Cylindrocladium pteridis leaf spot of apricot tree in the state of Para, Brazil

Poltronieri, L. S.; Alfenas, Acelino C.; Zauza, Edival Â. V.; Trindade, D. R.; Poltronieri, M. C.

doi:10.1590/s0100-41582004000100019

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“…Cylindrocladium species infect a variety of host species and may cause significant losses, especially under tropical and subtropical conditions (Bertus, 1976; Alfenas, 1986; Dianese, 1986; Booth et al ., 2000; Cedeño & Carrero, 2000; Poltroniere et al ., 2004). Several species of this fungus infect eucalypts ( Eucalyptus and Corymbia ) causing diseases such as seedling damping off, root rot, stem canker and leaf blight (Mohanan & Sharma, 1985; Alfenas, 1986; Ferreira, 1989; Crous et al ., 1993; Booth et al ., 2000; Cedeño & Carrero, 2000; Alfenas et al ., 2004).…”

Section: Introductionmentioning

confidence: 99%

Factors influencing infection of eucalypts by Cylindrocladium pteridis

et al. 2009

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The pattern of Cylindrocladium pteridis adhesion, germination and penetration in eucalypt leaves was assessed using scanning electron microscopy. The effects of inoculum concentration, leaf wetness period, plant age and branch position of cylindrocladium leaf blight and defoliation severity were assessed in greenhouse studies using two Eucalyptus grandis × E. urophylla hybrid clones. Penetration occurred through stomata, and there was no difference in the number of penetrations between young and old leaves. Percentage leaf area with lesions and defoliation increased with the increase in inoculum concentration (1 × 102 to 105 conidia mL−1), duration of leaf wetness period (6 to 48 h) and plant age (60 to 180 days). Branch position in plants also significantly affected the percentage leaf area with lesions and defoliation, the latter variable being significantly higher at the stem base. The highest values of lesion area were also observed on leaves at the stem base in both clones. The Pearson correlation between defoliation and leaf area with lesions was significant in all experiments (r > 0·9) indicating a high association between these two variables.

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