Abstract:
An investigation of the effects of temperature and of zinc on
development of tobacco mosaic virus (TMV) in resistant and susceptible
varieties of tomatoes was conducted under greenhouse conditions.
The study included two experiments, one run during late winter and
early spring, and the other during late spring and summer, 1963.
Each experiment comprised four treatments and two temperatures.
Increase in temperature tended to increase virus concentration,
although the differences were not significant. Fresh weights of
the tomato plants were found to be greater at lower temperatures.
Zinc foliar sprays resulted in higher virus concentrations and
in production of increased numbers of local lesions. Effects of zinc
on fresh weights were not significant.
The varieties Hawaii 6832 and OSU-8 were found highly resistant
to the common strain of TMV. California 62 PM 22 was shown to
be heterozygous for resistance to this strain of TMV. OSU 435-4 was
highly susceptible.
