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Rhytisma acerinum is the teleomorph of tar spot. In the spring, needle-shaped ascospores are released from overwintering apothecia in fallen leaf debris. [2] [7] These spores are disseminated by the wind and have a sticky coat to attach to new healthy leaves. [4] Once on the leaves, the spores germinate and penetrate through the stoma. [2]
Bacterial leaf spot caused by Pseudomonas cichorii on a hibiscus leaf. Bacterial leaf spots show as necrotic, circular or angular lesions and may have a yellowish outline or halo [7] Early symptoms of bacterial leaf spots show on older leaves and lesions appear water-soaked. [12]
Symptoms include needles developing yellow spots, horizontal brown bands around the needles, swelling of needles, and off-white fruiting bodies formed on infected needles. [ 2 ] [ 3 ] Because Cyclaneusma is an ascomycete it produces two spore types, an asexual ( conidiomata ) and sexual ( ascomycota ) spore.
5. Low Humidity. Light brown spots scattered across fiddle leaf fig leaves can be caused by dry air. If the brown spots in question have a pox-like look instead of being in a single area of the ...
The leaves (needles) are five per bundle , spreading, 8–14 cm long, 0.6-1.0 mm in diameter, straight, slightly twisted, pliant, dark green to blue-green, and persist 3–5 years. The upper surfaces (adaxial, facing the centre of the fascicle) is conspicuously whitened by narrow stomatal lines. The lower surfaces (abaxial, the outer face away ...
Bidens alba is a species of flowering plant in the family Asteraceae, commonly known as shepherd's needles, beggarticks, Spanish needles, or butterfly needles. [1] Bidens means two- toothed, describing the two projections found at the top of the seeds, and alba refers to the white ray florets. [ 2 ]
C. rumicis L. (3i). Forewing dark grey, varied in places with whitish; lines and shades black; outer line marked by a white spot on the submedian fold; hindwings brownish fuscous Larva marbled dark and light grey: a dorsal row of red spots on black blotches, and a row of white spots on each side; a pale line below spiracles, containing orange-red tubercles; segments 5 and 12 of dorsum humped ...
The variegation of the leaves arises from the distinct white veins contrasted with the dark green of the leaf. The stems emerge from creeping rhizomes, growing 10–25 cm (4–10 in) tall. The nearly round flowers, which appear in early summer, are found on top of tall stalks. They are white or pinkish and are insect pollinated. The flowers ...