Influence of weather factors on the abundance and population dynamics of Spodoptera litura F. and Pieris brassicae L. on cabbage

Abstract

In order to study the influence of weather factors on the abundance and population dynamics of Spodoptera litura F. and Pieris brassicae L. on cabbage, a field experiment was conducted. Larval population of S. litura ranged from 0.56 to 1.57 larvae/plant during 8 January to 12 February 2014 crop season while the highest peak was on 5 February 2014 (1.57 larvae/plant) at 29.5 0 C temperature. In case of Pieris brassicae, larval population ranged from 0.58 to1.98 larvae/plant and the highest peak of P. brassicae was also on 5 February. The highest peak was on 5 February 2014 at 96% and 38% relative humidity of both maximum and minimum categories and the highest peak of P. brassicae was on 5 February. There was a strong positive correlation (r = 0.824 and r = 0.920) between population of Spodoptera litura and temperature (maximum and minimum). On the other hand, there was a negative correlation (r = -0.439) between population of S. litura and maximum relative humidity and a strong negative correlation (r = -0.716) between population of S. litura and minimum relative humidity. The population of Pieris brassicae was positively correlated (r = 0.899 and r = 0.956) with maximum and minimum temperatures. There was a negative correlation (r = -0.443) between population of P. brassicae and maximum relative humidity and a strong negative correlation (r = -0.645) between population of P. brassicae and minimum relative humidity.

Seasonal Incidence and Management of Cabbage White Butterfly, Pieris brassicae (Linnaeus) (Lepidoptera: Pieridae) on Cabbage Crop

“…However, maximum and minimum temperature had negative effect on their population, as the correlates were highly significant and negative. However, the present findings are in contradiction with those of Khan and Talukder (2017) who found that the population of P. brassicae was positively correlated with maximum and minimum temperatures while negative correlation with maximum relative humidity and a strong negative correlation minimum relative humidity.…”

Effect of weather parameters on the seasonal dynamics of tobacco caterpillar, Spodoptera litura (Lepidoptera: Noctuidae) in castor in Telangana State

“…The results revealed that moth catches and larval population of S. litura (each) had significant positive correlation with maximum temperature (r=0.461 and 0.523, respectively), minimum temperature (r=0.613 and 0.422, respectively), rainfall (r=0.711 and 0.444, respectively) and rainy days (r=0.703 and 0.406, respectively).The egg-masses of S. litura showed significant negative correlation with morning relative humidity (r = -0.768) and minimum temperature (r= -0.624). This finding was in confirmation with the reports of Khan and Talukder (2017), Radhika (2013) and Prasannakumar et al (2012) who reported strong positive correlation of temperature (minimum and maximum) and negative correlation of relative humidity (morning and evening) with the population of S. litura in cabbage, groundnut and potato.…”

Variability of Fusarium verticillioides Isolates causing Maize Post Flowering Stalk Rot with Respect to Growth Parameters on Culture Media

“…These results agreed with those of Mitchell et al, (1991) who reported that in the tropics, S. frugiperda populations have a tendency to vary with changes in rainfall. Khan and Talukder (2017) reported a significant negative correlation between larval population of diamondback moth and rainfall.…”