What is the fine-grained topic of the following text: Studies were conducted to determine the reaction of some banana clones, derived from in vitro plantlets, to yellow Sigatoka caused by Mycosphaerella musicola: Titiaro (‘Pisang mas’ AA), Pineo Gigante and Brasilero (Subgroup Cavendish AAA), and Tetraploid (FAGRO-7.AAAA) were tested. Only return the topic.
Reaction of banana clones to yellow Sigatoka disease