Factors Influencing the Phytotoxicity and Movement of Paraquat in Quackgrass

Weed Science - Tập 16 Số 1 - Trang 80-83 - 1968
A. R. Putnam1, S. K. Ries1
1Department of Horticulture, Michigan State University, East Lansing, Michigan

Tóm tắt

Quackgrass (Agropyron repens (L.) Beauv.) was defoliated for 25 to 30 days with applications of 1.0 lb/A of l,l′-dimethyl-4–4′-bipyridinium salt (paraquat). Applications were more effective made prior to darkness than at midday. Phytotoxicity was increased by adding surfactants in the field, and experiments utilizing 14C-paraquat under controlled environmental conditions indicated that the surfactant X-77 increased foliar absorption by 20%. Quackgrass plants grown in nutrient solutions exhibited chronic paraquat toxicity which increased as the nitrogen levels increased. Paraquat also inhibited the growth of lateral buds on quackgrass rhizome segments cultured in the dark. Greater movement of 14C-paraquat in quackgrass leaves occurred under 6 hr of light as compared to 6 hr of darkness following application. However, a 6-hr dark period after application prior to the light period further enhanced the movement from the treated leaf.

Từ khóa


Tài liệu tham khảo

Ries, 1956, The effect of fertilizer applications on quackgrass control with dalapon treatments before planting vegetables, Proc. NCWCC, 13, 60

10.1111/j.1365-3180.1966.tb00895.x

10.1104/pp.40.5.832

Calderbank, 1964, Mode of action of the bipyridylium herbicides diquat and paraquat, Proc. BWCC, 7, 312

Boon W. R. 1964. The chemistry and mode of action of the bipyridylium herbicides diquat and paraquat. Outl. Agr. 163–170.

10.1111/j.1365-3180.1966.tb00891.x

10.1111/j.1365-3180.1965.tb00318.x

10.1111/j.1365-3180.1967.tb01370.x

10.1111/j.1365-3180.1964.tb00309.x

10.2307/4041158

10.1038/198872a0

10.2307/4040945

Thông tin
Thông tin xuất bản

Weed Science

Tập 16 Số 1

80-83

Thông tin tác giả