Camphor probs...

[NickfromWI]

A row of Camphor trees....just a few of them have this prob.

Sparse foliage, some leaves chlorotic, holes in leaves.

 

[NickfromWI]

Yellowing leaves

 

[NickfromWI]

Here's a clear shots of the holes in the leaves...

 

[Colin]

You could say oh it's nutrient related, magnesium, overdose of phosphorous and perhaps need some nitrogen etc. But my moneys on this.

Phytophthora ramorum-infected Andrew's clintonia bead lily was found at Muir Woods National Monument, Marin County, in March, 2004. The infected plants were under a canopy of redwoods and infected California bay laurel. Symptoms included lesions both at the tip and base of the leaves. Note that over time, the necrotic tissue develops a shot hole appearance .

http://nature.berkeley.edu/comtf/html/host_of_the_month_archive.html#CinnamoumCamphora

This link also shows the species (Cinnamomum camphora) susceptable to the disease.

http://www.aphis.usda.gov/ppq/ispm/pramorum/pdf_files/usdaprlist.pdf

Here's some pics for ya

http://www.forestryimages.org/browse/subthumb.cfm?sub=4603&Start=1&display=15&sort=2

Now over here I would have the soil and the plant tested, over there it's a serious problem if it infact is Phytophthora ramorum.

I see the leaves have no chew marks so it's not a bug or caterpillar etc. The holes are from the necrotic bits falling out. The yellowing I'm not sure but could be compounded by other things such as fertilizers or even concentrated fertilizer burning the roots if they threw some in the holes, watering issues or planting depths etc

Over here I have seen rows of newly planted shrubs die coz of a different type of Phytophthora being in the mulch they used.

My 0.02

 

[bushman]

I HAVE SEEN THAT A LOT THIS SUMMER,IT'S MORE OF ENVOIRMENTAL THING ,THE SUN IS SO HOT THE PAST FEW SUMMERS IS SO HARD ON YOUNG STREET TREE'S.THE HOLE'S ARE FROM THE LEAF SPOT THAT OCCURED,THEY NEED PREVENTIVE FUNGICIDE EARLY IN THE SEASON TO KEEP THE FOILAGE CLEAN,SOILNUTIENT AND ROOT TEST FOR PHYTOPHTHORA WHICH HAS BEEN REAL BAD THIS YEAR AND LAST.COOL LINK EKKA.

 

[Colin]

Maybe Bushman

But here it gets stinking hot and we have thousands of those weeds, yes they're on the weed list in most councils, toxic to native fish/wildlife. Also coz there so aleopathic they tend to suppress the native vegetation and take over ... mostly on river banks and creeks.

And honestly, I have never ever seen one get sun burn, there's always young suckers around of them.

They're tough, and can take some abuse too.

But it may be that there was some minor spores/fungi or even dew on the leaves etc, maybe. I dont know, be interesting to find out what's going on with them.

If you ever want to clear you sinus's just stump grind one of them.

Hey Nick, they dont look that old, have a dig and check out the roots.