Root-knot nematode (Meloidogyne javanica) management should be partly based on the knowledge of the threshold density, and this value is likely to vary depending on the resistance level of the tomato cultivars. The damage functions based on four initial population densities (Pi) (0, 1,000, 3,000 and 5,000 egg kg-1 of soil) of root-knot nematode were determined in four tomato cultivars. The experiment was performed in completely randomized design with four replications. The results showed that yield responses to Pi were fitted properly by a log-logistic function with three parameters. The most susceptible cultivar was ?Rutgers? based on EP50 and EP10 (effective population of nematodes, reducing 50% or 10% of maximum yield or shoot fresh weight respectively) and three others were relatively resistant. EP10 is more applicable than EP50 because 50% yield reduction is unacceptable in most situations. EP10 for yield of ?Rutgers?, ?Efialto?, ?Falat 111?, ?Gina VF? was 500, 3,021, 2,998, and 3,000 egg kg-1 of soil, respectively. The correlation coefficients among gall index, egg mass and reproductive factors were positively related. Reproduction factor and root gall indices were greater in ?Rutgers? than in the other cultivars (P?0.05). For ?Gina VF? as a relatively resistant cultivar it seemed that increasing of Pi up to 5,000 or more egg kg-1 soil might break its resistance.Kontrola javanske nematode korenovih gala (Meloidogyne javanica) bi trebalo da se delimicno zasniva na poznavanju granicne gustine i moguce je da ova vrednost varira u zavisnosti od nivoa otpornosti sorti paradajza. Funkcije stete zasnovane na cetiri pocetne gustine populacije (Pi) (0, 1.000, 3.000 i 5.000 jaja kg-1 zemljista) nematode korenovih gala su odredjene kod cetiri sorte paradajza. Ogled je izveden po metodu potpuno slucajnog blok sistema u cetiri ponavljanja. Rezultati su pokazali da je odnos prinosa i Pi vrednosti pravilno postavljen loglogistickom funkcijom sa tri parametra. Na osnovu EP50 i EP10 (efektivna populacija nematoda koja smanjuje 50%, odnosno 10% maksimalnog prinosa ili sveze mase izdanka) najosetljivija sorta je bila Rutgers, a tri ostale sorte su bile relativno otporne. EP10 je primenljiviji od EP50 zato sto je 50% smanjenja prinosa neprihvatljivo u vecini situacija. EP10 za prinos sorti Rutgers, Efialto, Falat 111, Gina VF je bio 500, 3.021, 2.998, odnosno 3.000 jaja kg-1 zemljista. Koeficijenti korelacije izmedju indeksa gala, mase jaja i reproduktivnih faktora su bili pozitivni. Faktor reprodukcije i indeksi gala korena su bili visi kod sorte Rutgers nego kod ostalih sorti (P?0,05). Kod Gina VF kao relativno otporne sorte povecanje vrednosti Pi sve do 5.000 ili vise jaja kg-1 zemljista izgleda da moze ponistiti njenu otpornost.
CITATION STYLE
Gharabadiyan, F., Jamali, S., & Komeili, R. (2013). Determining of root-knot nematode (Meloidogyne javanica) damage function for tomato cultivars. Journal of Agricultural Sciences, Belgrade, 58(2), 147–157. https://doi.org/10.2298/jas1302147g
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