Tolerance level of grafted papaya plants against papaya dieback disease

  • Hassan Mohd-Azhar MARDI
  • Johari Sarip MARDI
  • Noor Faimah Ghazali MARDI
  • Muhammad Zulfa Mohd Razikin MARDI
  • Abdul Razak Mariatulqabtiah UPM


Papaya (Carica papaya) cultivars commonly grown in Malaysia namely Sekaki and Eksotika are very susceptible to papaya dieback disease (PDD), resulting in a reduced production of papaya fruits. As an alternative, grafted papaya seedling using Viorica variety as a highly tolerant rootstock can be introduced for combating PDD. Three grafting combinations of scion/rootstock were used in this study namely Eksotika/Eksotika (E/E), Eksotika/Viorica (E/V) and Viorica/Viorica (V/V). These grafted plants were tested over hot-spot diseased location to evaluate their field resistance levels against PDD. The occurrence of PDD on grafted papaya plants showed that the disease was mostly found in E/E combination with disease severity of 86.7% and disease score of 4.34 on 14 months old plants. Meanwhile, the disease severity and disease score of E/V grafting was 71.0% and 3.55, respectively. The lowest disease occurrence was recorded on V/V plants with disease severity of 34.3% and disease score of 1.72. Based on the disease score, the 14 months old plants showed that E/E has highly susceptible, E/V has susceptible and V/V has tolerance characters against PDD incident. Papaya var. Viorica rootstock has influenced the resistance level of papaya cv. Eksotika scion against PDD.

How to Cite
MOHD-AZHAR, Hassan et al. Tolerance level of grafted papaya plants against papaya dieback disease. Malaysian Applied Biology Journal, [S.l.], v. 50, n. 1, apr. 2021. ISSN 2462-151X. Available at: <>. Date accessed: 21 apr. 2021.