Compost tea: a new paradigm in biological control of tree diseases and agroforestry crops

Professorial Chair Lecture

Guillermo Ponce Professorial Chair Lecture

Place

Operations Room, Tamesis Hall, UPLB, College, Laguna

Date

6-22-2005

Abstract

Two studies were conducted in the Forest Pathology Laboratory and the Greenhouse to determine the effectiveness of compost tea to control diseases of Mangium and Narra.The diseases of pole-sized mangium were tip blight, brown leaf spot and black leaf spot caused by Pestalotia quercina 1 & 2 and Curvularia geniculata. These were isolated from the infected shoots and leaves respectively. The disease of Narra was leaf spot caused by Pestalotia sp.

Bioassay test was conducted using compost tea and a fungicide Benlate on the pathogens of Mangium and inoculation test on leaf spot development of Narra.

Results showed that compost tea suppressed the growth of Pestalotia quercina 1 and 2 by 31% and 59% and 32.35% for Curvularia geniculata in the bioassay test. The fungicide Benlate totally inhibited the growth of P. quercina 1 and 2 at 50, 100, and 200 ppm. The growth of C. geniculata was partially inhibited by Benlate at 25% for 50 ppm, 40.15% for 100 ppm and 57% for 200 ppm.

Leaf spot of Narra inoculated with compost tea stopped to develop except in leaf spots no. 2 and 11. The average increase in diameter was 0.083 mm. The uninoculated/untreated leaf spot continued to increase in diameter by an ave. of 1.080 mm. The percent inhibition of leaf spot development due to compost tea was 92.3%

The results showed that compost tea can be used to effectively control the common and serious diseases in the Forest Nursery. However more tests must be conducted. The microorganisms in the consortium be identified.

Location

UPLB Main Library Special Collections Section (USCS)

College

College of Forestry and Natural Resources (CFNR)

Language

English

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