EFFECTS OF SEEDLING AGE AND ROOT WOUNDING ON THE CHARCOAL ROT/ROOT-KNOT DISEASE COMPLEX ON GREEN BEAN

  • A. S. Al-Hazmi Plant Protection Department College of Food and Agricultural Sciences King Saud University P.O. Box 2460 Riyadh 11451 Saudi Arabia
  • A. A. M. Dawabah Nematode Diseases Research Department Plant Pathology Research Inistitute Agricultural Research Center 9 Gamaa St. Giza 12619 Egypt
  • S. N. Al-Nadhari Plant Protection Department College of Food and Agricultural Sciences King Saud University P.O. Box 2460 Riyadh 11451 Saudi Arabia
  • F. A. Al-Yahya Plant Protection Department College of Food and Agricultural Sciences King Saud University P.O. Box 2460 Riyadh 11451 Saudi Arabia
  • H. A. Lafi Plant Protection Department College of Food and Agricultural Sciences King Saud University P.O. Box 2460 Riyadh 11451 Saudi Arabia
Keywords: Macrophomina phaseolina, Meloidogyne javanica, Phaseolus vulgaris

Abstract

The effects of seedling age at inoculation and the mechanical wounding of roots on the development and severity of the disease complex caused by the interaction between Macrophomina phaseolina and Meloidogyne javanica on green bean were examined in two different greenhouse pot experiments. The results showed that disease severity decreased with increasing seedling age at inoculation from 4 to 6 to 8 weeks, and nematode reproduction was suppressed. However, mechanical wounding of the roots during inoculation with both pathogens increased the root-rot index, root galling severity, fungal recovery from roots, and the number of eggs per gram roots produced by the nematodes, consequently decreasing plant growth.

Published
2016-12-01
Section
Articles