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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?

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

Curl grubs are the larvae form of scarab beetles, mainly the African Black Beetle. The peak egg laying period for African Black Beetle is mid spring to mid summer. Applying Yates Baythroid from late winter to late spring will help reduce the number of adult African Black Beetles and that lay eggs that would develop into 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 Nature’s Way Citrus & Ornamental Spray .

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.
Category: Pests
Answered: 12:11PM, 14 May 2010

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