Linares-Ramรญrez, Angela M.
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Publication Response to phenotypic recurrent selection for resistance to ๐๐ช๐ข๐ฑ๐ฉ๐ข๐ฏ๐ช๐ข ๐ฉ๐บ๐ข๐ญ๐ช๐ฏ๐ข๐ต๐ข (L.) (Lepidoptera: Pyralidae) in tropical pumpkin (๐๐ถ๐ค๐ถ๐ณ๐ฃ๐ช๐ต๐ข ๐ฎ๐ฐ๐ด๐ค๐ฉ๐ข๐ต๐ข Duchesne)(2008) Linares-Ramรญrez, Angela M.; Wessel-Beaver, Linda; College of Agricultural Sciences; Ortiz, Carlos E.; Segarra-Carmona, Alejandro E.; Department of Agro-Environmental Sciences; Ferwerda, FeikoIn order to determine the effectiveness of phenotypic recurrent selection for resistance to melonworm, two cycles of selection were carried out on ๐๐ถ๐ค๐ถ๐ณ๐ฃ๐ช๐ต๐ข ๐ฎ๐ฐ๐ด๐ค๐ฉ๐ข๐ต๐ข โTaรญna Doradaโ. Selection was based on results of a laboratory detached leaf test followed by a field evaluation. Three experiments were then conducted in two locations, Lajas and Isabela, during July to November 2007 to compare the base population (โTaรญna Doradaโ [TD] Cycle 0) and the two cycles of selection (TD-Cycle 1 and TD-Cycle 2). In addition, the experiments included two commercial genotypes (โSolerโ and โVerde Luzโ) and two experimental genotypes (โNigerian Localโ and PR-MWR1). The materials were evaluated for foliar damage, number of eggs and larvae, and yield. The effect of phenotypic recurrent selection for resistance was not as great as anticipated at the start of this research. A slight reduction was observed in numbers of eggs and larvae after two cycles of selection. Two cycles of selection for resistance had no effect on yield and average fruit weight. High variances were observed for number of eggs and larvae. As a consequence, for future cycles of selection more replications (plots) and/or samples (number of leaves per plant) are necessary to find differences between genotypes and carry out effective selection. Some modifications of selection procedures may be needed to decrease sampling and experimental errors.