13 December 2000
WHAT chemical is best for controlling barley yellow dwarf virus (BYDV)?
There is little to choose between the various aphicides, although some advisors recommend Hallmark for longer protection at full rate.
Seed treatment with Secur (imadocloprid) gives up to 10 weeks insecticidal protection, and follow-up sprays may be needed.
Cultural controls to destroy green bridge is essential.
There are no significant varietal differences and a risk forecasting system is under development. High=risk factors are early drilling and mild winters.