摘要:

SUMMARY1A disease of mangoes, hitherto undescribed, has for the last few years been causing considerable loss to mango growers in the Union.2So far as can be ascertained the disease is not known outside South Africa, and it occurs in this country in the neighbourhood of Barberton and Warmbaths, in the coast region of Natal and at Delagoa Bay.3Dark angular spots are formed on the leaves which do not noticeably affect the general health of the tree, but serve as a source of infection for the fruit. On the latter the disease causes discoloured roughened areas and deep cracking; infected fruit is detached from the tree by the slightest air movement and falls rotting to the ground.4Infection is carried by the wind, and by rain dripping from infected leaves. Very few insects are found on the mango foliage.5Spraying experiments have been conducted which show that spraying with Bordeaux mixture, iron sulphide or Hycol is useless in checking the disease.6The cause of the trouble is a flagellate bacillusBacillus mangi‐feraen. sp. It invades the parenchyma, wedging apart and killing the cells and causing gummosis; lignified tissues are not touched.7The organism is described in detail and a resume is given of its salient character

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1915.tb05424.x

出版商:Blackwell Publishing Ltd    

年代:1915

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1915.tb05425.x

出版商:Blackwell Publishing Ltd    

年代:1915

数据来源: WILEY

摘要:

SUMMARY1The distribution, hosts, and mode of action of Pink Disease are described and its importance as a disease of plantation rubber is emphasised.2The various forms ofCorticium salmonicolorare described. It is pointed out that the fungus is not a typicalCorticiumand that the pink incrustation is very frequently sterile.3Corticium salmonicoloroften affects the wood as well as the bark of rubber trees. Its action on the wood is described in detail. The formation of tyloses appears to be a response to the presence of the fungus in the wood.4Pure cultures ofCorticium salmonicolorhave been established on salep agar and onHeveawood.5Inoculation experiments both with natural material and with the fungus grown in pure culture have been successful.6Treatment, (a)Spraying is not recommended except in particular cases,(b)The disease is best dealt with either by cutting out infected branches, or by treating affected parts with tar. Detailed instructions are given as to the manner in which these operations should be carried out by a pest gang.

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1915.tb05426.x

出版商:Blackwell Publishing Ltd    

年代:1915

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1915.tb05427.x

出版商:Blackwell Publishing Ltd    

年代:1915

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1915.tb05428.x

出版商:Blackwell Publishing Ltd    

年代:1915

数据来源: WILEY