control

20 March 1998




Eagles choice for cleavers

control

Better cleavers control is a priority on many farms this

spring. Here we find out how to make the most of an

existing product and consider a new cleavers killer

IF youve got cleavers youll want to control them sometime this spring. For sheer flexibility, cleavers killer Eagle (amidosulfuron) is a popular choice.

Saying it is the early choice and Starane (fluroxypyr), its main competitor, the late option, is too simple, says ADAS Rosemaunds Derek Wade.

"Trials show both control cleavers well up to May. But I feel more comfortable with Eagle used now."

First growth regulator/fungicide sprays provide a useful tank-mixing opportunity, with plenty of scope to adjust dose to weed size, he explains. "30g/ha at the right timing is very effective as a stand-alone product. It is fairly robust and deals with the size of cleavers you are likely to have now. But I quite often add some HBN for weeds like speedwell."

Experience with Eagle and other sulfonylureas or adjuvants may offer further rate reducutions, he adds. "I suspect 20g and a three-quarter rate of Ally would be quite a potent mix."

Where oil has been used, for example in tank mixes with Cheetah, cleavers control has been better than expected, he adds. "I would be very tempted to try one if I used it straight.

But water volumes need care. "Cleavers is a difficult target, so in most instances I am happier at 200litres/ha."

Leics-based independent agronomist Malcolm Harrison finds Eagle particularly useful for clearing up cleavers escaping autumn treatments, but rarely at the full 40g/ha dose. "It is very good for getting early vigorous infestations out of the way. I tend to use it when it is cold when CMPP doesnt work and Starane doesnt work very well. Once we are into the second week in April, all things being equal, I use Starane.

"20-25g/ha of Eagle plus 20g (two-thirds rate) of Ally is a pretty good mix. But it is starting to get expensive so I tend to use it only round headlands."

Carfentrazone-containing products like Lexus Class, Platform S, Ally Express could compete, he notes.

But a good range of tank-mixes may help stave off such competitors, suggests fellow AICC member Richard Cartright in West Sussex. "Carfentrazone has very limited tank-mixing compatibility, especially with fungicides, and you certainly cant use an adjuvant."

In his experience Eagle is likely to be cheaper than Starane this season. "It works well at this time of year. But it is less reliable beyond GS32.

"Where we are using LI700 adjuvant it seems to pep it up a bit. Actipron also seems to help."

Main Eagle drawbacks are poor performance against mayweeds and poppies, especially at lower rates, he says. "Another reason for not using it early is where docks are a problem. Starane controls them well."

Similarly where thistles and following crop restrictions are considerations an Ally/Starane mix is his preferred choice.

EAGLE FACTS

Formulation: 75% water dispersible granules

Pack size (1998): 120g

Label dose range: 20-40g/ha

Max no of treatments: One

Rainfastness: 1hour

Timing: From Feb 1 to before first spikelets visible (GS51)

Water volume: 112-400litres/ha (use latter when crops thick or weeds dense).

When will you hit your cleavers – early or late Eagle is a flexible option.

KEY FEATURES

&#8226 Effective on cleavers & volunteer OSR in cool or warm conditions.

&#8226 Effective on over-wintered "difficult" weeds.

&#8226 Extensive range of two- and three-way tank mixes with:

i) Named sulfonylurea herbicides (Only cereals to follow when tank mixed or in sequence with Ally, Jubilee 20 DF, Lorate 20 DF (metsulfuron-methyl) or Quantum (tribenuron-methyl) or in sequence with Harmony M (metsulfuron-methyl + thifensulfuron-methyl). {Note: No current recommendations with flupyrsulfuron-methyl}.

ii) Growth regulators and fungicides

iii) Cheetah Super (fenoxaprop-ethyl) or Tiger (diclofop-methyl + fenoxaprop-P-ethyl) for combined grass-weed and cleavers control.

&#8226 Adjuvants – AgrEvo says it has too little data to support further rate reductions with oil. But use of Fyzol 11E mineral oil may improve consistency of results in prolonged cold dry weather, it says.


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