Green shoots from the second wave of cereal drilling are starting to appear and growers are back in charge of the autumn workload.Slug activity continues and growers should monitor fields carefully, particularly where seed-beds are cloddy or were too wet to roll.
Later drilled, slower emerging crops are particularly vulnerable and growers should also look out for leaf shredding on earlier drilled wheats after rapeseed.All established and late October/early November emerging cereals should be protected from aphid vectors of BYDV infection, either by seed treatment or a foliar spray to prevent build up of any colonies that may already have established in these crops.
If conditions remain mild, then early September-sown crops treated with Redigo Deter (clothianidin + prothioconazole), now eight weeks post-emergence, should receive a foliar application of cypermethrin to continue protection until the aphid migration ceases.Blackgrass is emerging in more forward wheats with some plants at the two-leaf stage or beyond. An autumn application of Atlantis (mesosulfuron + iodosulfuron) should be considered where blackgrass and sterile brome are the target weeds, particularly where blackgrass populations are more difficult to control due to high numbers or more resistance types.
Applications should be made at the one to three leaf stage of the weeds whilst they are actively growing. Avoid spraying later in the day when damp conditions may prevent the spray drying on the leaf. Phoma infection is easily observed in most rapeseeds. Small crops are most vulnerable and all untreated crops should be treated soon.
The time for Kerb (propyzamide) and Crawler (carbetamide) applications on rapeseed is approaching. However, sprays should be held back until soil temperatures dip to 10C or below. This is particularly important where blackgrass populations are high. Moist soil conditions and recent frosts will also help improve the efficacy of these actives.