Bani [Pongamia pinnata (L.) Merr.] anthracnose in the Philippines

Issue Date

7-1999

Abstract

A new anthracnose disease of bani (Pongamia pinnata (L.L Merr.), an indigenous species of the Philippines, was first observed in the nursery of the Institute of Renewable Natural Resources (IRNR), College of Forestry and Natural Resources (CFNR) of the University of the Philippines Los Baños (UPLB). The causal agent of the disease was identified as Rhizoctonia hiemalis sp. Nov. (Saksena and Vaartaja 1960). Infected seedlings exhibited the typical symptoms, such as irregular light to dark brown dead blotches on the leaves that merge together to cause death often resulting in premature defoliation, blight, and retarded growth. The incidence of the disease was 100% with the presence of high moisture in the area.The result of the pathogenicity test using the clip method indicated that the pathogen causing anthracnose disease of bani infected seven other species of hardwood seedlings after 3-7 days from contact with the infected leaf. These species were: mahogany (Swietenia macrophylla King), narra (Pterocarpus indicus Willd.), yemane (Gmelina arborea Juss.), bangkoro (Morinda citrifolia L.), and banaba [Lagerstroemia speciosa (L.) Pers. J. However, ipil [Intsia bijuga (Colebr.) O. Ktze], subiang (Bridelia penangiana Hook), and marang [Litsea perrottetii (Blume) F. Vill.] were not infected.Histological examination of the bani leaf infected by R. hiemalis using the clip method revealed that the spongy layer of tissues was first attacked by the pathogen. Hyphae were found intra and intercellularly.

Source or Periodical Title

Sylvatrop: the technical journal of Philippine Ecosystems and Natural Resources

ISSN

0115-0022

Volume

9

Issue

2

Page

1-10

Document Type

Article

Frequency

semi-annually

Physical Description

illustrations

Language

English

En – AGROVOC descriptors

PONGAMIA PINNATA; PLANT DISEASES; RHIZOCTONIA; MORBIDITY; PHILIPPINES

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