Management of phoma using bio-and conventional fungicides on fresh market dill

C. Miller, G. McAvoy, R. N. Raid

Abstract


Dill (Antheum graveolens) is a popular herb frequently grown for the fresh market. Dill and its close relative fennel (Foeniculum vulgare) are susceptible to Phoma, a foliar disease caused by the fungal pathogen Cercosporidium punctum Earle. Initial symptoms are visible in the lower canopy and may worsen under wet conditions resulting in a severely blighted plant. Older leaves first turn from green to yellow, followed by browning leaf tips. Stems lesions are frequently peppered with small black specks which are the fungal stromata supporting numerous conidiophores which produce spores referred to as conidia that are easily dispersed by wind and water. Rainfall, overhead irrigation, and long dewperiods favor disease development. Hence there is an urgent need to evaluate candidates for control of pathogens with such potential for disease severity and the general limitations of efficacy data on herbs available.


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Proc. Fla. State Hort. Soc.     ISSN 0886-7283