I have 8 12-years old pittosporum tenuifolium in my backyard. The trees are about 15-20 feet tall. I see one tree dies within the last 4 weeks. The leaves are getting brown and failing. I see something strange on the tree’s trunk. There are some white spots. I didn’t change the water schedule. The weather condition is unchanged. The gardener advised to remove the tree but I would like to treat it instead. Would you recommend the solution to save this tree?
Yes neem oil is a great solution for this. The scale protects adults from sprays, the eggs hatch in june/july so spray now to knock them on the head. Further reading https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
Thank you very much for the answer!
Would you recommend neem oil to spray?
The spots sound like white scale. If there is an infestation this will affect the plant.if coverage of the scale is light then spray with a suitable insecticide oil. Do not remove the plant unless you are sure it has died! Check the end of the branches are still alive by snipping with secateurs and checking they are still green inside.if this is the case, the plant still has a chance.
Many times, leaves or branches just turn brown and die. Is this just normal? I trim them off and go on. Is there something I need to do about this?
Check whether your plant has any of the disease symptoms described in this article:
Other than a disease, it could be that your plant has a root problem, such as one root wrapped around the others, or is in a too-small pot.
We removed a 5' tall bird of paradise plant 3 years ago and replaced it with some Pittosporum silver sheen. I replaced one plant already twice and another one just died after 2 years. All plants are not really growing in that area. Could it be because of some old roots left over in the soil from the bird of paradise? Any ideas?
If the root ball of the bird of paradise was not removed, it could cause problems growing other plants. Bird of paradise creates a dense, strong root system that could prevent other plants from putting roots into that area. I recommend digging up the area to try to get the majority of the roots out.
Another issue could be nutrient depletion. Adding some compost or fertilizer or taking other measures to build up soil fertility should help.
Unfortunately, Pittosporum is not considered deer resistant and can be attractive to deer.
My Pittosporum was planted last week and now has yellowing leaves in one plant. Help!
Your plant likely has transplant shock, a common problem with recently-transplanted shrubs. Fortunately, most plants will recover from this. Here is some advice on helping it recover:
Also, make sure your Pittosporum is planted in an appropriate location for the species, as described in this article:
I am located in Los Angeles County about 40 miles inland from the ocean. We have had severe drought conditions until this past rainy season (Nov-March). Of 40 pittosporum undulatum trees on our property, 7 have died in the last 10 months. The foliage on the trees that died started to wilt and then the trees died within 3-4 months. I could not find any evidence of the cankers described in your article, "Botruosphaeria Canker Treatment". Starting in June,'16 I soaker hosed the pittosporum for 36 hours every 16 days. I checked with a soil probe before each watering to make sure the soil has dried from the previous watering. Do you have any suggestions for further preventive treatment? Does watering encourage this fungus similar to what happens with phytophera?
From my research the Pittosporum Undulatum is considered quite drought tolerant; especially in older specimen.
If you see no other signs of disease, I would suspect that the plants were effected and died from lack of oxygen--due to the heavy rain and or poor drainage.
Well drained soil is needed for the success of your trees.
Check the soil drainage.
This article will help you.
I have several pittosporum hedges and recently had 18 planted along a side fence. All but five of them survived to get to a reasonable height. Now one of these is also dying and one of my established plants from my front garden has died. Can you give me a reason as to why this is happening? I am sending a photo of the one that is currently dying. It's leaves are beginning to shrivel
From this image, the entire shrub looks wilting and may be in need of water.
Pull back the mulch.
Check the soil moisture levels. Soil should be slightly moist. Long and slow watering followed by a slight drying of soil is the best.
But avoid overwatering, roots in wet, soggy soil will rot.