Chloropicrin Soil Fumigation Reduces Spongospora subterranea Soil Inoculum Levels but Does Not Control Powdery Scab Disease on Roots and Tubers of Potato

The effect of chloropicrin fumigation on the soil populations of Spongospora subterranea and the development of powdery scab, formation of root galls and tuber yield was investigated in seven field trials conducted in Minnesota and North Dakota. Sixteen potato cultivars, with different levels of sus...

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Bibliographic Details
Published in:American journal of potato research 2017-04, Vol.94 (2), p.129-147
Main Authors: Bittara, Francisco G., Secor, Gary A., Gudmestad, Neil C.
Format: Article
Language:English
Subjects:
Agriculture
Bioassays
Biomedical and Life Sciences
Cultivars
Deoxyribonucleic acid
DNA
Environmental conditions
Fumigation
Life Sciences
Plant Breeding/Biotechnology
Plant Genetics and Genomics
Plant Pathology
Plant Sciences
Potatoes
Roots
Soils
Vegetables
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Summary:The effect of chloropicrin fumigation on the soil populations of Spongospora subterranea and the development of powdery scab, formation of root galls and tuber yield was investigated in seven field trials conducted in Minnesota and North Dakota. Sixteen potato cultivars, with different levels of susceptibility to disease on roots and tubers, were planted in plots treated with chloropicrin at rates ranging from zero to 201.8 kg a.i. ha −1 . The amount of S. subterranea DNA in soil was determined using qPCR. Bioassays were conducted to further assess the effect of chloropicrin fumigation on root colonization by S. subterranea in two potato cultivars with contrasting disease susceptibility. In the field, chloropicrin applied at rates between 70.1 to 201.8 kg a.i. ha −1 significantly decreased S. subterranea initial inoculum in soil but increased the amount of disease observed on roots and tubers of susceptible cultivars. The effect of increasing disease was confirmed in controlled conditions experiments. Although the amount of S. subterranea DNA in roots of bioassay plants increased with increasing chloropicrin rates, it remained similar among potato cultivars. Chloropicrin fumigation significantly increased tuber yield which in cultivars such as Shepody and Umatilla Russet were associated with the amount root galls ( r  = 0.30; P  
ISSN:1099-209X
1874-9380
DOI:10.1007/s12230-016-9555-z