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Influence of Weather Factors on the Abundance and Population Dynamics of Spodoptera Litura F. and Pieris Brassicae L. on Cabbage

M.M.H. Khan*
Department of Entomology, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

S. Talukder
Ispahani Mirzapur Tea Estate, Srimongal, Moulavibazar, Sylhet, Bangladesh

Abstract/ Executive Summary:

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 ⁰C 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.

Keywords: Cabbage, Spodoptera litura, Pieris brassicae, Weather parameters

Location: At agricultural farm of Patuakhali Science and Technology University, Dumki, Patuakhali

Start Date: 00-11-2013

End Date: 00-04-2014

Program Area: Pest Management

Commodity: Insects, Cabbage

Objectives:

The present study was conducted to know the abundance and population dynamics of Spodoptera litura F. and Pieris brassicae L. on cabbage in relation to weather parameters

Methodology:

The field experiment was conducted at agricultural farm of Patuakhali Science and Technology University, Dumki, Patuakhali to study the influence of weather factors on the abundance and population dynamics of Spodoptera litura F. and Pieris brassicae L. on cabbage during rabi season of 2013-2014. Two cabbage varieties viz., Atlas 70 (V1) and Super tropic (V2) were included in this study. Experiment was laid out in randomized block design (RBD) with three replications. The entire field was divided into three blocks and each block was again divided into ten plots. The distance between both blocks and plots was 1.0 m. The area of each experimental plot was 9 m². Seeds of the selected cultivars were sown in the month of November and were transplanted in December. Thirty day-old cabbage seedlings were transplanted in the plot of 9 m2 area with 45cm x 45cm spacing on 29 December, 2013. The chemical fertilizers viz., urea, TSP and MP were applied at the rate of 285, 145 and 218 kg ha^-1. Fertilizer, irrigate ion and all other agronomic practices were carried out in the experimental field as and when needed. All inputs for example fertilizer application, irrigation, hoeing and other agronomic practices remained same for all cultivars. Recommended management practices except plant protection measures were followed for raising the crop. Weekly observations were taken since one week of transplanting till maturity of the crop. Observation on population dynamics of Spodoptera litura and Pieris brassicae started as soon as their infestation was noticed. Population density was determined on the basis of number of larvae per plant on randomly selected plants at weekly interval. All the open leaves and heads of the selected plants were observed thoroughly and the larvae found were recorded. Larvae of tobacco caterpillar and cabbage butterfly were counted from randomly selected 10 plants per replication. Meteorological parameters (temperature and humidity) were collected from meteriological office of Patuakhali district and correlated with the population of tobacco caterpillar (Spodoptera litura) and cabbage butterfly (Pieris brassicae) through Microsoft Excel program.

Source of Information: SAARC J. Agri., 15(1): 13-21 (2017)

Article Link (Online Journal): DOI: http://dx.doi.org/10.3329/sja.v15i1.33147

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The highest peak populations of Spodoptera litura and Pieris brassicae were found on 5 February 2014 at 29.5 ⁰C temperature and at 96% relative humidity. Temperature had positive influence on populations of both species while humidity had negative influence on them.

Knowledge Management: Journal