BOTRYTIS FABAE PDF

Abstract In this study, resistance responses were investigated during the interaction of Botrytis fabae with two faba bean cultivars expressing different levels of resistance against this pathogen, Nubaria resistant and Giza 40 susceptible. Disease severity was assessed on leaves using a rating scale from 1 to 9. Accumulation levels of reactive oxygen species ROS , lipid peroxidation and antioxidant enzymes superoxide dismutase, catalase and ascorbate peroxidase were measured in leaf tissues at different times of infection. The accumulation of these defense responses was induced significantly in both cultivars upon infection with B. The resistant cultivar showed weaker necrotic symptom expression, less ROS accumulation, a lower rate of lipid peroxidation and higher activity of the enzymatic ROS scavenging system compared with susceptible cultivar.

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Symptoms[ edit ] Chocolate spot disease caused by Botrytis fabae manifests itself as small red-brown spots on leaves , stems and flowers of broad bean plants. These enlarge and develop a grey, dead centre with a reddish-brown margin. Spores form on the dead tissue and spread the infection to other plants. In severe infections leaves and flowers may fall and badly affected stems may keel over. It can also be introduced by the use of infected seed. The sclerotia germinate and condiophores are formed, the conidia asexual spores are dispersed by air currents and deposited by rain on susceptible young plants.

When the conidia germinate , small lesions are formed on previously healthy leaves. As the crop grows and within four or five days of infection, conidiophores are produced and secondary inoculum is produced. The conidia are liberated from dead or dying leaves and flowers, usually those that have fallen to the ground, and are spread to other plants in the vicinity by wind and splashes of water.

Alternating wet and dry conditions may lead to spots with a series of concentric growth rings, however during longer periods of wet weather the fungus thrives and the leaf is killed. Infected seed may be stored with healthy seed and infect a new crop. Fungicides can be used but for best results the crop should be carefully monitored, the pathogen should be accurately identified and the crop sprayed with the correct product at the optimum time.

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Symptoms[ edit ] Chocolate spot disease caused by Botrytis fabae manifests itself as small red-brown spots on leaves , stems and flowers of broad bean plants. These enlarge and develop a grey, dead centre with a reddish-brown margin. Spores form on the dead tissue and spread the infection to other plants. In severe infections leaves and flowers may fall and badly affected stems may keel over.

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BOTRYTIS FABAE PDF

The sclerotia germinate and condiophores are formed, the conidia asexual spores are dispersed by air currents and deposited by rain on susceptible young plants. No conidial and sclerotial production was recorded at lower and extreme temperatures. There was a problem providing the content you requested Temperature and variety were considered as main effects and the experiment was repeated twice. The variety Bulga had the largest 6. Home Publications Conferences Register Contact.

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Botrytis fabae

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