Abstract
Isolates of Pyrenophora graminea resistant to organomercury were obtained from barley crops in England and Scotland in 1984–6. Resistant isolates were approximately 100 times less sensitive in vitro than sensitive isolates to phenyl mercuric acetate (PMA), but the difference was only four times for methoxyethyl mercuric acetate (MEMA). In small‐plot field trials, seed treatment with either PMA or MEMA gave good control of leaf stripe disease caused by organomercury‐sensitive strains of P. graminea but neither compound gave commercially acceptable control of resistant strains. Fungicides with different modes of action (triadimenol + fuberidazole, flutriafol + ethirimol + thiabendazole, carboxin‐+‐ thiabendazole + imazalil, and guazatine + imazalil) were effective against organomercury‐sensitive and organomercury‐resistant strains. The few cases of resistance found do not justify a change from the use of organomercury as the standard seed treatment for barley.
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