I would like some help in identifying some ways in which the following passage could be flawed: both if it were to be modified and also as it is currently. In other words, what would I have to modify in order to make the passage flawed, if it is not already? Some necessary assumptions for the following passage would also be much appreciated.
"In the past 1,000 experiments, whenever an experimental fungicide was applied to coffee plants infected with coffee rust, the infection disappeared. The coffee rust never disappeared before the fungicide was applied. Therefore, in these experiments, application of the fungicide caused the disappearance of coffee rust."
Thank you