South: Watch out for net blotch

In the middle of last week we had about 8mm of very welcomerain. The ground is now damp, and with the air temperatureaveraging 12C crops are growing rapidly.

Grassweed control is now complete and Atlantis (iodosulfuron +mesosulfuron) applied three weeks ago is working well.

Early drilled wheats are at GS29 and have been treated with a T0fungicide plus a reduced rate PGR. Where required, a dose of traceelements has been included.

Traces of Septoria tritici are visible on new growth in Humber,Oakley and Solstice. All three varieties were severely affected byseptoria in late June last year and I can clearly remember thattowards the end of the month there was sudden senescence in most ofthe leaves.

Treat septoria-susceptible varieties with respect and spraythese at the T0 timing or, if this isn’t appropriate, use a robustrate of a good fungicide such as Ennobe (epoxiconazole +prochloraz) or Proline (prothioconazole) at the T1 timing at GS32.

Winter barley varieties Cassata and Pearl are infected with netblotch and rhynchosporium and will be treated this week at the T1timing with Jaunt (prothioconazole + trifloxystrobin +fluoxystrobin).

Winter barleys have had all their planned nitrogen and winterwheats will receive their main dressing at GS31 in about 10 days’time.

Spring barleys are between GS12 and 14 and until recent rainwere struggling – even the weeds weren’t germinating! There aresome patchy fields around where not all the seed hasgerminated.

Oilseed rape crops are at yellow bud stage with some pollenbeetles present. Early drilled crops which weren’t infested bypigeons and had a GAI of 1 in March and approaching 2 in earlyApril have been treated with a PGR fungicide to help with canopyarrangement and prevent sclerotinia. Temperatures above 10C andrecent rainfall will encourage infection.

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