Planning for booting sprays in barley will need to factor in that not all crops will have reached GS45-55 by the 20th May cut off for chlorothalonil use. The most responsive timing in the winter barley crop is the earlier T1 timing so the T2 spray aims to retain green leaf, manage any remaining foliar diseases, and keep ramularia levels down. Because it is dry at the moment the risk of rhynchosporium leaping up the crop is reduced although weather can flip in a moment. Basically, the options used for T1 will also be good at T2.
Consult with your agronomist or farm advisor for the range of options available to you.
Sign up to the FAS newsletter
Receive updates on news, events and publications from Scotland’s Farm Advisory Service