Interplay of environmental variables and seasonal trends on cabbage pests

AbstractThe highest incidence of Plutella xylostella was observed on the cabbage crop at the 5th SMW (2.99 larvae plant-1) and the lowest at the 49th SMW (0.90 larvae plant-1). The maximum incidence of Crocidolomia binotalis was recorded at 5th SMW (3.51 larvae plant-1) and minimum was at 49th SMW (0.40 larvae plant-1). The maximum incidence of Spodoptera litura was at the 1st SMW (4.10 larvae plant-1), and minimum was at the 49th SMW (0.60 larvae plant-1). The peak population of aphid was observed at 3rd SMW (36.30 aphid leaf-1) and lowest was observed at 50th SMW (1.40 aphid leaf-1). The populations of diamondback moth, tobacco caterpillar, leaf webber, and aphid exhibited a significant positive correlation with relative humidity and significant negative correlation with maximum temperature. Leaf Webber’s population also showed a negative significant correlation with minimum temperatures.