Simazine and Paraquat are no longer available. They used to be used at 1.0 to 1.5 litres per hectare plus Paraquat at 0.33 to 0.5 litres per hectare applied as the crop was starting to emerge (i.e. before 10% emergence).
Nirvana is now the standard treatment. Apply at 4.0 lts/ha immediately after sowing. It should not be used once seeds have started to sprout or post emergence. A soil cover of at least 25mm over the seeds is important when using Nirvana.
Graminisides like Stratos Ultra; Fusilade etc. will deal effectively with Scutch, Wild Oats and other grasses.
The three important diseases of the Faba Bean crop, namely Chocolate Spot, Ascochyta Leaf and Pod Spot, and Downy Mildew are all diseases of cool, wet, humid conditions, hence the importance of reasonable air circulation within the growing crop.
Healthy seed and good rotation are important.
Chemical disease control is based on a preventative strategy.
Chlorothalonil is applied at 2Lt/ha before disease starts to build up; the crop will be about 2ft high at this stage.
Amistar has also been used successfully & if doing so, it should be included early at 0.5 to 0.66lt/ha.
If Downy mildew is becoming a threat, use products containing methalaxyl e.g. Folio Gol
Birds are the major threat to beans for the first few weeks after sowing.
Good field hygiene, proper sowing depth & early vigilance is vital.
Black Bean aphids appear in crops every season, particularly near headlands. Spraying is seldom necessary.
Adult Bean Weevil feed on the young leaves in spring producing the characteristic U-shaped notching. However it is the grubs of this pest feeding on the root nodules that cause significant yield reduction. Spray timing is difficult, but to be effective, must be applied before adults lay their eggs in the soil at the base of the plants.
Stem Nematode (Eelworm); It is vital that all seed is certified free of Stem Nematode