We tested this hypothesis using the Alternaria dauci – carrot pathosystem. Alternaria dauci, causing carrot leaf blight, is a necrotrophic fungus. Carrot is among the most important vegetable crops because of its composition and vitamin content. The fungi belonging to genus Alternaria, especially A. dauci . A. dauci is a fungal species with an ability to cause symptoms on a large range of dicotyledonous plants. This fungal species harbors a strong.

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In leading seed companies, breeders’ seed and especially stock seeds are tested for pathogens and, in many cases, routinely treated regardless of test results. Alternaria Fungal plant pathogens and diseases.

Alternaria dauci (ALTEDA)[Overview]| EPPO Global Database

Strandberg observed symptoms of the disease caused by A. In the greenhouse, a UV-absorbing vinyl film inhibited sporulation of A. Center for Agriculture, Food and the Environment. Sexual reproduction of Alternaria dauci is not known to occur, [1] and the disease is most active during spring, summer, and autumn cropping cycles.

Production and transmission of Alternaria dauci is heightened during moderate to warm temperatures and extended periods of leaf dquci due to rainfall, dew, or sprinkler irrigation.

EPPO Global Database

It has been suggested that resistance of young carrot leaves to A. Alternaria dauci is one of two leading pathogens affecting carrots around the world.

The older leaves are more heavily infected than the young ones Hooker ; Maude, ; Hentschel and Glits, ; Soteros, b. This page was last edited on 23 Marchat Infected seedlings may be killed before or after emergence, often allternaria damping-off symptoms: The lesions are irregular in shape, dark-brown to black.


It can persist in soil for up to 8 years.

Leaf blight of carrot. Older leaves are more susceptible to infection. Moreover, spatial isolation of alternarix fields required for hybrid seed production is ascertained by seed producers who are growing hybrid crops in the area.

Recommendations vary depending on location, but 2 years is alternarix minimum allowance for rotation. Views Read Edit View history. These lesions are most often found on mature leaves, where full necrosis often follows. Lesions produced on leaf and petiole tissues are generally dark-brown to black, and chlorosis of surrounding tissues is observed. All flower parts were susceptible to rauci. In North Carolina, epidemics of A. Cultural practices can also promote reduction of Alternaria dauci.

The fungus was normally confined to the pericarp tissues of viable seeds.

Chupp and Sherf indicated 3-year or even longer rotations as important. These practices have resulted in a very low incidence of pathogenic Alternaria spp.

Like most websites we use cookies. By using this site, you agree to the Terms of Use and Privacy Policy. Dispersal daucl occur through multiple avenues such as rain splash, farm equipment, workers, and insects. The fungus survives in the soil on crop debris but dies when the residue decomposes. Both Alternaria diseases are hard to target with fungicides once the cauci canopy has closed. At the earlier stages of seed development, the infection led to the extensive colonization of embryo and endosperm by the pathogen and such seeds lost their viability, being also shrivelled and discoloured.


It may be generally true that, following seedling infection, secondary inoculum is spread to infect leaves or additional, healthy plants under conditions which are favourable for the disease from plants which are infected, but not killed Neergaard, Minimize wounding and breakage. The English name of the disease it incites alternraia “carrot leaf blight”. For further information, we recommend you visit the following resources: Cookies on Plantwise Knowledge Bank Like most websites we use cookies.

One phytotoxin in particular, Al toxin, has been shown to both reduce chlorophyll production in leaves aalternaria well as cause stunting.

Following these events, conidia are repeatedly produced from leaf and stem lesions throughout the summer months, allowing the pathogen to be dispersed to its surrounding environment.

Iprodione tolerant strains of A. The decay is dark-brown to black, firm and shallow. The possibility of using phytoalexin production in carrot cell cultures to evaluate leaf blight susceptibility was investigated by Bruemmer and White A heritability estimate for resistance to A. Alternaria dauci can spread rapidly if not controlled.