Resistência de acessos de meloeiro à mosca-minadora Liriomyza spp. (Diptera: Agromyzidae)

Abstract

A mosca-minadora é a principal praga do cultivo do melão no Nordeste brasileiro. Dentro de um programa do manejo integrado de pragas, o uso de resistência genética é um método de fácil adoção, ecológico e que proporciona a redução dos custos com aplicação de defensivos. O objetivo do presente trabalho foi avaliar a resistência de acessos de meloeiro à mosca-minadora. Vinte e dois acessos e três híbridos foram avaliados em casadevegetação e em dois experimentos conduzidos em condições de campo. Em casa de vegetação, os acessos foram avaliados com chance de escolha para as características número de larvas, número de pupários e número de moscas em um delineamento em látice, com cinco repetições. Em condições de campo, os acessos foram avaliados em dois experimentos conduzidos nos anos de 2009 e 2010, no delineamento em blocos completos casualizados, com três repetições. Contabilizou-se o número de minas por folha. Há variabilidade entre os acessos de meloeiro para resistência à mosca-minadora nos acessos avaliados. O acesso AC-22 é o mais promissor como fonte de resistência à mosca- minadora nas avaliações em campo e casa de vegetação, seguido do acesso AC-10. Os demais acessos são suscetíveis.

Determination of damaged leaf area and physiological responses of melon plants submitted to different infestation levels of Liriomyza sativae

“…The melon leaf injury caused by leafminer larvae affects the productivity and the quality of the fruits Guimarães et al, 2009); this fact has motivated researches on, as an example, the evaluation of resistance of melon genotypes to this pest attack (Lima, 2012;Nunes et al, 2013).…”

New sources of resistance to leafminers (Liriomyza sativae) in melon (Cucumis melo L.) germplasm

“…A similar result was obtained in the evaluation of 22 melon accessions in regard to their reactions to Liriomyza spp. because there was also no consistency in their performances in the greenhouse and in the field for two years, except for 'AC-22' (Nunes et al, 2013). Other studies have also reported the selection of only a few melon accessions that are resistant to leafminers, e.g., Kennedy et al (1978) reported that of 50 accessions, only 'PI 282448' and 'PI 313970' exhibited good resistance to L. sativae, and Dogimont et al (1995) found that of 110 accessions, only 'Nantais Oblong' exhibited resistance to L. trifolii.…”

“…It is noteworthy that, among the controls, 'BRS Araguaia' was the only one that had its parent lines and its own performance evaluated for resistance to leafminers in the Jaguaribe-Açu region. Most of the accessions exhibited differing performances, possibly because of the specific conditions in each environment and the type of characteristic evaluated (Nunes et al, 2013 Values in bold indicate the best-evaluated accessions. Table 2.…”

“…Genetic diversity in the germplasm makes it possible for sources that contain favorable alleles to be identified and selected by characterization and evaluation. Nevertheless, few accessions have been characterized or evaluated for the trait of resistance to Liriomyza spp, and few promising sources have been identified (Nunes et al, 2013;Dogimont and Boissot, 2016;Oliveira FIC, Fiege LBC, Celin EF, Innecco R, et al, unpublished results). Therefore, the aim of this study was to identify promising sources of resistance to leafminers in melon germplasm.…”

Host range and genetic strains of leafminer flies (Diptera: Agromyzidae) in eastern Brazil reveal a new divergent clade ofLiriomyza sativae

“…Population outbreaks of leafminer flies have been frequent in Brazil, resulting in a change of importance from secondary to primary pest species of Brassicaceae, Cucurbitaceae, Fabaceae and Solanaceae crop plants (Bettiol et al ., ; Bueno et al ., ; Costa‐Lima et al ., ; Araujo et al ., ; Nunes et al ., ). The most common species reported in Brazil are L. sativae and L. huidobrensis , although other species, including Calycomyza malvae (Burgess), Liriomyza brassicae (Riley), Liriomyza sabaziae Spencer and Liriomyza trifolli (Burgess), have also been reported in the country (Spencer, , ), whereas Liriomyza bryoniae (Kaltenbach) and Liriomyza chinensis (Kato) have not been known from Brazil (MAPA, ).…”