บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Cut flower disinfestation: Assessment of replacement fumigants for methyl bromide

G. L. Weller and J. E. van S. Graver

Postharvest Biology and Technology. Volume 14, Issue 3, 9 November 1998, Pages 325-333.

1998

บทคัดย่อ

Cut flower disinfestation: Assessment of replacement fumigants for methyl bromide

Phytotoxic effects of a number of gases were assessed as alternatives to methyl bromide for insect control on cut flowers. Phosphine was found to be the least phytotoxic, methyl bromide, carbonyl sulphide and hydrogen cyanide produced similar phytotoxic effects, and ethyl formate was considered unsuitable. Increased dosages of phosphine were tested for phytotoxicity against Protea `Pink Ice'. Damage was observed in dosages above 1 g m-3 for 5 h although levels observed for 1 g m-3 for 15 h were still within marketable limits. At the highest dose, phosphine did not kill all life stages of psocids (Liposcelis bostrichophila), non-diapausing two spotted mite (Tetranychus urticae), cotton whitefly Type B (Bemisia tabaci) and rice weevils (Sitophilus oryzae) and ants (Iridomyrex purpureus). Therefore, phosphine does not provide adequate control as a single treatment for cut flowers. If phosphine is to be used for fumigation of cut flowers, it should be combined with other treatments to achieve complete kill. Given that combined treatments are necessary, there is little if any advantage in extending fumigation times from 5 to 15 h.