Some new findings concerningPhytophthora infestans (Mont.) De By
- 8 Downloads
This paper records the findings of experimental work conducted during the past six months on various phases of investigation relative to the development and behavior ofP. infestans (Mont.) De By.
The present paper confirms the existence of race (1,2,3,4).
Improvements in the blight testing technique and apparatus are described.
Information relative to the behavior of the fungus under definite environmental conditions has established some obscure host-parasite relationships of the organism.
Evidence is presented to show that certain differential hosts proposed in the International System, possibly, are not genotypic equivalents. The difficulties of designating races by this System are indicated.
The erratic behavior of monozoosporous isolates is attributed to discriminatory faults in the differential series rather than to heterogeneity in the isolates.
The results of testing some parental materials and hybrids with race (1,2,3,4) are presented.
KeywordsAMERICAN Potato Journal Phytophthora INFESTANS Late Blight Resistance Differential Host Differential Series
Unable to display preview. Download preview PDF.
- 2.DeBruyn, H. L. G. 1926. The overwintering ofPhytophthora infestans (Mont.) De By. Phytopath. 16: 121–140.Google Scholar
- 3.— 1951. Pathogenic differentiation inPhytophthora infestans (Mont.) De By. Phytopath. Z. 18: 339–359. Cited in R.A.M. 32: 206–207, 1953.Google Scholar
- 5.Wallin, J. R. 1953. The production and survival of sporangia ofPhytophthora infestans on tomato and potato plants in the field. Phytopath. 43: 503–508.Google Scholar