130 Climate change refers to the phenomenon that is causing the earth to become warmer which means that our climate and our weather systems are changing. Temperature increases- An increase in global mean annual temperatures of 1°C by 2025 and 3°C by the end of the next century.Sea Level Rises- Global mean sea level is estimated to have risen 10- 25cm over the last 100 years.In the next 100 years the average sea level is projected to be about 50cm higher than today. Concentrations of carbon dioxide, (the predominant greenhouse gas) have increased from 280 parts-per-million (ppm) to 383 ppm over the last 150 years (IPCC Report,2004). Impact of temperature on pests Insect pests and most diseases are basically poikilotherms. They require certain minimum temperature to grow. For every species there is well defined temperature. Determines behavior, distribution, survival and reproduction. Effect on the duration of life and rates of reproduction Eg: 50% mortality in bean leaf beetle occurs within 6 minutes at -15 0 C, within 12 minutes at -10 0 C.It has been estimated that with a 2 0 C temperature increase insects might experience one to five additional life cycles per season. In Canada, 50% increase in the average number of adult grasshoppers per square metre (2001), compared to 2000. Above-average temperatures increase the development and maturation. Increases insect pest populations: Temperature can impact insect physiology and development directly or indirectly. Some insects take several years to complete one life cycle -will tend to moderate temperature variability over the course of their life history (cicadas, arctic moths). Degree-day or phenology based models to predict the emergence of insects and their potential to damage crops C.Mohan 1 , G.Yoganathan 2, M. Devi 3 1& 3 Ph.D Scholar Dept. of Agricultural Entomology 2 Ph.D Scholar, Dept. of Soil Science and Agricultural Chemistry Tamil Nadu Agricultural University, Coimbatore-641 003 *Corresponding author:mohanagri638@gmail.com INFLUENCE OF CLIMATIC FACTORS ON PEST INCIDENCE e Journal of Agriculture Science Volume 2, Issue 2, November 2016, Pages 130-134 Received: 19.10.2016; Accepted: 10.11.2016; Online: 26.11.2016