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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)
Dactylopius opuntiae can also have a strong negative impact on both the production of prickly pear fruit for fresh consumption and on cladodes as fodder for livestock feed. The cochineal species tends to form variably sized colonies on cladodes, which in some cases are totally covered by the insect.
Glochids from prickly pears (Opuntia species) can cause an extremely itchy, papular eruption called sabra dermatitis, which can easily be confused with scabies or fiberglass dermatitis. Sabra dermatitis
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Opuntia engelmannii is a prickly pear common across the south-central and Southwestern United States and northern Mexico.It goes by a variety of common names, including desert prickly pear, discus prickly pear, Engelmann's prickly pear [2] in the US, and nopal, abrojo, joconostle, and vela de coyote in Mexico.
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]
This species of prickly pear is mostly found in South Florida, [6] in sandy substrates often in brushy dunes inland and mangrove edges on the coast. [5] Other native habitats include scrub, scrubby flatwoods, and xeric, or dry, disturbed areas. [3]
Gymnosporangium libocedri, the Pacific Coast pear rust, is a plant pathogen and rust fungus. [1] It produces orange gelatinous growths ( telia ) on incense cedar in the spring. Its secondary hosts include apple , crabapple , hawthorn , mountain ash , pear , quince , and serviceberry .