1. Subsection 2 of section 229.475 shall not apply to the control or eradication of diseased vegetation or noxious weeds by authorized personnel.

2. Provided that such plants or plant parts are not offered for sale, subsection 2 of section 229.475 shall not apply to the collection of seeds, fruits, nuts, berries, edible wild greens or flowering parts of plants, or the occasional collection of plants for the purposes of scientific research or education.