What is killing our Manuka?

[Okura]

We are doing a restorative native planting along a 370 m stream edge in Kerikeri. We have a mix of natives that have been in for a year, including 500 manuka and kanuka. Yesterday we noticed that there are about a dozen dying manuka and kanuka within roughly a 100 m strip. We are frequently in the area and had not noticed this before, plus they have long tips of new growth, so we think this is something quite acute. There are sick ones by healthy ones. The main feature is leaf drop in the mid section of the plant. They are one year old and about 2 metres tall.  Please see photographs posted as observation on inaturalist.nz on 30/8/20 as I can't get this site to accept them.

Can anyone identify what could be doing this and if there is anything we should do to stop it happening to the remaining plants?

Thanks for your help.

[studebak...@gmail.com]

Sounds a bit  like what I saw in some young putaputaweta due to the drought...they didn't lose all their leaves until the drought broke, then they lost all, but some have new growth in the top part. Is this a possibility?

By the way I would like to look at the iNat observation but I don't see a link. I don't look at google. Groups since the iNat forum moved to Discourse, but I got an email with your post, so I must be signed up to whatever group this is posted to...sorry I don't know my way around this site.

[Colin Meurk]

Hi toni

I could not find your record on https://inaturalist.nz/ under okura, monro, toni.monro or manuka on yesterday’s date.

Can u either get the URL for your record and post that to us, or try to load it again?  Did u have any trouble with that?  let us know if u got stuck. Had to ever used iNaturalist before?

A close up of the affected branches may reveal sooty mould and possibly little white specks which could be scale insects. These in combination can sometimes cause a problem for manuka (and kanuka). Sadly these can sometimes cause quite a lot of damage.  There are oil sprays you can use, but is only partially effective.

Let’s hope it is a simple fix.

Here is an example: https://inaturalist.nz/observations/35352001 .

Cheers

colin

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