D. HRISTOVA and S. MANEVA
Plant Protection Institute, BG-2230 Kostinbrod, Bulgaria
HRISTOVA, D. and S. MANEVA, 2002. Influence of cucumber mosaic virus on tomato growth and fruiting. II. Field experiment. Bulg. J. Agric. Sci., 8: 507–513
The study was conducted under field conditions at the Plant Protection Institute, Kostinbrod, in the course of three years. The effect of Cucumber Mosaic Virus on tomato growth and fruiting performance was examined with infection applied at different stages of plant development, ranging from cotyledons to early fruit-produce. The tomato plants inoculated in the earliest development stages (cotyledons and 2nd true leaf) reached only 45–46% of the healthy plants' height, while those ones infected in the fruiting stage arrived to 96–98%. The mass of tomato plants' stem, infected at different age, ranged from 48% to 89%, while the roots' weight changed from 51% to 89% of the respective values in non-inoculated plants. Serological proofs were obtained that the virus reached the highest concentrations in plants infected from the cotyledon stage to the 4th true leaf stage. The growth depression index dropped from 55% to 17% and the fruiting one – from 65% to 12%, which depended on the tomato plants age at the time of inoculation. The intensity of virus infection effect on tomato plants was found to depend on the stage of development when inoculation was done.