Peanut net blotch caused by Didymosphaeria arachidicola (Chochrjakov) comb. nov

Alcorn, J.L. and Punithalingam, E. and McCarthy, G.J.P. (1976) Peanut net blotch caused by Didymosphaeria arachidicola (Chochrjakov) comb. nov. Transactions of the British Mycological Society, 66 (2). pp. 351-355.

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This disease was 1st recorded in Qd on groundnut in 1964 and has since occurred intermittently. In experimental plots Valencia and Spanish type cvs. were more severely affected than Virginia types. Initially lesions are quite small, consisting of a few linear anastomosing necroses in an irregular pattern. The size increases until large areas of the leaflet are covered by the irregularly reticulate or net like necrosis with apparently healthy tissue in the spaces. The lesions are superficial and confined to the adaxial surface until late in their development when the necrosis may penetrate to the lower surface. Eventually a large reddish brown blotch forms and when several of these coalesce the whole leaflet may be affected. An Ascochyta like fungus was isolated from the lesions which appears to be the same as Mycosphaerella arachidicola Chochrakov (non M. arachidicola Jenkins), M. argenteniensis [RPP 49, 1228] and Phoma arachidicola [RPP 54, 3573] on groundnut, but because of the presence of pseudoparaphyses and brown ascospores the fungus is disposed as D. arachidicola comb. nov

Item Type: Article
Additional Information: SNNigam collections
Author Affiliation: Dep. Primary Industries, Indooroopilly, Qd., Australia.
Subjects: Plant Protection
Crop Improvement
Divisions: Groundnut
Depositing User: Mr T L Gautham
Date Deposited: 27 Sep 2013 06:49
Last Modified: 27 Sep 2013 06:49

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