Holly: Boron deficiency categories: Holly Holly Diseases Ornamentals Shrubs revision date: 2022-12-02 12:00 Necrotic spotting on leaves from boron deficiency Photo by: R.S. Byther Biology Boron deficiency in holly is characterized by the appearance of spots on the leaves. The spots initially are red to purple and irregularly shaped on the upper surface. They appear […]
Holly: Green algae categories: Holly Holly Diseases Ornamentals Shrubs revision date: 2022-12-05 12:00 Green algae on hollyPhoto by: B.M. Johnson Biology Green algae grows on the surface only of leaves, twigs, and trunks. Wet, humid weather favors development of these microscopic, moisture-loving, primitive plants. The colonized holly is not harmed unless sufficient algal growth develops […]
Holly: Phytophthora leaf & twig blight categories: Holly Holly Diseases Ornamentals Shrubs revision date: 2022-12-02 12:00 Holly Phytophthora leaf and twig blightPhoto by: J.W. Pscheidt Biology Leaf and twig blight of holly is caused by a different Phytophthora species than is associated with root rots. Symptoms first appear in the fall and winter during wet, […]
Holly: Red leaf spotting categories: Holly Holly Diseases Ornamentals Shrubs revision date: 2022-12-02 12:00 Holly red leaf spottingPhoto by: J.W. Pscheidt Biology Red leaf spotting of holly is a general category which includes physical or pesticide damage, nutritional deficiency, and disease symptoms. Damage from the holly’s own spines can cause leaves to develop red or […]
Holly: Brown soft scale categories: Holly Holly Insects Ornamentals Shrubs revision date: 2024-04-08 11:46 Brown soft scalesPhoto by: R.S. Byther Biology Brown soft scales are yellowish to dark brown insects (adults are usually darker) up to approximately 1/8″ in diameter. They are found mainly on the underside of leaves or on green twigs. Soft scales […]
Holly: Cottony camellia scale categories: Holly Holly Insects Ornamentals Shrubs revision date: 2024-04-08 11:46 Cottony camellia scale on holly leavesPhoto by: A.L. Antonelli Biology The cottony camellia scale is a flat brownish or yellowish insect about 1/8″ in diameter. The scales overwinter on twigs or evergreen leaves. In the spring, the adult females lay cottony […]
Holly: Holly bud moth categories: Holly Holly Insects Ornamentals Shrubs revision date: 2022-12-02 12:00 Holly bud moth larvae damagePhoto by: Unknown Biology The adult holly bud moth is a mottled brown and black insect with a wingspan of approximately 1/2″. Overwintering eggs hatch in the spring. The larvae begin feeding on buds but soon move […]
Holly: Holly leafminer categories: Holly Holly Insects Ornamentals Shrubs revision date: 2022-12-05 12:00 Holly leafminer trailsPhoto by: R.S. Byther Biology The holly leafminer feeds on English (Ilex aquifolium), American (I. opaca) and Japanese (I. crenata) hollies, tiny green blisters on the lower leaf surface often indicate sites where the females deposited eggs. Characteristic damage by […]
Holly: Lecanium scale categories: Holly Holly Insects Ornamentals Shrubs revision date: 2024-04-08 11:46 Lecanium scales on twigPhoto by: R.S. Byther Biology Lecanium scales are shiny brown insects found on leaves and twigs. Adults are 1/8″-1/4″ in diameter and roughly turtle-shaped. Crawlers (immature scales) are flatter. Scales produce large amounts of honeydew, a sweet, sticky material […]
Holly: Orange tortrix categories: Holly Holly Insects Ornamentals Shrubs revision date: 2023-04-12 12:00 Orange tortrix larva on raspberryPhoto by: R. LaLone Biology The larval stage of the orange tortrix is a leafrolling caterpillar. The larvae are tan to pale green with tan heads and about 1/2″ long at maturity. The feeding caterpillars typically roll or […]