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Michele
I had an advanced hedge of pittsoporum James Stirling but one by one they have been killed by white curl grub. How do I eradicate these pests I have used confidor and granules into the soil but still my hedge is dying.

Submitted: 01:14PM, 04 May 2010
Answer: Dear Michelle,

Curl grubs can cause damage to the root system of plants but perhaps there may be some other reason why your Pittosporum hedge is dying. Confidor Hose-on is only registered for use on a lawn area. Without knowing the name of the granules you have used, it is hard to comment, but if the active ingredient in those granules is Chlorpyrifos, then this product is registered to control curl grubs.

Have you checked to see if there is any other insect damage present e.g. thrips. Thrips are sap sucking insects which damage the surface of the leaf. You will notice distortion and rolling up of the leaf as well as a silvery/grey appearance on the leaf. This pest can be controlled with an application of PestOil or Confidor Garden Insecticide.

Drainage is an important part when growing a Pittosporum hedge. Ensure that the water is draining away and the roots of the plants are not waterlogged.

I hope what is left of your hedge is going to survive. Regular applications of seaweed extract will help to improve the overall health of the plant.
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Answered: 12:11PM, 14 May 2010

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