Avaliação da repelência de tomateiros ao ácaro rajado

Abstract

The tomato crop is negatively affected by pests such as mite Tetranychus urticae (Koch)(Acari: Tetranychidae). This workaims to characterizethe degree ofrepellencyof tomato genotypes to T. urticae. The research was carried out at the Federal University of Lavras-UFLA at 23±2 °C, from May to November 2001, in four tests with 19 treatments (T) and 3 replicates (r): 6 T and 3 r, 19 T and 3 r, and 16 T and 5 r. The T (genotypes) were two susceptible controls, Solanum lycopersicum IPA-5 and S. lycopersicum Caline IPA-6; two resistant controls, Lycopersicon hirsutum f. glabratum and L. hirsutum f. glabratum (PI 134417); progenies of S. lycopersicum x Lycopersicon hirsutum f. glabratum : 184.1.1m2; 199.2.2m2; 206.1.2m2; 213.1m3; 213.4m3; 215.4.1m2; 217.1.1m2; 217.1.2m2; 217.1.3m2; 217.2.1m2; 219.1.3m2; 224.1.1m2; 224.3.2m2; 226.3m3 and 229.2.2.m2. The square root was one tomato leaflet from the third leave of the apical region of the plant. Data were analyzed by ANOVA and Duncan test at 5%. The cultivar IPA-5 showed low repellency; the progenies 206.1.2m2, 213.4m3 and 217.2.1m2 showed low to medium repellency; the cultivar Caline IPA-6 and the progenie 229.2.2m2 showed medium repellency and the genotypes L. hirsutum f. glabratum and L. hirsutum f. glabratum PI 134417 showed high repellency to T. urticae females. The measurement of the repellency of the tomato genotypes to the mite by the Weston and Snyder test was satisfactory.