The field experiments was carried out to study the effect of different doses of nitrogen on the incidence of Hyadaphis coriandri on fennel at the Research farm College of Agriculture, Swami Keshwanand Rajasthan Agricultural University Bikaner, (Rajasthan) during Rabi 2016-17 and 2017-18 by planting fennel variety RF-125. Five levels of Nitrogen, i.e. 50, 75, 100, 125 and 150% were applied. Sampling for aphid, H. coriandari (Das) was done weekly from last February to end of March. The significant increase in the incidence of aphid, H. coriandari has been recorded with increasing application of nitrogenous fertilizers. The maximum incidence of aphid on fennel was observed on 150 % of RDN, while it was minimum with 50 % of RDN and maximum yield was recorded with 100 % of RDN. Highest yield was observed in 100 % RDN whereas, it was minimum was in 50 % of RDN. So in future this could be interesting area for deep study to see the effect of different doses of nitrogen on the incidence of H. coriandari in fennel.

Fennel, aphid, Hyadaphis coriandri, nitrogen and RDN.

Five levels of Nitrogen, i.e. 50, 75, 100, 125 and 150% were applied. Sampling for aphid, H. coriandari (Das) was done weekly from last February to end of March. The significant increase in the incidence of aphid, H. coriandari has been recorded with increasing application of nitrogenous fertilizers. The maximum incidence of aphid on fennel was observed on 150 % of RDN, while it was minimum with 50 % of RDN and maximum yield was recorded with 100 % of RDN

Renu Choudhary, H.L. Deshwal, Bishana Ram and Amar Chand (2022). Evaluation of Different Doses of Nitrogen on the Incidence of Hyadaphis coriandri in Fennel. Biological Forum – An International Journal, 14(2): 568-572.