Download e-book for iPad: Herbicide Resistance in Weeds and Crops by J. C. Caseley

By J. C. Caseley

In line with the court cases of the eleventh lengthy Ashton overseas Symposium, held in September 1989, this e-book considers either the agronomic, physiological and biochemical elements of herbicide resistance in weeds and the development made up to now within the improvement of herbicide resistant crop vegetation. subject matters contain the occurrence, distribution and agronomic significance of herbicide resistant weeds, dynamics of herbicide resistance, the move of herbicide resistance features to plants and the results for destiny regulate recommendations

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Consequently, A. , 1979). 45 The herbicides, chlorotoluron and isoproturon, were introduced into the UK in the early 1970s, mainly for the control of this weed. These two herbicides were used on about 50% of the winter cereal area in England and Wales in 1982 (Sly, 1984). Many fields have had successive, annual applications for many years. Currently, isoproturon is the most widely used herbicide for control of this weed in England. Alopecurus myosuroides, as a weed of cereals, has many of the characteristics listed by Harper (1956) which would favour the development of herbicide resistance: high reproductive capacity, absence of a large, dormant seed bank to buffer population changes, association with cereal monoculture and intensive use of a single herbicide type.

R. (1980). , in modern cereal growing systems. ADAS Quarterly Review 38, 170-191. R. (1984). The influence of cultural practices on the activity of soil-acting herbicides. British Crop Protection Council Monograph No. 27, Symposium on Soils and Crop Protection Chemicals 77-86. R. (1985). The effect of cultivation systems and soil factors on the performance of herbicides against Alopecurus myosuroides. Annals of Applied Biology 107, 253-262. R. (1987). Herbicide resistance in black-grass (Alopecurus myosuroides).

A similar type of multi-herbicide resistance occurs in Australia with diclofop-methyl-resistant Lolium rigidum Gaud. (Heap, these Proceedings). The degree of resistance varies between herbicides but is not related directly to chemical grouping or mode of action. Although resistance is not absolute, experiments in simulated field conditions show that substantial reductions in herbicide activity can occur at recommended field rates (Moss, 1987; Moss and Cussans, 1987). , 1990; Kemp and Caseley, these Proceedings).

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