![]() ![]() Virginia Tech has provided a Youtube video to provide additional information on this common disease in hollies (5). Sky Pencil Japanese Holly is primarily valued in the landscape or garden for its rigidly columnar form. Plants with extensive root rot damage will usually decline and die during dry periods (4). ![]() (2) A diagnostic sign is the blackened areas on the roots, which include the fungal spores (2). Plants initially turn off-color, but sections of the plant gradually turn brown, and eventually the whole plant dies. Note that it is also advisable to avoid planting pansies, petunias, phlox, annual vinca, coral bells, and zinnias in soil where black root rot has been diagnosed because these herbaceous plants are also susceptible to the disease (2). Many Sky Pencil Holly growers use the tree as a standalone focal point on a patio or deck. Many outdoor plant providers sometimes sell them as the Japanese Holly. English holly ( Ilex aquifolium) and Chinese holly ( Ilex cornuta) are highly resistant (3). Table of Contents A tree that is unique on its own to add to the garden is the Sky Pencil Holly. opaca (American holly) can also be affected. Japanese holly is especially susceptible to this disease however, some other hollies, such as Ilex glabra (inkberry), I. Pests such as leaf miners, scales and spider mites, often cause problems for holly trees, including Sky Pencil Holly. Splashing soil on it would not cause problems. The most common cause of dieback in Japanese holly is the root disease, black root rot, which gets its name from the masses of black fungal spores that form in and on infected roots. Ilex crenata Sky Pencil is a terrific plant, isnt it Yep, its another japanese holly. While a preventative soil drench (1) can be used on remaining plants or new transplants, consideration should be given to planting a different species that is not susceptible.Īlthough Japanese holly ( Ilex crenata) is a popular broadleaf evergreen in Virginia landscape plantings, dieback is a common complaint. The pathogen is soil borne, so any plants showing dieback should be removed. Samples sent to the Virginia Tech Plant Disease Lab, which diagnosed the problem as Black Root Rot ( Thielaviopsis basicola), a fungus disease. One could also plant them close together to forma very narrow hedge.The client was concerned about 10 year old Soft Touch hollies, that are suffering from severe dieback and decline. Designers will often flank a doorway with 2 of these plants. This columnar holly makes a great vertical accent in narrow spaces. This cultivar is easily grown in average, medium, well-drained soils in full sun to part shade. Small black berries may form in the fall from these flowers, but they are not all that note-worthy. 4 Sky Pencil Holly Problems and Diseases to Deal - garden gardening skypencilholly pecilholly. Knowing what these are and damages involved can easily help solve such infestation. Tiny, greenish-white flowers appear along the stems in the leaf axils in late spring, but are not considered all that showy. There are a few common sky pencil holly problems to take care of. The foliage resembles that of boxwood, as opposed to holly. Leaves are elliptic to obovate (wider past the middle), small (1/2” to 1” long), and have serrulate margins, particularly at the rounded tips. Botryosphaeria canker, caused by the fungal pathogen Botryosphaeria spp. With pruning a typical specimen will remain ‘4-6' tall, but only 1’ wide. Sky Pencil Japanese Holly Problems (Common Diseases) Botryosphaeria canker: Threatening the trunk. This evergreen shrub will grow to 8’ in height but stay less than 2” in width. The key to keeping a healthy sky pencil holly is to regularly inspect it for signs of damage or disease and take prompt action. The name Sky Pencil reflects it strict upright growth habit. Sky pencil holly is vulnerable to a range of diseases, such as leaf spot, twig blight, and leaf scorch, and can suffer from damage due to pests like spider mites and scale insects. Description The narrow, columnar form of Japanese Holly is just right for small areas. ![]()
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