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Carica papaya is one of the most economically important fruit crops in the Philippines. Its production has been affected by a disease caused by Papaya ringspot virus (PRSV) and the development of new hybrid varieties is one approach to circumvent this problem. Three new F1 hybrids that are moderately tolerant to PRSV were developed by the Papaya Breeding team of the Institute of Plant Breeding, College of Agriculture and Food Science, University of the Philippines Los Baños. The parents of the hybrids were PRSV-tolerant. They also possess desirable characteristics. These new F1 hybrids were tested in a few locations in Southern Tagalog. In addition to moderate reaction to PRSV, ‘Hirang’ (Hybrid 097 x 4172), ‘Liyag’ (Hybrid 5648 x 336), and ‘Timyas’ (Hybrid 4173 x 5648) are prolific bearers of fruits which are sweet and firm, and have juicy flesh. ‘Hirang’ has red-orange flesh while ‘Liyag’ and ‘Timyas’ have yellow to yellow orange flesh. The trees are semi-dwarf and have a thick stem.

{Photographs courtesy of the Office of Public Relations - UPLB}

Philippine Agricultural Scientist (ISSN 0031-7454)

An international journal of tropical agriculture and related sciences, is published quarterly by the College of Agriculture and Food Science, University of the Philippines Los Baños, 4031 College, Laguna, Philippines.


"Oblation" the concrete statue that symbolizes the University of the Philippines; Created by the National Artist Guillermo Tolentino

Information for Contributors

Contributors are welcome to submit a technical paper for publication in any issue of this journal on a subject of their expertise and experience in research and development in the broad field of agriculture.



The journal follows the guidelines of Scientific Style and Format: The CSE Manual for Authors, Editors and Publishers (2006), 7th ed., Council of Science Editors and the Rockefeller University Press.


Ten offprints of the journal will be supplied free of charge. Offprints in lots of 10 and copies of the issue can be ordered.


Use SI units in accordance with the recommendations of the International Organization for Standardization (ISO) specified in the British Standards Institution


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Issues Categories

Articles maybe papers and notes on original fundamental or applied research and, to a limited extent, critical research reviews, professional chair lectures or book reviews on the following:

Tropical Agricultural Science

Environmental Science

Food Science