2015-07-01   facebooktwitterrss

Treat Silage Broad-leaved Weeds Later if Regrowth is Slow

Cold, dry conditions in the past two weeks, have slowed the regrowth of grass and broad-leaved weeds like docks and thistles, in silage crops cut at the beginning of June.

This could delay any between-cut herbicide applications, predicts Andy Bailey, grassland agronomy specialist for Dow AgroSciences.

Plan to tackle perennial weeds between cuts when they are the right size for treating – about 20cm high or across.

Plan to tackle perennial weeds between cuts when they are the right size for treating – about 20cm high or across.

“On farms I have visited in the past week, aftermath growth has been pitifully slow,” says Mr. Bailey. “Unless we get a spell of really warm and humid weather, this situation is unlikely to change. Anyone planning to tackle perennial weeds between cuts will have to wait longer than the usual three weeks or so, for them to get to the right size for treating – which is about 20cm high or across.”

Mr. Bailey advises farmers to inspect the fields regularly to check for fresh weed leaves. If the window of opportunity for spraying closes between cuts, it is possible to spray with modern, translocated herbicides like DoxstarPro into September and still achieve good results.

“It is better to wait for the conditions to be right than attempt to spray when the weather is wrong, or the weeds are not at the right stage,” says Mr. Bailey.

“It is not traditional to spray docks in late summer and early autumn, but there is no performance-related or legal reason for not doing so.

“It is also possible to use the highly effective broad-spectrum herbicide Forefront T after the final silage cut. This will make a very good job of clearing up fields so they will be free of weeds the following spring.”

Dow

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