Identification and occurrence of races of Phytophtora parasitica var. nicotianae on dark tobacco

Author

Pedro Ricardo Jones

Date of Award

8-1979

Degree Type

Thesis

Degree Name

Master of Science

Major

Agricultural Biology

Major Professor

Philip P. Hunter

Committee Members

James Hilty

Abstract

In 1978 isolations of Phytophthora parasitica var. nicotianae were made from black shank-infected plants from Tennessee counties where dark fire- and air-cured tobacco are grown. The race of eight representative isolates were identified with the following differential tobacco cultivars: Madole, DF-300, L8 and A23. Seedlings were grown in the green house in artificial media in 12-unit aluminum muffin pans, each supported by an aluminum cake pan. After 14 days the seedlings were inoculated with mycelium, removed and root system indexed for black shank severity. Reaction of known races 0, 1 and 3 were similar to reactions reported previously. Five of the eight unknown isolates were identified as race 0 and three identified as race 1.

Recommended Citation

Jones, Pedro Ricardo, "Identification and occurrence of races of Phytophtora parasitica var. nicotianae on dark tobacco. " Master's Thesis, University of Tennessee, 1979.
https://trace.tennessee.edu/utk_gradthes/7812