Evaluation of Some New Cotton Genotypes Against Verticillum Disease (Verticillum dahliae Kleb.)

Abstract

This study was carried out to determine the responses of some new cotton (Gossypium hirsutum L.) lines to Verticillium wilt disease (disease agent is Verticillum dahliae Kleb.) and to enable the use of disease resistant or tolerant lines in future studies. The field trials were conducted at the trial field, Dicle University, Diyarbakir, Turkey in 2019. The trial field was a naturally contaminated with disease agent V. dahliae. Nine new advanced lines of cotton were used as material. Verticillium wilt resistant/tolerant cotton cultivars DP-396, BA-119 and STV-468 were used as control cultivars. Disease index and disease incidence (%) were examined in the study. The experiment was set up in a randomized block design with four replications. According to the variance analysis, significant results were obtained in terms of disease index and the rate of infection (%). Based on disease index values, the STV-468 standard genotype and Hat-1, Hat-2, Hat-3, Hat-4, Hat-5 and Hat-9 candidate lines were the most disease tolerant genotypes. In terms of disease incidence (%), the STV-468 and DP-396 standard genotypes and Hat-1, Hat-2, Hat-5, Hat-7 and Hat-9 advanced lines were determined as the most tolerant genotypes. It was concluded that the cotton genotypes STV-468, Hat-1, Hat-2, Hat-5 and Hat-9 can be used in V. dahliae infected cotton cultivation areas.