A field experiment was carried out in Randomized Block Design (RBD) having four replication with five treatment at Experimental Research Farm, Department of Entomology, School of Agricultural Sciences and Rural Development (SASRD), Nagaland University, Medziphema campus during November, 2021 to March, 2022 to study the population dynamics of Cabbage aphid, Brevicoryne brassicae L. on five brassicae species viz., cabbage, cauliflower, broccoli, chinese cabbage and radish and their correlation with abiotic factors. The aphid attacked all the five brassicae crop viz., cabbage, chinese cabbage, cauliflower, broccoli and radish. The population was low in the beginning but gradually increased and reached its highest peak in the first week (cauliflower and broccoli) and second week of March (cabbage, chinese cabbage and radish) and found till the harvesting of the crop. The aphid was found to be most prevalent on cabbage (3.80 aphids/plant) followed by broccoli (2.78 aphids/plant), cauliflower (2.58 aphids/plant), chinese cabbage (0.93 aphids/plant), and radish (0.93 aphids/plant). Correlation analysis indicated that aphid population had positive significant correlation to temperature (°C), negatively significant to relative humidity (%) but non-significant to rainfall in cabbage and chinese cabbage. While, in Cauliflower and broccoli, it was found to have positive significant correlation with maximum temperature, negative with minimum relative humidity and non-significant with other weather parameters. In radish, the aphid population was significantly positive correlated with maximum temperature and negative with relative humidity.

Population dynamics, Brevicoryne brassicae, cabbage, chinese cabbage, cauliflower, broccoli, radish

The finding of the present study indicate that Cabbage aphid, Brevicoryne brassicae attacked all the five brassicae crop. The Cabbage aphid population was recorded highest on cabbage crops followed by broccoli, cauliflower, Chinese cabbage and radish. Cabbage and Chinese cabbage were found to be positively significant correlation to temperature (°C), negatively significant to relative humidity (%) but non-significant to rainfall. Where as in Cauliflower and broccoli had shown positive significant correlation with maximum temperature, negative with minimum relative humidity and non-significant with other weather parameters. While in radish, the aphid population was significantly positive correlated with maximum temperature and negative with relative humidity.

Jesonkere Sutnga, H. Shila Devi, Imtinaro L., Damitre Lytan, Waluniba, Susanta Banik and Sabbithi Pavan (2024). Population Dynamics of Cabbage aphid, Brevicoryne brassicae L. on Five Brassicae species viz., Cabbage, Cauliflower, Broccoli, Chinese cabbage and Radish. Biological Forum – An International Journal, 16(1): 47-52.