www.IndianJournals.com Members Copy, Not for Commercial Sale Downloaded From IP - 14.139.226.146 on dated 24-Sep-2013 237 Short Communication Resistance Response of Tomato Genotypes Against Root-Knot Nematode, Meloidogyne incognita N. RAI, SATYENDRA SINGH, A.B. RAI AND R.K. SINGH Indian Institute of Vegetable Research, Varanasi-221 305, U.P., India E-mail: suresat@gmail.com Plant parasitic nematodes are obligate parasites of plants and cause severe damage to many crops worldwide. Root-knot nematode, Meloidogyne incognita is one of the major constraints in production of vegetables and has been considered the most damaging of ten genera of plant parasitic nematodes worldwide (Sasser & Frackman, 1987). Among vegetable crops, tomato (Lycopersicon esculentum Mill.) is most commonly grown vegetable crop in the world only after potato. Root-knot nematode, M. incognita was ranked first in India due to its deleterious effect on economically important crop plants (Sharma et al, 2002), its damage potential in tomato is also very high (27.21% yield loss), monetary loss was calculated up to Rs. 2204 million (Jain et al, 2007). The avoidable yield loss of tomato to the extent of 46 % due to M. incognita infestation has been reported in Mahendragharh district of Haryana (Bhatti & Jain, 1977). Tomato hybrids, resistant to root knot nematode have better economical yield than open pollinated variety in root knot infested area (Kalloo et al ., 1992). Unfortunately there is no full proof management strategy so far to check this nematode pest. Since farmers/ growers do not have practical solution, now a days’ integrated nematode management (INM) is gaining importance in which resistance against plant parasitic nematodes is given top priority coupled with eco friendly approaches for management of nematode diseases. Keeping this backdrop in view thirty five tomato genotypes were evaluated under screen house at IIVR, Varanasi against root-knot nematode, M. incognita. In search of resistance all the genotypes were screened for resistance against M. incognita in 15 cm dia earthen pots containing 500g sterilized soil-sand mixture. Five tomato seedlings were transplanted for each genotype in the first week of November. After establishment of seedlings nematode inoculations were made by making 3-4 holes around each plant @ 2 J 2 /g Table 1. Grouping of genotypes based on DMR test Variety Mean number of galls* ArkaVikash 74.33 ghi DVRT-2 77.00 ghi EC-398405 (L. pimpinellifolium) 97.00 fghi EC-52004 (L. cheesmanii) 61.33 ghi EC-520044 (L. cheesmanii) 89.33 ghi EC-520049 (L. Chmeilwskii) 48.33 ghi EC-520060 (L. hirsutum) 102.00 fghi EC-520061 (L.hirsutum) 169.00 cdef EC-520065 (L. pimpinellifolium) 209.33 bcd EC-520070 (L. pimpinellifolium) 16.67 j EC-520077 (L. pimpinellifolium) 237.00 abc EC-520078 (L. pimpinellifolium) 64.00 ghi EC-521080 (L. pimpinellifolium) 116.67 efg EC-528372 (L. ceraseforme) 100.00 fghi FLA-7421 74.33 ghi H-24 79.33 ghi H-86 80.00 ghi H-88-78-4 46.33 ghi IIHR-2200 59.33 ghi Meghalaya local 34.33 hi PKM-1 58.67 ghi Punjab Chuhara 57.67 ghi Pusa Ruby 109.67 fgh Sel-7 44.33 ghi Sikkim Local 88.67 ghi TLBR-3 45.67 ghi Tura Local 61.00 ghi Vaibhav 54.67 ghi WIR-13706 (L. ceraseforme) 265.67 ab WIR-13708 (L. ceraseforme) 75.33 ghi WIR-3928 (L. glandulossum) 200.67 bcd WIR-3957 (L. peruvianum) 41.67 hi WIR-4360 (L. peruvianum) 202.67 bcd WIR-4361 (L. peruvianum) 308.67 a WIR-5032 (L. chilense) 188.00 cde Note: Superscripts show genotypes in same group based on mean number of galls