensis, Microsporum Audouinidoes grow on rice medium and in certain instances it does even produce perfect perithecia.The mustard-yellow pigment producing, spore-bearing bacillus,B. weidmaniensis, is distinct morphologically and physiologically from all the known species of the GenusBacillus.Its full description is given.B. weidmaniensisis the first representant of the Genus with the distinct property of unilateral vital stimulation on Fungi.

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017479

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor