The Role of Temperature and Inoculum Concentration in the Development of Tip Necrosis and Seedling Death of Beans Infected with Bean Yellow Mosaic Virus. J. C. TU, Research Station, Research Branch, Agriculture Canada, Harrow, Ontario N0R 1G0. . Plant Dis. 73:405-407. Accepted for publication 2 December 1988. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0405.

The role of temperature and virus concentration on tip necrosis and seedling death of bean yellow mosaic virus (BYMV) was investigated in growth chambers. The development of tip necrosis in BYMV-infected beans is controlled by temperature. The percentage of infected plants that developed tip necrosis increased between 16 and 24 C, but decreased drastically from 24 to 28 C. Temperatures higher than 28 C were inhibitory to the development of tip necrosis in BYMV-infected beans. Temperatures between 16 and 24 C that favored BYMV multiplication resulted in higher virus titer and contributed in part to the severity and percentage of tip necrosis. Death of BYMV-infected bean seedlings was strongly influenced by original inoculum concentration.