An Infection Model of Apple White Rot Based on Conidial Germination and Appressorium Formation of Botryosphaeria dothidea

Kim, Ki Woo; Kim, Kyu Rang; Park, Eun Woo

doi:2005.21.4.322

Plant Pathol J > Volume 21(4); 2005 > Article

The Plant Pathology Journal 2005;21(4):322-327.
DOI: https://doi.org/10.5423/PPJ.2005.21.4.322 Published online December 31, 2005.

An Infection Model of Apple White Rot Based on Conidial Germination and Appressorium Formation of Botryosphaeria dothidea

Ki Woo Kim, Kyu Rang Kim, Eun Woo Park

Abstract

Regression models for determining infection periods of apple white rot were developed based on conidial germination and appressorium formation of Botryosphaeria dothidea. A total of 120 apple fruits were inoculated with the fungal conidial suspension and subjected to 6 temperatures and 10 wetness periods. Conidia germinated and produced appressoria, exhibiting swollen tips of germ tubes on the fruit surface. Conidial germination (G) increased with temperature (T) and wetness period (W), and was described as G = -89.273 + 7.649T + 7.056W - 0.109T2 - 0.085W2 - 0.066TW (R2=0.75). Less than 2 hr of wetness period were enough for conidia to germinate at 25 to 30

Key Words: apple, appressorium, Botryosphaeria dothidea, germination, white rot