Field beans weeds

Chemical Name 3-(4-chlorophenyl)-l-methoxy-l-methylurea Af,-(4-chlorophenyl)-Ar-methoxy-Ar-methylurea Uses herbicide for pre- or post-emergence control of annual broadleaf weeds and annual grasses in asparagus, berry fruit, cereals, maize, field beans, vines, leeks, onions, potatoes, herbs, lucerne, flowers, ornamental shrubs and trees, etc. 

Table 14.2 General table of weed susceptibility to some commonly used herbicides in oilseed rape, combinable peas and field beans... 

A sound rotation with good weed control in the previous crops particularly of grass weeds and pereimial broad-leaved weeds will reduce the need and cost of weed control in field beans. 

If beans could be affected by trifluralin as described then it seems reasonable to assume that similar physiological and morphological injuries can occur in weeds making them more susceptible to mycoherbicides such as that described by Yu et ai. (31). In fact, concentrations as low as 10% of recommended field rates could have affected hypocotyls and foliage of treated plants, including both host plants and weeds. 

Arle, Leonard, and Harris80 reported the use of activated carbon to protect sensitive field crops against injury from a weed killer— 2,4-D (2,4-dichlorophenoxyacetic acid). In one of several experiments, a field was sprayed with 2,4-D—1.3 pounds free acid equivalent per acre. One-half of the plot was planted with sweet-potato sprouts that had been previously moistened and then dusted with activated carbon the other half of the plot was planted with untreated sprouts. In the case of the untreated sprouts, only 2.5% survived whereas 95.0 % of the sprouts treated with activated carbon survived and produced plants that were normal in every respect. Weaver81 found that the toxic effect of 2,4-D on soybean, red kidney bean, white mustard, or marigold were eliminated or decreased by dusting or spraying activated carbon in aqueous suspension on the plants before the 2,4-D treatment. 

The second field trial tested the ability of bark extract to control weeds under field conditions with horticultural crops (bush bean, cauliflower, sweet corn, and tomato). 

Winter beans These are often broadcast onto stubble and ploughed in. The surface is then levelled to make travel across the field more comfortable and to kill ary weeds which have emerged. 

Plant population. Winter beans require an established plant population of 18-20 plants/m post-winter and the chosen seed rate should allow for 20-25% field loss. For spring beans the requited population is about 40 plants/m with a field loss of 0-5%. Dense populations tend to increase disease problems whereas thin crops are less competitive to weeds. In some areas rooks may reduce plant populations. 

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