Pérez Arocho, Jorge E.

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    Resistencia a la oruga del melón (Diaphania hyalinata L.) en Cucurbita moschata Duchesne y en especies relacionadas
    (2011) Pérez Arocho, Jorge E.; Wessel Beaver, Linda; College of Agricultural Sciences; Cianzio, Silvia R.; Armstrong Ramírez, Arístides M.; O’Farrill Nieves, Hipólito; Department of Crops and Agro-Environmental Sciences; Acosta Martínez, Jaime A.
    The melon worm, Diaphania hyalinata L. is the most important pest of pumpkin (Cucurbita moschata) and other cucurbits in tropical countries. The larvae of this insect feed mostly on leaves, causing losses of up to 100%. Genetic resistance would be an economical and environmentally favorable way to control the damage inflicted by Diaphania hyalinata on this crop. The objective of this research was to study resistance to D. hyalinata in 345 accessions of Curcubita moschata Duchesne and 65 accessions of C. argyrosperma Huber from the collection of the USDA National Plant Genetic Resources System, and from the collection of the plant breeding program of the Agricultural Experimental Station from the University of Puerto Rico. The accessions where evaluated for resistance to the melon worm in the field under conditions of natural infestation. While no accessions were completely resistant to melonworm, the study identified a group of accessions with above average resistance. Susceptibility to D. hyalinata was greater in C. argyrosperma, although melonworm was often found above critical levels in C. moschata. Resistance to D. hyalinata found in certain green leaf (non-mottled) glabrous accessions of C. argyrosperma and C. moschata is the antixenosis type. Most resistance to melon worm was found in accessions from the Americas.