Rice harvest

White Papers

 

Each white paper explains what the disease is, the nature of resistance to the disease, how to work with strains or races of the pathogen causal agent, how to evaluate resistance and susceptibility to a pathogen strain or race in a seedling test and how to identify the pathogen strain or race in question. In addition, each white paper lists contacts for ordering seeds and reference pathogen strains or races.  

Watermelon

Melon Fusarium wilt

Guidelines for identification of Fusarium oxysporum f. sp. melonis races using differential hosts

Watermelon

Watermelon Fusarium wilt

Guidelines for identification of Fusarium oxysporum f. sp. niveum races using differential hosts

Pepper

Pepper Bacterial leaf spot

Guidelines for identification of Pepper Bacterial leaf spot (Xanthomonas spp.) races using differential hosts

Spinach

Spinach Downy mildew

Guidelines for identification of Spinach Downy mildew: Peronospora effusa races using differential hosts

Tomato

Tomato Mosaic virus

Guidelines for identification of Tomato mosaic virus strains using differential hosts

Cabbage

Lettuce Downy mildew

Guidelines for identification of Lettuce Downy mildew: Bremia lactucae races using differential hosts

pepper

Tomato spotted wilt in pepper

Guidelines for identification of Tomato spotted wilt virus strains in pepper using differential hosts

Tomato

Tomato spotted wilt in tomato

Guidelines for identification of Tomato spotted wilt virus strains in tomato using differential hosts

pepper

Pepper Tobamoviruses

Guidelines for identification of pepper Tobamoviruses by group using differential pepper hosts

Brown to grey discoloration on and in fruits of stressed hybrid ToMV resistant cultivars.
Highlighted Diseases
Brown to grey discoloration on and in fruits of stressed hybrid ToMV resistant cultivars.
Light green to yellow angular spots on upper lettuce leaf surface.
Light green to yellow angular spots of downy mildew on upper lettuce leaf surface.
Sporulation of Peronospora farinosa f.sp. spinaciae on a true leaf of an inoculated spinach seedling, representing a susceptible reaction to that race of the pathogen.
Sporulation of Peronospora farinosa f.sp. spinaciae on a true leaf of an inoculated spinach seedling, representing a susceptible reaction to that race of the pathogen.
Infiltration of a leaf is accomplished by gently forcing the bacterial suspension into the underside of the leaf using a sterile syringe without a needle.
Pepper bacterial spot infiltration inoculation of a leaf is accomplished by gently forcing the bacterial suspension into the underside of the leaf using a sterile syringe without a needle.
Melon seedlings incubating in a growth room after inoculation with Fusarium oxysporum f.sp. melonis.
Melon seedlings incubating in a growth room after inoculation with Fusarium oxysporum f.sp. melonis.
Sporulation of Peronospora farinosa f. sp. spinaciae on a true leaf of an inoculated spinach seedling, representing a susceptible reaction to that race of the pathogen.
Sporulation of Peronospora farinosa f. sp. spinaciae on a true leaf of an inoculated spinach seedling, representing a susceptible reaction to that race of the pathogen.