Author/Authors :
Martins, Inara A. Departamento de Agricultura - Universidade Federal de Lavras, Lavras, MG, Brasil , Silveira, Erika C. Departamento de Agricultura - Universidade Federal de Lavras, Lavras, MG, Brasil , Souza, Douglas C. Departamento de Agricultura - Universidade Federal de Lavras, Lavras, MG, Brasil , Bernardi, Leopoldo F.O. Departamento de Entomologia - Universidade Federal de Lavras, Lavras, MG, Brasil , Souza, Bruno H.S. Departamento de Entomologia - Universidade Federal de Lavras, Lavras, MG, Brasil , Resende, Luciane V. Departamento de Agricultura - Universidade Federal de Lavras, Lavras, MG, Brasil
Abstract :
Cultivating resistant genotypes can be an efficient method for keeping mite populations below levels that cause
economic damage in crop plants because it is inexpensive and can be integrated with other pest control tactics. The
present work evaluated the resistance of nine experimental strawberry genotypes (MCA89, MFA444, MCA93–01,
MFA443–01, MFA451, MCA111, MOGSC468, MFA443, and MDA22) to the two-spotted spider mite Tetranychus
urticae Koch compared to two commercial cultivars (Camarosa and Dover). Laboratory oviposition assays were
performed using excised leaf discs. Although significant differences were observed in mite's oviposition, none of the
strawberry genotypes stood out for high resistance levels. The lowest oviposition averages were found in the
genotype MDA22 (abaxial 17.13 ± 4.20 and adaxial 30.63 ± 6.80), resulting from a cross between cv. Dover and cv.
Aromas, genotypes considered to have intermediate resistance to T. urticae. In addition, MDA22, provided neutral
stimulus for mite's oviposition on the abaxial and adaxial surfaces. Given the results, MDA22 genotype should be
used as a parent for new crossings in breeding programs that aim to increase the genetic basis of genotypes adapted
to Brazilian edaphoclimatic conditions and resistant to T. urticae.
Keywords :
Fragaria ananassa , genetic breeding , horticulture , plant selection , resistance
