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Greenhouse and field methods were developed to screen  Allium  spp. for resistance to Botrytis leaf blight (caused by  Botrytis squamosa  Walker). In the green-house, plants were sprayed with laboratory-grown inoculum and incubated in a temperature-controlled enclosure containing an atomizing mist system. For field inoculations, a portable misting system with windbreaks was erected, and the plants were sprayed with laboratory-grown inoculum. Greenhouse and field incubation conditions maintained leaf wetness without washing inoculum from the leaves. Botrytis leaf blight symptoms in greenhouse and field evaluations were identical to symptoms in commercial onion fields. A total of 86 selected USDA  Allium  collection accessions were evaluated using these methods. All  A. fistulosum  accessions and  A. roytei  were highly resistant to immune, as were most accessions of  A. altaicum, A. galanthum, A. pskemense , and  A. oschaninii . Nearly all of the  A. vavilovii  and  A. cepa  accessions were susceptible. However, one  A. cepa  accession (PI 273212 from Poland) developed only superficial lesions, which did not expand to coalesce and blight leaves. This work confirms previous reports of Botrytis leaf blight resistance in  Allium  spp., and suggests that strong resistance exists with  A. cepa .

Ccreening Onions (Allium cepa L.) and Other Allium spp. for Botrytis Leaf Blight Resistance