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The eggs are tiny, stalked, oval, and cream to yellow, darkening before they hatch. The first instar nymphs are yellowish or pinkish and flattened, but later instars are greenish to dark brown, with distinctive red eyes and developing wing buds. The edges of the buds bear three to five knobbed bristles.
Psylla pyri damages pear trees by sucking the plant sap; leaves are yellowed and distorted and flower buds and fruitlets are shed. The excess honeydew produced by the insects coats the leaves, covering up the stomata, and encourages the growth of sooty mould. The size of fruit is decreased and tree growth is diminished. [2]
Like many rusts, G. sabinae requires two different hosts to complete its life cycle from year to year. Juniper is the winter host and pear is the summer host. Spores (called aeciospores) are produced from the fungal lantern-shaped growths which protrude from the blisters on the underside of the pear leaf which become airborne and infect junipers.
Rust, Kern's pear Gymnosporangium kernianum. Rust, Pacific Coast pear Gymnosporangium libocedri. Rust, pear trellis (European pear rust) Gymnosporangium fuscum. Rust, Rocky Mountain pear Gymnosporangium nelsonii. Side rot Phialophora malorum. Silver leaf Chondrostereum purpureum. Sooty blotch Gloeodes pomigena. Thread blight (Hypochnus leaf blight)
The Callery pear tree, also known as the Bradford pear tree, pops up around the area in the early spring. The Kansas Department of Agriculture ordered a quarantine against these trees, which will ...
On the apple tree, the infections occur on leaves, fruit and young twigs. [4] The brightly colored spots produced on the leaves make it easy to identify. Small, yellow-orange spots appear on the upper surfaces of the leaves, anytime from April to June. [5] These spots gradually enlarge and turn orange or red and may show concentric rings of color.
The Callery pear, or Bradford pear, is one of those vampires. Over the years, Callery pear (Pyrus calleryana) has become one of the most widely planted ornamental trees in the US. But over that ...
Gymnosporangium globosum is a heteroecious rust fungus that requires two hosts to complete its life cycle. Its telial stage occurs on eastern red cedar, Rocky Mountain juniper, southern red cedar, and other common junipers while its aecial stage will be found on apple, crabapple, hawthorne, and occasionally on pear, quince, and serviceberry.