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Cardona Mejía, César ,  [Whiteflies as pests of annual crops in the tropical highlands of Latin America. Introduction] ,  Whiteflies as pests of annual crops in the tropical highlands of Latin America. Introduction

Cardona Mejía, César ,  López Avila, A. ,  Valarezo, O ,  [Whiteflies as pests of annual crops in the tropical highlands of Latin America. Colombia and Ecuador] ,  Whiteflies as pests of annual crops in the tropical highlands of Latin America. Colombia and Ecuador