CONTENTS

Callus induction and plant regeneration of two Cuban rice cultivars using different seed explants and amino acid supplements

Maylin Perez-Bernal , Magalis Delgado Rigo, Carlos Alberto Hernandez Diaz, Maria Teresa Barcelo Avila and Raul Armas Ramos

Sweetpotato weevil pheromones and their precursors: Dose-response and structure-activity relationship in Cylas formicarius Fabr., Cylas brunneus Olivier and Cylas puncticollis Boheman

Erlinda A. Vasquez, Dietmar Schmidt, Claus Peter Zebitz, Uwe Beifuss, Iris Klaiber, Jurgen Kroschel, and Remberto Patindol

Impacts of the Techno Gabay Program in Eastern Visayas, Philippines as revealed by stakeholders’ stories of significant change

Editha G. Cagasan and Ma. Theresa H. Velasco

A review of soil degradation in the Philippines

Victor B. Asio , Reinhold Jahn, Federico O. Perez , Ian A. Navarrete and Sergio M. Abit Jr.

Improvement of the growth, yield, and tuber quality of purple yam through macro and micronutrient fertilization

Anabella B. Tulin

Conditions leading to addiction and avoidance of massively multiplayer online role playing games (MMORPGs) among game addicts

Neil Anthony C. Rusia and Rotacio S. Gravoso