A decrease in tomato yield caused by branched broomrape (Orobanche ramosa) parasitization
2003
Cagan, L.,Slovak Univ. of Agriculture in Nitra (Slovak Republic) | Toth, P.,Slovak Univ. of Agriculture in Nitra (Slovak Republic)
In the southwest of Slovakia, tomato is grown as a field plant for the production of juice and paste. Orobanche ramosa L. parasitization was found to affect tomato plants. In 2002-2003, tomato plants parasitized by O. ramosa and non-parasitized plants were compared one month before harvest of fruits. The percentage of tomato plants attacked by O. ramosa in two selected fields was 69% in 2002 and 75% in 2003. In 2003, the tomato field was regularly irrigated. The average number of O. ramosa sprouts per parasitized tomato plant was 9.54 in 2002 and 19.83 in 2003. The average number of fruits per non-parasitized tomato plant was 41.78 and 59.91 in 2002 and 2003, respectively, while that of fruits per parasitized plant was 16.85 in 2002 and 32.06 in 2003. Mathematical calculation showed that there was an equivalent of 37.93 (2002) or 77.68 (2003) fruits with a diameter of 3 cm per non-parasitized plant and 17.31 (2002) or 43.94 (2003) fruits of the same diameter per parasitized plant. A decrease in the yield of tomato plants caused by O. ramosa parasitization was calculated to be 53.36% (2002) and 43.44% (2003). The yield of tomato fruits per parasitized plant did not correlate with the number of O. ramosa shoots.
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