Effect of temperature and zinc on development of tobacco mosaic virus in resistant and susceptible tomatoes

Graduation date: 1964An investigation of the effects of temperature and of zinc on\ud development of tobacco mosaic virus (TMV) in resistant and susceptible\ud varieties of tomatoes was conducted under greenhouse conditions.\ud The study included two experiments, one run during late winter and\ud early spring, and the other during late spring and summer, 1963.\ud Each experiment comprised four treatments and two temperatures.\ud Increase in temperature tended to increase virus concentration,\ud although the differences were not significant. Fresh weights of\ud the tomato plants were found to be greater at lower temperatures.\ud Zinc foliar sprays resulted in higher virus concentrations and\ud in production of increased numbers of local lesions. Effects of zinc\ud on fresh weights were not significant.\ud The varieties Hawaii 6832 and OSU-8 were found highly resistant\ud to the common strain of TMV. California 62 PM 22 was shown to\ud be heterozygous for resistance to this strain of TMV. OSU 435-4 was\ud highly susceptible