Antibiose e antixenose à mosca-minadora Liriomyza sativae (Diptera: Agromyzidae) em germoplasma de meloeiro

Abstract

The melon (Cucumis melo) is a vegetable of great socioeconomic relevance worldwide, is produced in all the continents, but it is faced with several phytosanitary barriers, among them, the leafminer, Liriomyza sativae (Diptera: Agromyzidae), which is considered the key-pest of the crop. Among the several techniques that aim to control the leafminer, the use of resistant cultivars deserves attention because it allows association with other methods of control, does not pollute and does not harm the farmer and the consumer. In this context, the objective of this study was to select sources of resistance to leafminer in melon germplasm. For this, laboratory experiments were conducted to analyze antibiosis and antixenosis resistance, with and without a choice, in 32 melon genotypes. The genotypes showed genetic variability. In the experiment testing the antibiosis, the 'Festival' genotype was considered the most promising because it allowed larval viability of only 5.2%. In addition, one of the access plants 'CNPH 09-919' presented larval viability of 13.3%, indicating a probable source of fly-leaf resistance. In the evaluation of antixenosis, it was possible to select promising genotypes in the assay with choice, but in the non-choice it was verified that no genotype was superior to the 'BGMEL 56R' control. The variable "number of mines per area" was the one indicated to assess the antixenosis in the genotypes.