Photodecomposition experiment were carried out in 18 days. It demonstrated polyketone was photodegradable by UV-irradiation, as far as molecular weight was concerned, its UV-photodecomposition half-time was 5days and it dropped from 26352 to 7892 in 18 days.
Based on a series of field experiments a set of application criteria in terms of potato plant were recommended for 50% fentin hydroxide SC. Photodecomposition is one of the important degradation pathways of pesticides occurring in the potato environment.