ABSTRACT
Injuries caused by broad mite to the main cotton cultivar and advanced lineages available presently in Brazil were evaluated in three field experiments. In a randomized block design with 6 replications, the plots consisting of a 5-m-long row, the trials were carried out in the 2001/2002 and 2005/2006 season at Campinas, SP, and in 2003/ 2004 at Guaíra, SP, Brazil. A total of 36 different genotypes were used. Sixteen treatments were carried out in 2001/2002 and 2003/2004, and 18 in 2005/2006. Evaluation was performed by attribution of scores from 1 to 5 to the entire plots, according to the level of injury caused to plant leaves. In all the experiments, wide and gradual differences among genotypes were observed, with mean scores varying from 1.77 (IAC 23) to 4.20 (Sure Grow); 1.45 (Coodetec 401) to 4.63 (MG 0110) and 1.86 (FMT 702) to 4.74 (Stoneville 474), respectively in the 2001/2002, 2003/2004 and 2005/2006 trials. Joint analysis involving four cultivars common to the three experiments corroborates the results, indicating IAC 24 and Fibermax 966 as the least affected, and Deltaopal and Makina as the most injured.
KEY WORDS
Gossypium hirsutum
; broad mite; host plant resistance