Hello. Unfortunately you did not show the letter written by Rodrigues, which makes it impossible for the supporting details about the disadvantages of controlled fires to be presented. However, I will try to help you as best I can.
First, you need to know that a supporting detail is one (or more than one) sentence that proves that an argument is correct. This proof can be done with sentences that present data, examples, or that show, in some way, that the argument presented by the author of the text, must be considered correct and must be taken seriously. In the case of Rodrigues' letter, you already know that the argument is about the disadvantages of controlled fires. To find the supporting details for this argument, you should read the text and identify the sentences Rodrigues uses to show that, in fact, there are disadvantages to using controlled fires. In this case, you need to identify sentences that show how these disadvantages are presented and what the author's data are to prove it.
Now let's know what a controlled fire is and what possible disadvantages you can find in Rodrigues' letter.
Controlled fire is a fire caused intentionally by forest guards, or professionals in this field. This fire is caused with beneficial purposes, as it can combat harmful forest fires, reduce the incidence of severe forest fires, reduce the accumulation of fuel in the forest and stimulate the germination of seeds in the forest soil and reveal soil layers with high concentration of minerals. In this way, we can see that controlled fire is a form of forest management and forest renewal, however, the disadvantages of this practice cannot be ignored.
The main disadvantage is the possibility of loss of control. This is because even though it is managed by professionals, the forest is a place that provides a quick spread of fire. This can cause professionals to lose control of the controlled fire and end up causing a high proportion fire. In this case, the effect of the controlled fire would be highly harmful, as it would cause the loss of biological diversity and the rampant killing of local fauna and flora. Furthermore, fire could cause respiratory problems in urban communities close to the forest and could even put people's safety at risk.
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