Abstract
Predator-prey relationship is of great importance in the agro-ecosystems. Insects being the largest group of arthropods have a major role in designing various management strategies against different crop pests. Theoretically, these interactions influence the structure and dynamics of an agro-ecosystem and the present project is a good example of this .A mathematical model was proposed and analyzed to study the dynamics, of autonomous predator- prey model with a logistic abundance ratio. The major coleopteran predators; Coccinella septempunctata, Coccinella undecimpunctata, Cheilomenes sexmaculata Hippodamia variegata and Calosoma maderae and important hemipteran prey/pests; Schizaphis graminum, Aphis maidis, Macrosiphum miscanthi , Aphis gossypii and Diuraphis noxia were sampled from mixed crop agro-ecosystems of Central Punjab. The study was conducted to find the monthly abundance ratios of each predator species with all of the prey species in wheat, fodder and brassica crops. A graphed horizontal straight line was taken as constant predator-prey relationship. Chi-square test was applied on the relative abundance of a predator with selected prey species. Accordingly, most of the predators in different crops (wheat fodder and brassica) depicted a straight line showing least changes in nearly all monthly samples with S. graminum. By using such results species specific biological control can be implemented against targeted pests of the cropland.

Talat Perveen Inayat, Shahnaz Akhtar Rana, Naureen Rana, Tahira Ruby, Muhammad Javed Iqbal Siddiqi, Muhammad Nadeem Abbas. (2011) Predator-prey Relationship Among Selected Species In The Croplands Of Central Punjab, Pakistan, , Volume-48, Issue-2.
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