Micronutrient contents in healthy and Crinipellis perniciosa infected tissues of Theobroma grandiflorum.

Micronutrient contents in leaf and branch tissues of cupuassu plants (Theobroma grand iflorum) infected by Crinipellis perniciosa, the causal agent of witches' broom disease, were determined to support further studies on the effect of nutritional status in the disease progress. Lower contents of boron and manganese and higher content of copper were found in infected leaf tissues. There was not any statistical difference in the copper content of branch tissues, even though higher copper content was found in healthy branches than in healthy leaf tissues. No changes in contents of iron and zinc in healthy of infected tissues were detected.

2002