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Author: Sharma, Lochan × Start date: 1997 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Studies on interaction between Heterodera avenae and Urocystis agropyri causing flag smut in wheat
    (CCSHAU, 2019) Sharma, Lochan; Kanwar, R.S.
    Present study was conducted to investigate the effect of different soil types on interaction of Heterodera avenae and Urocystis agropyri, the effect of sowing times on interaction between H. avenae and U. agropyri and the effect of different nematode inoculum levels on interaction of H. avenae and U. agropyri. The experiments were conducted in screen house of Department of Nematology, CCSHAU, Hisar during Rabi-2018. For evaluating the effect of different soil types on interaction between H. avenae and U. agropyri wheat cultivar HD2967 was sown in 1 kg earthen pots and observations of plant growth parameters, disease incidence and nematode population were recorded at crop maturity. Chlorophyll was measured by SPAD meter. Plant growth parameters and chlorophyll was minimum in H. avenae and U. agropyri simultaneous inoculation in loamy sand soil. There was no effect on germination and tillering by either of the pathogen. Final cyst population was more in loamy sand soil and in presence of fungus nematode population was decreased. For comparing the effect of different sowing times, wheat was sown in first week of November, last week of November and second week of December. Maximum reduction in plant growth parameters and chlorophyll was observed in simultaneous inoculation of nematode and fungus in last week of November. Maximum reduction of chlorophyll was observed 60 days after sowing in N+F as compared to uninoculated control. There was no effect of either pathogens alone or in combination on germination and tillering. Maximum cyst population was recorded in last week of November sown plants. In the experiment on effect of different inoculum levels viz. 5, 10 and 15 eggs and J2/g soil of H. avenae and constant level of U. agropyri 20g/kg seed on plant growth parameters and chlorophyll content, plant height, weight and chlorophyll were minimum in simultaneous inoculation of at 15 eggs and J2 of nematode with fungus. Maximum cysts were obtained at highest inoculum of H. avenae i.e. 15 eggs and J2/ g soil. In presence of fungus, cyst population was decreased.