Survival, spread and pathogenicity of Colletotrichum truncatum (Schw.) Andrus and W.D. Moore on seeds of soybean (Glycine max (L.) Merr.) /
Meity Suradji Sinaga.
- Los Baņos, Laguna : Cavite State University- Main Campus, 1982.
- 115 pages : illustrations ; 28 cm.
Thesis (M.S. - - Plant Pathology) University of the Philippines, College, Laguna.
Includes bibliographical references.
MEITY SURADJI SINAGA, University of the Philippines at Los Banos, September 1982, Survival; Spread and Pathogenicity of Colletotrichum truncatum (Schw,) Andrus and W, D, Moore on Seeds of Soybean (Glycine max (L.) Merr.) | Major Professor: Dr, Tricita H, Quimio
Three experiments were cond ted to evaluate the effects of seed inoculation, storage longevity, storage temperature, seed-treatment and their interactions on the survival, spread and pathogenicity of C. truncatum on soybean seeds, variety UPL~SY2,
Results show that C. truncatum either on infested o infected soybean seeds can survive during storage at either room temperature (2 936°C) or at low temperature
There was no significant difference (P > 0,05) inC. truncatum infection percentage during storage at room temperature and at 5°C, Untreated~seeds had a higher percentage of C. truncatum infection than seeds treated with 1% NaOcl,
C._truncatum from artificially~inoculated seeds can infect other healthy seeds, The fungal spores can be also disseminated by adherence on the surface of inoculated seeds. There was no significant difference (P > 0.05) in the spread of C. truncatum among the seeds stored at room temperature and at 5 C, However, longevity of storage of treated seeds had significantly affected the spread of C, truncatum, The highest percentage of spread of the fungus was noted at o-month storage wherein 35.50% of seeds were infected with C. truncatum. The use of 1% NaOCl seed-treatment can minimize the spread of the fungus,
Three types of seed and seedling damage were exhibited by artificially~inoculated soybean seed: seed-rot, seedling- blight, and cotyledon or stem infection, The first two caused reduction in seed germination, whereas seedlings with the latter type of damage still developed after 14 days of planting.
The percentage of seed-rot was significantly (P < 0, 0) affected by storage longevity, storage temperature, storage longevity x storage temperature interaction, and storage longevity x storage temperature x seed-treatment interaction factors, The highest percentage of seed-rot (84.5%) was recorded 4 months after storage at room temperature.
Seedling-blight symptom was influenced only by longevity of storage: 4 months of storage resulted in the lowest percentage (3.75%) of this incidence.
Cotyledon or stem infection was significantly (P< 0, 01) affected by storage longevity, storage temperature, seed- treatment, and interaction of storage longevity x storage temperature, Unstored seeds and those stored for 4 months showed lower percentage of this type of infection than those that were stored for 1, 2 and 3 months, Seeds which were stored at room-temperature and tested with out 1% NaOCl treatment had lower percentage of cotyledon or stem infection than those that were stored at 5C.