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Black rot, leaf spot and canker Botryosphaeria obtusa Sphaeropsis malorum [anamorph] Black spot (of Japanese pear) Alternaria alternata. Blister canker Helminthosporium papulosum. Blister disease Coniothecium chomatosporum: Blue mold rot Penicillium spp. Penicillium expansum. Botrytis spur and blossom blight Botrytis cinerea
The corresponding stage on the pear trees is known as aecia. The telia and aecia release wind borne resting or hibernating spores (called teliospores and aeciospores) capable of infecting susceptible pear leaves and Juniper respectively. Spores produced from the fungus-induced swellings on juniper stems can be infectious up to 6 km.
In southern Germany apple and pear trees have been a part of the landscape for a long time, and are difficult to protect. The decline of apple and pear trees from their landscape can be expensive to replace and could have a negative effect on tourism. In the long-run, fire blight is a very important factor of economy and society. [citation needed]
The leaves are compound with up to 10 pairs of leaflets, which are elliptic about 5–7 centimetres (2.0–2.8 in) long and 2–3 cm (0.79–1.18 in) wide. Its highly ornamental seeds mean it's sometimes referred to as the black pearl tree or velvet-seed tree.
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 ...
In the French Antilles the trees are often marked with a painted red band roughly 1 metre (3 ft) above the ground. [16] Although the plant is toxic to many birds and other animals, the black-spined iguana (Ctenosaura similis) is known to eat the fruit and even live among the limbs of the tree. [10]
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]
Stroma is located in the black lesions of the infected leaves. [2] Conidiophores form non-infectious conidia that are released both in conditions of wetness and drought. [ 2 ] [ 7 ] The most favorable environment for the pathogen is when there is an extended period of moisture such as fog or rain, which prevents the leaves from drying out. [ 8 ]