. Bacteria in relation to plant diseases. Bacteria; Plant diseases. VAN BREDA DE HAAN'S WILT OF PEANUT. In December 1905, J. van Breda de Haan prepared a paper (Teysmannia, 1906) con- cerning a bacterial disease of the peanut Arachis hypogcca, known as "hamawedang,"and observed by him in October of that year in the departments of Koeningan and Cheribon, Cheribon Residency, Java. The following is an abstract of this paper: The soil in this portion of Java is chiefly red or red brown, sometimes black-sandy, very porous, and occasionally clayey. Often the stiff clay cracks open in times
. Bacteria in relation to plant diseases. Bacteria; Plant diseases. VAN BREDA DE HAAN'S WILT OF PEANUT. In December 1905, J. van Breda de Haan prepared a paper (Teysmannia, 1906) con- cerning a bacterial disease of the peanut Arachis hypogcca, known as "hamawedang,"and observed by him in October of that year in the departments of Koeningan and Cheribon, Cheribon Residency, Java. The following is an abstract of this paper: The soil in this portion of Java is chiefly red or red brown, sometimes black-sandy, very porous, and occasionally clayey. Often the stiff clay cracks open in times of drouth. Irrigation is largely practiced and rotation of crops, c. g., sugar-cane is planted for cuttings every third year, then katjang tolok (Phascolus radiatus), after which the peanut (katjang soeoek, katjang holle) is planted, followed by rice. Much care is usually given to the culture of katjang soeoek, low beds of about a yard wide by 4 yards in length with shallow channels be- tween them being used for this purpose. The channels render irriga- tion easy and also allow of thorough drainage and easy access to the plots for weeding, etc. The fields are irrigated every week or less often. There is no trouble any- where from ground- water. The variety of Arachis hypogcca used chiefly is the katjang holle or Bandoeng, which ripens in about 3 months from date of planting. It is planted chiefly in the East Monsoon in fields that can be irrigated. The product is sold to Chi- nese merchants, who in recent years have paid good prices for it, making it a very profitable crop, which accounts for its wide cultiva- tion ; and in view of this fact it can readily be seen how a disease which formerly scarcely drew attention should now be considered a serious problem, especially because the yield of katjang holle has noticeably decreased, being sometimes but half a normal crop. Insect injuries were not numerous in the fields examined by van Breda de Haan, and the only fungus disease me
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