Evenwith the slow start to the season, growers should start to think aboutcompleting the next stages of the HGCAMycotoxin risk assessment.
Conditionsso far this season will not have had a big impact on risk scores because thetwo biggest factors are rainfall during flowering and rainfall at harvest.However, the late season may affect T3 applications as Dr Simon Oxley, SeniorResearch and Knowledge Transfer Manager at HGCA, explains:
Manywheat crops are behind, which means they are likely to move rapidly through thegrowth stages later in the season. After ear emergence, growers need to beready to get on with the right T3 for their crops and ensure it is recorded aspart of the risk assessment.
Higherdose rates at T3 can reduce the overall risk from fusariummycotoxins. Growers should have already completed the pre-flowering partof the risk assessment, taking into account the effect of cultivation, previouscrop, variety and region.
Thereare a number of other key points growers need to keep in mind when filling inrisk assessments, according to Dr Simon Oxley:
Itshouldnt be assumed that last years risk will be the same as this years asthe amount of rain at flowering and harvest can make a big difference to therisk this season.
Fieldswith the same agronomy, previous crop, sowing date and rainfall can be coveredby one risk assessment. However, it is advisable not to rely on one riskassessment for the whole farm.
Finally,at harvest, if grain with different risk scores is mixed in stores then thehigher risk score should be taken as the score for all the grain. Growersmay, therefore, want to consider storing grain with a higher risk separately.
Legislativelimits for the most common mycotoxins in grain intended for human consumptionhave been in place for several years and guidance limits have also been set foranimal feed. Completing a mycotoxin risk assessment helps growers complywith due diligence and food safety requirements.
Thisseason, HGCA is doing risk assessments for selected Recommended List trialsites which will be updated throughout the season at each stage of the riskassessment. These and all other mycotoxin information, including full riskassessments, are available at hgca.com/mycotoxins, for hard copies of the risk assessment call 024 7647 8730.