Studies on plant parasitic nematodes associated with Kinnow in Haryana and their management
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Date
2022-05
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Chaudhary Charan Singh Haryana Agricultural University hisar
Abstract
Present investigations were carried out for studying plant parasitic nematodes associated with Kinnow in Haryana and their management. Survey of Hisar, Fatehabad and Sirsa districts conducted during 2019-20 and 2020-21 revealed the occurrence of four major plant parasitic nematodes viz., Tylenchulus semipenetrans, Helictylenchus dihystera and Hoplolaimus indicus in Kinnow orchards. Among them, H. dihystera had highest frequency of occurrence (90.1%) but T. semipenetrans was the most dominant species. It had 45.6, 57.1, 97.7 per cent frequency of occurrence, relative density and absolute density, respectively. In all the three districts, H. dihystera had the highest frequency i.e., 72.4, 80, 70.3 per cent in Hisar, Fatehabad and Sirsa, respectively. Citrus nematode had maximum frequency (62.9 %) form Sirsa district. Correlation of T. semipenetrans with electrical conductivity (r = 0.07NS), soil pH (r = 0.22 NS), soil organic matter (r = 0.21 NS) and orchard age (r = 0.30 NS) were non-significant. Correlation between Pratylenchus coffeae and ecological factors were also non singnificant i.e., for EC (r=0.23), soil pH (r = 0.30), soil organic matter (r = -0.22), orchard age (r = 0.24). Population of H. dihystera showed no correlation with soil organic matter, weak positive correlation with EC (r = 0.17NS) and pH (r = 0.14NS) and moderate positive correlation with orchard age (r = 0.38NS). Similarly, H. indicus correlations with ecological factors were non-significant. Seasonal fluctuation and vertical distribution of plant parasitic nematodes associated with Kinnow was studied at four locations viz., Horticulture research farm, CCS HAU, Hisar, Malapur, Nangthala and Arya nagar. Maximum number of phytonematodes were recorded in November (2020) followed by March (2021) and lowest in July (2021). More number of nematodes were present at 15-20 cm soil depth as compared to 21-30 cm and 31-45 cm depth. Experiments on management were done at Malapur during 2020-21 and at Horticulture research farm, CCS HAU, Hisar during 2021-22. Application of neem cake @ 1.5 kg, T. viride @ 200 g and neem cake @ 1 kg with T. viride @ 100 g per plant significantly reduced the nematode population and increased the yield significantly over control.