Severity of rust (Olivea tectonae) in different clones of teak in northern Mato Grosso

Abstract

The fungus Olivea tectonae , has been increasing attention from different countries of course have teak or commercial plantations with the species, as it causes severe defoliation of plants, contributing to the reduction of production. The objective was to monitor different teak clones, with five months in Sinop / MT, with respect to the fungus O. tectonae , causal agent of rust. The study of disease progress was made between the months of May 2009 to July 2010, evaluating the severity visually in three regions of the plant: upper, middle and lower. We analyzed ten different clones C1, C2, C3, C4, C5, C6, C7, C8, C9, C10 and, after completion of data collection built up the area under the disease progress curve (AUDPC). The results showed that clone C7 was most likely at the top (AAPCD 35,45) and clone C1 was the most resistant (AACPD 22,37). The C9, C8 and C10 clones are statistically equal, more likely in the middle region (AAPCD 6.332,02; 5.873,34; 5.759,75, respectively) and C5 more resistant clone in this region (AACPD 1.872,70). In the lower region the clone C5 was the toughest (AACPD 5.691,06) and the C9 clone was the most likely (AACPD 15.746,73). In the analysis of the entire plant, the clone C5 was tougher (AACPD 27.603.889,00) and C9 clones C8 and C10 were statistically equal, proving to be the most susceptible to rust (AACPD 78.872.378,00; 68.335.115,00 e 65.686.893,00 respectively).