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FAQs March 2016

What are the use up dates for APHOX old label (MAPP 10515)?

Distributors must sell APHOX (MAPP 10515) by 31 July 2016. Growers must use up by 31 July 2017. Now that EFSA have reviewed the MRL status, growers are only permitted to apply one application of APHOX (MAPP 10515) to the crops on the old label, but they will no longer be able to use it on brassicas (except Brussels sprouts), fruit, sweetcorn, protected lettuce after 16 August 2016. All APHOX (MAPP 17401) being sold from Syngenta now will have the new label (peas and beans only).

Can other chlorothalonil brands be applied to cereals at T0 or T1 if BRAVO can only be used once between GS30-32?

Other options would be AMISTAR OPTI or CHEROKEE. Syngenta do not advocate using other straight brands of chlorothalonil at this time. Be mindful that Syngenta have a product stewardship in place for no more than 2000 gms chlorothalonil per crop.

Any news on the DEFY on spring wheat EAMU under new MAPP No 16202?

This was applied for and turned down by CRD, therefore there is no EAMU for DEFY on spring wheat.

Winged aphids being found in some cereal crops, is it too cold to apply HALLMARK ZEON?

If winged adult aphids being found, then these will quickly multiply as the weather warms up, therefore would advise applying 50 ml/ha HALLMARK ZEON.

What should I do if the weather turns very dry after applying NEMATHORIN?

Best use advice if a prolonged period of dry weather is experienced prior to, at or post planting, is to consider irrigating the crop prior to tuber initiation.

Switching from Vydate to NEMATHORIN, what is best use advice?

NEMATHORIN has no approval for use in-furrow. It has a 119 day harvest interval, therefore not suitable for earlies. This also means that crops cannot be desiccated or green top lifted prior to 119 days. The dose rate for PCN and spraing is 30 kg/ha, and for wireworm 15 kg/ha. If using NEMATHORIN for PCN or spraing, do not reduce the dose rate below 30 kg/ha. If using NEMATHORIN for wireworm, do not reduce the dose rate below 15 kg/ha. Rotors or cassettes must be appropriate for the nematicide.

Very thick, forward crop of oilseed rape, and seen a few pollen beetle. What is the threshold for pollen beetle and dose rates for PLENUM?

The thresholds are based on the maximum number of buds each beetle can destroy and the number of excess flowers produced. <30 plants/m2, the threshold is 25 pollen beetles/plant; 30-50 plants/m2, the threshold is 18 pollen beetles/plant; 50-70 plants/m2, the threshold is 11 pollen beetles/plant; >70 plants/m2, the threshold is 7 pollen beetles/plant. Dose rate for PLENUM to be applied at green bud stage of the crop when pollen beetle reach their threshold is 0.15 kg/ha.

Oilseed rape is very variable across the field, some at stem extension and some at flower bud, should TOPREX be applied?

Yes @ 0.35 l/ha to prevent a protracted flowering period leading to increased light reflectance, and also help even up the canopy height enabling increased light penetration to lower yield contributing leaves and ultimately pods.

Are there any following crop issues when TOPREX has been used in the spring in oilseed rape?

In normal rotations, only cereals can be drilled following the use of TOPREX in oilseed rape. Broad-leaved crops (including oilseed rape) should not be sown for at least 16 months after the use of TOPREX. Potatoes should not be planted within 3 years of the last application of TOPREX.

Unable to access the weather information on the Syngenta website!

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