Resistance to benomyl in <i>Botrytis allii</i> from shallots

Gladders, P.; Carter, M. A.; Owen, W. F

doi:10.1111/j.1365-3059.1994.tb02703.x

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…In order to reduce the incidence of neck rot in storage, several control strategies have been developed that aim to reduce infection during onion cultivation. Application of preventative fungicides for the control of neck rot is a common practice in onion cultivation (Kritzman 1983;Presly 1984), but has also led to B. allii populations that have become resistant against active compounds such as benomyl and carbendazim (Gladders et al 1994;Kritzman 1983;Viljanen-Rolinson et al 2007). Nowadays, fungicide sprays with the active ingredients fluopyram, tebuconazole, boscalid and pyraclostrobin, are commonly applied in onion cultivation and are simultaneously effective against leaf blight as well as against neck rot.…”

Section: Controlmentioning

confidence: 99%

Peeling the onion : Unravelling the biology of fungal onion pathogens causing leaf blight,neck rot and white rot

Steentjes¹

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Botrytis squamosa, Botrytis aclada and Sclerotium cepivorum are three fungal species of the family Sclerotiniaceae that are pathogenic on onion. Despite their close relatedness, these fungi cause very distinct diseases, respectively called leaf blight, neck rot and white rot, which pose serious threats to onion cultivation. The infection biology of particularly neck rot and white rot is poorly understood. In this study, we used GFP-expressing transformants of all three fungi to visualize the early phases of infection. B. squamosa entered onion leaves by growing either through stomata or into anticlinal walls of onion epidermal cells. B. aclada, known to cause post-harvest rot and spoilage of onion bulbs, did not penetrate the leaf surface but instead formed superficial colonies which produced new conidia. S. cepivorum entered onion roots via infection cushions and appressorium-like structures. In the non-host tomato, S. cepivorum also produced appressorium-like structures and infection cushions, but upon prolonged contact with the non-host the infection structures died. With this study, we have gained understanding in the infection biology and strategy of each of these onion pathogens. Moreover, by comparing the infection mechanisms we were able to increase insight into how these closely related fungi can cause such different diseases.

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