Abstract
Abstract A description is provided for Mycosphaerella pinodes . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Pisum sativum, Lathyrus, Phaseolus and Vicia . DISEASE: Leaf, stem and pod spot and foot rot of pea ( Pisum sativum ). Lesions on the above-ground parts begin as very small purplish spots which enlarge and becoming more or less zonate and dark brown without a definite margin; they may be circular or irregular in shape with a darker centre. Infection spreads via the petiole to the stem causing girdling lesions; the tap root and proximal parts of the lateral roots can be attacked. Flowers become spotted and pods poorly filled. Infection leads to post-emergence and pre-emergence damping-off, death or dwarfing of older plants and discoloration and shrinkage of seed. GEOGRAPHICAL DISTRIBUTION: Widespread, especially in temperate and sub-tropical areas (CMI Map 316, ed. 2, 1967). New records not yet mapped are: Ethiopia, Greece, Haiti, Iraq, Lebanon, Mexico, Salvador. TRANSMISSION: By water (conidia), air (ascospores), soil and host debris (in which M. pinodes survives between crops) and through seed. Chlamydospores and sclerotia occur and, in the soil, conidia can be transformed into the former. There is some saprophytic ability (20: 441; 44, 2658; 47, 1721; 48, 1389).
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