What is ailing these fellows?

looks like "leaf Blight " to me, caused by a fungus.

In the past you could get a fungicide to spray them, but I dont know if still available to buy.

At first I thought could be vine weevil damage as well but it would have more notches in the side of the leaf not the middle so I would say its where the fungus has grown caused it to die and probably turn brown and that is how the holes have been produced.

Lets see what are other GC members may think ....

 

Yes, I agree about it probably not being Vine Weevil, usually notches around the edge of the leaves. As for fungicide, would not Bordeaux Mixture be worth trying?

 

Well the first 3 pics are rhodos or azaleas aren't they? best ask @merleworld about those.

 

Bit of an odd one - all you can see is holes on the first one and the rest of the plant looks relatively healthy I'm not an expert but could be fungal - but also could anything caustic have been spilled on it ? Could some sort of caterpillar have eaten it? Have a look at the pic on this link.

The last one may be Vine Weevil or some other beastie as that has been eaten on the edges of the leaves.

FC if you email the pics to Millais Nurseries they are usually very helpful. Might get more responses if you have it moved to the 'pests and diseases' bits.

 

I reckon the holes in the leaves were caused by snails.

The brown bits are probably a fungus, if it appears on the new growth I would be worried, but as its on the old leaves, I wouldn't worry too much, you wont be able to see it in a few weeks.

Might be worth spraying the new growth with a fungicide, once its hardened up around late July, as a guess.

 

I've got only one Rhodo, but it has the same holes in the leaves.

Dont have the brown areas on any leaves though.

 

Bordeaux Mixture is still available

 

I can't imagine there would be any problem with it. Thinking about it, I'm not sure if it will actually get rid of any fungal infection as its normally used as a preventative measure.

Just looked it up, seems it won't be effective once the fungus is present.

 

Just had another look at mine, it looks like it happened a while ago, the holes are not fresh, and I agree it could have been some kind of caterpillar, but probably last year.
Sorry pic is a bit dark.