pustule. Small blisterlike elevation of epidermis from which spores emerge.
pycnidium (plural: pycnidia). Small, spherical or flask-shaped structure, formed by certain types of fungi, inside which spores are produced.
Q ...
Small orange pustules appear on the underside of leaves. They rupture and spread spores which pass the disease to other leaves on the plant and other Plumerias growing nearby. The upper sides of the leaves become discolored.
Leek rust, orange pustules on the leaves, can also affect leaves in damp weather. Remove the affected leaves and improve air circulation. New growth should come in healthy.
Remove affected foliage; later maturing foliage will be healthy.
Remove leaves as soon as pustules appear on the under side. Destroy all foliage and stalks in the autumn.
Small pustules appear on the underside of leaves. These pustules burst open to discharge bright yellow or brownish spores that re-infect the rhododendrons or azaleas.
Hollyhocks are infamous for being plagued by a fungal disease called rust, which produces reddish colored pustules (spots) on the upper and lower surfaces of leaves, stems, and green flower parts and causes early leaf drop.
Brown rust causes yellowish spots on the upper leaf surface and rusty brown spore pustules beneath - often appearing as a ring. It tends to spread when conditions are warm and wet.
Rust first appears on the underside of the lowest leaves as lemon-yellow to orange, almost waxy, pustules that turn reddish brown with age. Pustules are small, blister-like formations.
Over the last few years rust has become a major problem with frangipanis, and it causes yellow orange pustules to appear on the underside of the leaf. The other side of the leaf becomes almost transparent.
The fungus enters skin through cuts and scratches on fingers, arms or legs. Small pustules will develop on the skin. Pustules will swell and turn red. The disease can spread to the bones and other organs. Death can occur in extreme cases.
Symptoms: Reddish brown spots and powdery pustules that look like rust.
Prevention/Control: Grow resistant varieties and sow hollyhocks from seed every year. Spray with a suitable fungicide, such as one containing mancozeb or penconazale.
Bright orange or dark brown spores inside pustules on the stems.
Remove and burn affected stems. Clear leaf and other litter from beneath plants where the fungal spores can overwinter. Spray with a fungicide.
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Cedar Apple Rust Small, rust-coloured pustules form on the undersides of leaves. Control with a sulfur spray when the buds have a pinkish tinge and again three weeks after petal fall.
-- . The botanical name of the fungus is Puccinia hemerocallidis and causes raised pustules on the leaves and scapes of affected plants.
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I can just see the catalogue description now: "Long, striped green fruit with golden, disease-like pustules splashed across the surface."
It's actually kind of disturbing. In a fascinating way.
Squashes ...
Basidiospores that land on young apple tissue may germinate and infect if a film of water is present for an adequate amount of time (Table 1). One to two weeks after infection, orange pustules (pycnia) containing pycniospores appear on the upper ...
Capsaicin appears as a yellowish band along the inner walls of the chile pod; the more yellowish the inner walls, the hotter the chile. Seeds inside the chile are not hot - until pustules of capsaicin burst onto the seeds.
 See also: Plant, Rust, Water, Leaf, Spore
  
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