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21/08/2003
Early warning for oilseed rape beetle damage
An 'early warning' to check now for signs of cabbage stem flea beetle damage to young oilseed rape plants has been issued by BASF.
"There is increasing evidence that the potential for damage by these pests has been underestimated," says BASF's 'beetle specialist' Dave Marris. "These harmless looking beetles can set off a whole sequence of problems from crop emergence onwards."
The first sign of trouble can be seen as soon as the plants emerge when grazing damage by the adult beetles is seen as 'shotholing' of young leaves
A month later the larvae hatch out from eggs laid by the beetles and develop in the young leaf petioles, moving on to the stems to cause the potential for plant loss
This damage to the petioles and stems makes the crop more susceptible to frost as well as being an entry point for diseases such as Phoma
If allowed to multiply in the autumn, the larvae will produce adult beetles the following spring, which can get harvested with the seed and have been known to cause rejection at the crushers.
"This catalogue of damage can only be stopped at a very early stage in the season – it's more difficult once the larvae start burrowing into the stems," Mr Marris says.
His advice is to apply a pyrethroid insecticide to control the beetles as soon as grazing damage is seen on the young leaves.
The product recommended is Contest, as it has been shown to give good control over an extended period - due mainly to a unique formulation that holds the active ingredient on the leaf surface therefore exposing pests to the chemical for a longer period.
A second application is recommended to prevent larval damage to the petiols, normally about a month later.
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"There is increasing evidence that the potential for damage by these pests has been underestimated," says BASF's 'beetle specialist' Dave Marris. "These harmless looking beetles can set off a whole sequence of problems from crop emergence onwards."
The first sign of trouble can be seen as soon as the plants emerge when grazing damage by the adult beetles is seen as 'shotholing' of young leaves
A month later the larvae hatch out from eggs laid by the beetles and develop in the young leaf petioles, moving on to the stems to cause the potential for plant loss
This damage to the petioles and stems makes the crop more susceptible to frost as well as being an entry point for diseases such as Phoma
If allowed to multiply in the autumn, the larvae will produce adult beetles the following spring, which can get harvested with the seed and have been known to cause rejection at the crushers.
"This catalogue of damage can only be stopped at a very early stage in the season – it's more difficult once the larvae start burrowing into the stems," Mr Marris says.
His advice is to apply a pyrethroid insecticide to control the beetles as soon as grazing damage is seen on the young leaves.
The product recommended is Contest, as it has been shown to give good control over an extended period - due mainly to a unique formulation that holds the active ingredient on the leaf surface therefore exposing pests to the chemical for a longer period.
A second application is recommended to prevent larval damage to the petiols, normally about a month later.
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