Pests and Diseases forum: what a used these shrubs to die

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Name: pavlospefkos
Rhodes, Greece
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pavlospefkos
May 9, 2018 10:44 PM CST
I have recently started to look after a garden on the Greek island of Rhodes. the owner has told me that two of his hedge shrubs have died through not being sprayed with the insecticide Confidor. I somehow doubt it is due to insect infestation, as only 2 in the row have died, separated by a still healthy one. a nearby shrub has sticky white stuff on it as per photo and a very large pine tree stands within 3 metres of the shrubs. can anybody recognise and let me know any possible causes and what further action to take. I have already sprayed with the insecticide as per owners request.
Thumb of 2018-05-10/pavlospefkos/df9dde


Thumb of 2018-05-10/pavlospefkos/bd69ce


Thumb of 2018-05-10/pavlospefkos/2bde19

Name: Sue Taylor
Northumberland, UK
Charter ATP Member Bulbs Bookworm Amaryllis Houseplants Annuals
Garden Photography Lover of wildlife (Black bear badge) Foliage Fan Birds I was one of the first 300 contributors to the plant database! Frogs and Toads
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kniphofia
May 9, 2018 11:15 PM CST
That first photo does look like a very severe insect infestation.

How long have the shrubs been there? It looks like they are in a very dry situation.
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
May 10, 2018 6:40 AM CST
Is there any way you can get a sharper picture than the top one? I'm wondering if that is scale insects but it's too blurry to see any details. Depending on the species of scale insect, if that's what it is, they may or may not be controlled by imidacloprid (the active ingredient in Confidor). Some scale insects secrete "honeydew" with could explain the sticky stuff.
Name: pavlospefkos
Rhodes, Greece
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pavlospefkos
May 10, 2018 6:59 AM CST
I know that the top photo is insect infestation. I am more concerned about the hedge problem and it's possible cause. There is no evidence of insects within any of the hedge shrubs. They do receive water on a regular basis so it's not due to that.
Name: Sue Taylor
Northumberland, UK
Charter ATP Member Bulbs Bookworm Amaryllis Houseplants Annuals
Garden Photography Lover of wildlife (Black bear badge) Foliage Fan Birds I was one of the first 300 contributors to the plant database! Frogs and Toads
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kniphofia
May 10, 2018 9:25 AM CST
So where is the first photo from?
Name: pavlospefkos
Rhodes, Greece
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pavlospefkos
May 10, 2018 10:31 AM CST
First photo is from a shrub 3 feet in front of hedge. My main question is would insects deliberately omit one plant and not spread further outwards.
Excuse me if I come across as a bit dumb, but I am applying what to me is common sense .
Having said that, I am more than receptive to new knowledge.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
May 10, 2018 11:57 AM CST
The green shrubs either side of the dead-looking ones look to have some brown leaves adjacent to the dead ones, unless they are intermingled. Are you saying that the insects that are in the first picture are not on the dead shrubs at all? None of the pictures are clear enough or close enough to identify the problem or the insects, and without knowing what kind of shrubs they are we can't look up what they are prone to.

To answer your question about spreading, I have seen individual plants badly affected by scale insects next to ones that they haven't yet moved onto. But if there is no sign of the insects on the dead plants then that doesn't seem like the problem.

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