Scientific name: Ilex opaca. Pronunciation: EYE-lecks oh-PAY-kuh. Common name(s): American holly. Family: Aquifoliaceae. USDA hardiness zones: 5B through 9 (Figure 2) Origin: native to the eastern half of the United States. UF/IFAS Invasive Assessment Status: native

The paths they follow turn yellowish-brown and typically broaden into a blotch. Their presence inside the leaf protects them from many insecticides. Parasitic wasps and birds are natural predators of these pests. American holly (I. opaca) cultivars are particularly susceptible to leafminer damage.

2023年11月20日 · Pinhead-sized or larger spots frequently surrounded by a purple halo appear on leaves in late winter and early spring. Once thought to be caused by the sharp points of leaves puncturing each other, spine spot is now known to be caused by the ovipositing of certain insects.

spots on the leaves in early summer. Eventually the spots turn reddish brown with narrow yellow borders. Leaves may not drop prematurely but the infected areas drop out leaving holes in the leaves. Gather up and destroy badly infected leaves. Many different fungi cause leaf spots on Holly. Reduce the injury caused by leaf spots by keeping trees ...

Ilex opaca, commonly called American holly, is an upright, pyramidal, evergreen tree that slowly matures to 15-30' in cultivation, but may reach 50' tall in the wild. It is native to the eastern and central U.S., most frequently found in moist woods, forest bottomlands and swamp peripheries plus some coastal dunes (e.g., Cape Cod down the ...

As a general rule, only improved selections of I. opaca should be used for landscaping, since they will have superior appearance and utility to most seedlings. There are many cultivars to choose from, but those listed below are most common and/or adapted for New England growing.

Ilex opaca (American Holly) Holly Family (Aquifoliaceae) Botanical Characteristics: Native habitat: Massachusetts to Florida, west to Texas and Missouri. Growth habit: Densely pyramidal with branches to the ground when young; becomes open, irregular and high branching with age. Tree size: 40 to 50 feet tall with a spread ranging

Ilex opaca. The American Holly is considered one of the most popular trees in the world. Due to extensive cultivation of the American Holly by nurseryman and gardeners alike, there are currently over 1000 different cultivars, with more being patented every year (Holly Society of America). The tree is ridiculously tough.

Scientific name: Ilex opaca ‘Slim Jim’ Pronunciation: EYE-lecks oh-PAY-kuh Common name(s): ‘Slim Jim’ American Holly Family: Aquifoliaceae USDA hardiness zones: 6 through 9 (Fig. 2) Origin: native to North America Uses: Bonsai; hedge; recommended for buffer strips around parking lots or for median strip plantings in the

Spine spot is small gray or yellow spots with purple margins and is caused by spines of one leaf puncturing an adjacent leaf. Chlorosis symptoms are light green or yellowish leaves with darker green veins. This problem is often due to a high pH leading to iron deficiency. Use acidifying fertilizers and sulfur to bring down the pH.