Sky Pencil Holly Problems. They are great choices for containers, planting in. "Sky Pencil" holly (Ilex crenata "Sky Pencil"), a cultivar of Japanese holly, has a distinctive tall, columnar shape that works especially well for Healthy plants don't usually have problems with this disease. Remember to keep the area surrounding the bush.
This evergreen will tolerate pollution, so it would even make a good addition to an urban landscape. Applying a slow release fertilizer once a year to the top of the root ball will help greatly with these problems. Plus you can easily keep it at any size you want.
Rhizoctonia aerial blight, or web blight, attacks "Sky Pencil" holly when prolonged rainfall, high humidity and warm summer temperatures combine.
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This Japanese holly cultivar that has been developed here in the United States is prized as an ornamental plant. And luckily for those of us who live in colder climates, it does It is not recommended to use an insecticide since that usually kills off the spider mite's predators as well and then you have an even bigger problem. It is a narrow, column-like Japanese holly, which is valued for its small, tightly packed leaves.