Simultaneous control of annual grasses and broad-leaved weeds in cereals: grasskillers in winter-cereals: pre-em. treatments

Stryckers, J.; Himme, M. van; Bulcke, R.

Stryckers, J; Himme, M van; Bulcke, R Review of results obtained for the cropping period 1976-1977-1978 by the Centrum voor Onkruidonderzoek Bespreking van de resultaten bereikt door het Centrum voor Onkruidonderzoek tijdens de proefperiode 1976-1977-1978: 10-20


Accession: 000747039

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Many autumn herbicide treatments were tested for control of Alopecurus myosuroides and associated broad-leaved weeds (chiefly Matricaria recutita and Stellaria media); large numbers of tillering A. myosuroides plants appeared in March following the mild winters of 1976-77 and 1977-78. In the dry October of 1976, on a sandy loam soil methabenzthiazuron at 2.25 kg/ha was more effective than neburon at 2.5 to 2.75 kg/ha in controlling blackgrass but the most effective treatments were neburon at 1.8 kg/ha + either dinitramine at 0.5 kg/ha or N-propargyl-2-chloro-2'-methyl-6'-ethylacetanilide at 0.75 kg/ha. In the wet conditions of 1978 all mixtures containing neburon and linuron performed outstandingly well, although linuron alone at 0.6 kg/ha was less good. Control with butralin alone at 3 kg/ha was better than with butralin + neburon (1.2 kg + 1.8 kg/ha) or butralin + linuron (1.6 kg + 0.4 kg/ha); trifluralin at 0.9 kg/ha was more effective in a mixture with neburon at 1.8 kg/ha than with linuron at 0.45 kg/ha. Slight but not significant yield depressions in wheat were caused by neburon alone and in mixtures with butralin and dinitramine in 1976; in 1978 it was the linuron treatments that depressed wheat yields, but no treatments reduced barley yields in either season. Chlortoluron at 1.5 to 1.6 kg/ha was more effective than chlortoluron at 0.75 to 0.8 kg + pendimethalin at 0.375 to 0.5 kg/ha in controlling A. myosuroides and Poa annua. Bentazone at 1.2 kg/ha in February, followed in April by bentazone + mecoprop K, each at 1.5 kg/ha, halved the grass infestation and completely controlled broad-leaved weeds. On heavy clay soils, under maritime conditions, chlortoluron at 1.25 kg/ha + pendimethalin at 0.75 kg/ha (in 1976-77) and neburon at 3 kg/ha + isoproturon at 1.75 kg/ha (in 1977-78), applied 10 days after sowing winter wheat, were most effective against A. myosuroides and also controlled M. recutita and S. media. Under the very wet conditions neburon + isoproturon caused temporary injury to the crop. In a trial to compare various herbicide formulations, cycloate granules at 1.25 kg/ha were less effective than the e.c. formulation at 2 kg/ha but granules at 2.5 kg/ha controlled weeds better than the e.c. at 4 kg/ha.