Seleção de genótipos de meloeiro resistente à mosca-minadora Liriomyza sativae Blanchard (Diptera: Agromyzidae)

Abstract

In recent years, the leafminer Liriomyza sativae (Diptera: Agromyzidae) has emerged as one of the main pests of melon crop in Brazil and is present in 100% of the planted area. The development of control techniques that work in harmony with the environment and the host plant resistance is emerging as a promising method that can contribute to this balance in the system, plant - pest - natural enemy. Therefore, this study aimed to: (i) select melon genotypes resistant to leafminer L. sativae in the laboratory; (Ii) define a sheet for sampling L. sativae in muskmelon; and (iii) evaluate the resistance of melon genotypes to the leafminer under field conditions. In test-choice with 27 melon genotypes nine were selected as moderately resistant to L. sativae as oviposition. In addition, two genotypes showed high larval mortality. With these 11 materials were performed preference tests for food and oviposition of L. sativae no choice and their effect on the biology of this pest. It was found that genotypes No23, NO24, NO26 and G76 showed a resistance to the antibiosis type L. sativae, 100% larval mortality in the leaves of these materials. In the field, it determined the optimal sampling sheet to leafminer larvae in melon plants, which varied according to the development of the plant. With this setting the 10 genotypes showed greater resistance to L. sativae in laboratory studies were evaluated in the field. Unlike the results obtained in laboratory conditions, no material presented immunity to attack the leafminer. However, the highlight was the G76 genotype, in which it found high larval mortality, reaching up to 62%. As the genotype 310, which was the least preferred for oviposition, averaging 0.6 to 5.0 per mine.