Identification and control of major seed potato storage diseases in Benguet and Mountain Province, Philippines / by Janet S. Luis

By: Material type: TextTextLanguage: English Publication details: Indang, Cavite : 1987. Cavite State University- Main Campus,Description: 132 pages : illustrations ; 28 cmContent type:
  • text
Media type:
  • unmediated
Carrier type:
  • volume
Subject(s): DDC classification:
  • 635.21  L96 1987
Online resources: Abstract: LUIS, JANET.S, University of the Philippines at Los Banos, November 1987, Identification and Control of Major Seed Potato Storage Diseases in Benguet and Mountain Province, philippines, In a four-year survey (19831986) undertaken to identify major seed potato storage pathogens in Benguet and Mountain Province, Fusarium sambunicum, E, solani, Rhizoctonia solani, Pseudomonas solanacearum (biovars I and II) and disease complex of F. solani +R, solani and occasionally F, solani with Streptomyces scabies were encountered and isolated from diseased tubers, Except F, sambunicum, all pathogens were consistently present in all survey sites throughout the survey seasons, F, solani was more virulent than F, sambunicum, All pathogens were capable of causing extensive rotting as shown in inoculationexperiments, Likewise, these major storage pathogens were carried as latent infections in healthy-looking seed potatoes, Incidence of major storage pathogens was generally higher during the wet season than the dry season, Commonly associated fungi which did not cause rotting when inoculated alone in intact tubers included Aspergillus Spe, and Penicillium sp. Streptomyces scabies, although frequently observed, was not considered a storage pathogen since it affects only the skin, In the control of storage rots in 5«month long in-ground storage (IGS) by drenching fungicides on the tubers at maturity. fungicide, application did not significantly control l'. solani P, solanacearum and disease complex of F. solani + Rs solani. Longer IGS increased the incidence of the major storage pathogens as well as losses in yield, The study on the chemical control of F. solani, R. solani and joint infections by F. solani +R. solani was more effectively controlled than R. solani and that joint infection by the two was significantly lower than their separate infections. Fungicides applied as protectant dip were most effective followed by eradicative dip, protective and eradicative sprays. Protective and eradicative sprays did not differ from each other, As protectant dip, benomyl effectively controlled F. solani and joint infections by F, solani +R. solani, while thiophanate methyl effectively controlled RK. solani, Frungicide application did not affect increasal yields of extra-large and small tubers but effected increased yield of large, medium and total marketable tubers, Treatment with mancozeb and treatments with thiophanate methyl and chlorothalonil most significantly enhanced increased large tuber yield and medima tuber yield, respectively. Mancozeb + cymoxanil, benomyl and mancozeb affected increased total marketable tubers most significantly. The use of fungicides to control rotting by F. solani. encountered during the breaking of dormancy with calcium carpide showed promising results, Benomyl effectively controlled By solani during the incubation period for breaking dormancy to one month exposure of sprouted tubers and even latent infection as manifested by the control up to harvest when these tubers were planted, Chlorothalonil, PCNB and thiophanate methyl likewise provided adequate protection, There was no inhibition of germination in addition to increased yield.
Star ratings
    Average rating: 0.0 (0 votes)

Thesis (Ph.D.--Plant Pathology) University of the Philippines, College Laguna

Includes bibliographical references.

LUIS, JANET.S, University of the Philippines at Los Banos, November 1987, Identification and Control of Major Seed Potato Storage Diseases in Benguet and Mountain Province, philippines,

In a four-year survey (19831986) undertaken to identify major seed potato storage pathogens in Benguet and Mountain Province, Fusarium sambunicum, E, solani, Rhizoctonia solani, Pseudomonas solanacearum (biovars I and II) and disease complex of F. solani +R, solani and occasionally F, solani with Streptomyces scabies were encountered and isolated from diseased tubers, Except F, sambunicum, all pathogens were consistently present in all survey sites throughout the survey seasons, F, solani was more virulent than F, sambunicum, All pathogens were capable of causing extensive rotting as shown in inoculationexperiments, Likewise, these major storage pathogens were carried as latent infections in healthy-looking seed potatoes, Incidence of major storage pathogens was generally higher during the wet season than the dry season,

Commonly associated fungi which did not cause rotting when inoculated alone in intact tubers included Aspergillus Spe, and Penicillium sp. Streptomyces scabies, although frequently observed, was not considered a storage pathogen since it affects only the skin,

In the control of storage rots in 5«month long in-ground storage (IGS) by drenching fungicides on the tubers at maturity. fungicide, application did not significantly control l'. solani P, solanacearum and disease complex of F. solani + Rs solani.

Longer IGS increased the incidence of the major storage pathogens as well as losses in yield,

The study on the chemical control of F. solani, R. solani and joint infections by F. solani +R. solani was more effectively controlled than R. solani and that joint infection by the two was significantly lower than their separate infections.

Fungicides applied as protectant dip were most effective followed by eradicative dip, protective and eradicative sprays. Protective and eradicative sprays did not differ from each other, As protectant dip, benomyl effectively controlled F. solani and joint infections by F, solani +R. solani, while thiophanate methyl effectively controlled RK. solani, Frungicide application did not affect increasal yields of extra-large and small tubers but effected increased yield of large, medium and total marketable tubers, Treatment with mancozeb and treatments with thiophanate methyl and chlorothalonil
most significantly enhanced increased large tuber yield and medima tuber yield, respectively. Mancozeb + cymoxanil, benomyl and mancozeb affected increased total marketable tubers most significantly.

The use of fungicides to control rotting by F. solani. encountered during the breaking of dormancy with calcium carpide showed promising results, Benomyl effectively controlled By solani during the incubation period for breaking dormancy to one month exposure of sprouted tubers and even latent infection as manifested by the control up to harvest when these tubers were planted, Chlorothalonil, PCNB and thiophanate methyl likewise provided adequate protection, There was no inhibition of
germination in addition to increased yield.

Submitted to the University Library 05/04/2007 T-1470

Copyright © 2024. Cavite State University | Koha 23.05