EPPO Global Database

Lecanosticta acicola(SCIRAC)

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Brown spots and necrotic bands on needles (with resin-soaked spots) of Pinus mugo caused by Mycosphaerella dearnessii (Lecanosticta acicola).

Lecanosticta conidia, to show variation in spore form with increasing altitude, on Pinus maximinoi (note decrease in size, septation, pigmentation and ornamentation with increasing altitude.

Courtesy: H.C. Evans, CABI, Wallingford (GB).

Lecanosticta conidia, to show variation in spore form with increasing altitude, on Pinus maximinoi (note decrease in size, septation, pigmentation and ornamentation with increasing altitude.

Courtesy: H.C. Evans, CABI, Wallingford (GB).

Brown to grey needles on Scotch pine (A) and stone pine (B) infected with brown-spot needle blight; conidial masses are protruding from both sides of the conidiomata under damp conditions (C) (bar 1 mm).

Courtesy: D Jurc, Forestry Institute, Ljubljana (SI).

A. Stromatic hyphae, conidiophores, conidiogenous cells and developing conidia in lactophenol-cotton blue (bar 20 µm) - B. conidia in water showing light brown colouration and verrucose structure (bar 50 µm) - C. in lactophenol-cotton blue showing septa and a thickened wall ( bar 20 µm).

Courtesy: D Jurc, Forestry Institute, Ljubljana (SI).

Spots of black stroma of Micosphaerella dearnessii (Lecanosticta acicola) developing under the needle epidermis (Pinus mugo).

M. dearnessii on Pinus oocarpa; note linearly arranged, solitary erumpent ascostromata.

Courtesy: H.C. Evans, CABI, Wallingford (GB).

Fructifications of Mycosphaerella dearnessii (Lecanosticta acicola) rupturing needle epidermis of Pinus mugo.

Conidia of Lecanosticta acicola.

Attack of Mycosphaerella dearnessii (Lecanosticta acicola) on Pinus mugo.

Lecanosticta (M. dearnessii anamorph) acervulus (transverse section); note dark (green) spore mass.

Courtesy: H.C. Evans, CABI, Wallingford (GB).

Lecanosticta anamorph of M. dearnessii; note solitary, discrete acervulus with green conidial cirrhus exuding onto needle.

Courtesy: H.C. Evans, CABI, Wallingford (GB).

Mycelium from an infected needle with olive green conidial masses after 15 days from isolation on malt extract agar (bar 5 mm).

Courtesy: D Jurc, Forestry Institute, Ljubljana (SI).

Slimy-dark green spore mass of Lecanosticta acicola produced from conidiomata under moist condition.

Asci of M. dearnessii.

Courtesy: H.C. Evans, CABI, Wallingford (GB).

M. dearnessii on Pinus sylvestris; infection is more severe on the lower portion of the tree, especially on the north side where moisture conditions are most conducive to disease development.

Courtesy: D.D. Skilling (US).

Sporulating culture of Lecanosticta acicola on malt extract agar.

Ascospores of M. dearnessii.

Courtesy: H.C. Evans, CABI, Wallingford (GB).

Close-up of brown spot (M. dearnessii) symptoms on Pinus oocarpa.

Courtesy: H.C. Evans, CABI, Wallingford (GB).

Brown spots and necrotic bands on needles of Pinus mugo caused by Mycosphaerella dearnessii (Lecanosticta acicola).

M. dearnessii (brown spot needle blight) on second year foliage of Pinus maximinoi.

Courtesy: H.C. Evans, CABI, Wallingford (GB).

Cross section through a conidioma of Lecanosticta acicola (staining: thionine).

Close-up of M. dearnessii infection on Pinus sylvestris needles.

Courtesy: A.G. Kais (US).

Dothistroma (M. dearnessii anamorph) conidia, from Pinus radiata; note hyaline, smooth, filiform, 1-3 septate spores.

Courtesy: H.C. Evans, CABI, Wallingford (GB).

M. dearnessii infection on a Pinus sylvestris seedling.

Courtesy: A.G. Kais (US).

Attack of Mycosphaerella dearnessii (Lecanosticta acicola) on Pinus mugo.

Conidia of M. dearnessii.

Courtesy: A.G. Kais (US).

Fructifications of Mycosphaerella dearnessii (Lecanosticta acicola) rupturing needle epidermis of Pinus mugo.

Brown spots and necrotic bands on needles of Pinus mugo caused by Mycosphaerella dearnessii (Lecanosticta acicola)

M. dearnessii infection on a Pinus palustris seedling.

Courtesy: A.G. Kais (US).

Perithecium, asci and ascospores of M. dearnessii.

Courtesy: A.G. Kais (US).

Acervuli of M. dearnessii on Pinus sylvestris needles.

Courtesy: D.D. Skilling (US).

Typical lesions caused by M. dearnessii on Pinus sylvestris needles.

Courtesy: D.D. Skilling (US).

Lecanosticta conidia, to show variation in spore form with increasing altitude, on Pinus maximinoi (note decrease in size, septation, pigmentation and ornamentation with increasing altitude.

Courtesy: H.C. Evans, CABI, Wallingford (GB).