Vol. 6, Issue 3 (2018)
Scenario of insect pests under changing climatic situations
Author(s): Sheikh Aafreen Rehman and Ritesh Kumar
Abstract: Climate change refers to a change of climate that is attributed directly or indirectly by human activity that alters the composition of the global atmosphere and climate variability observed over comparable time period. Over past hundred years, the global temperature has increased by 0.80 °C and is expected to reach 1.1-5.4 0C by the end of next century. On the other hand, CO2 concentration in the atmosphere has increased drastically from 280 ppm to 370 ppm and is likely to be doubled in 2100. This change is attributed mainly to the overexploitation and misuse of natural resources for various anthropogenic developmental activities such as increased urbanization, deforestation and industrialization resulting in aberrant weather events like changes in rainfall patterns, frequent droughts and floods, increased intensity and frequency of heat and cold waves. Climate change has been found to bring a number of changes in the insect phenology, distribution, species interactions, biodiversity. Other effects caused by climate change on insects include increase in number of generations, changes in crop pest synchrony, increased over wintering, invasion by migrants, decreasing effectiveness of pest management strategies. The impact of climate change can be positive, negative or neutral, since these changes can decrease, increase or have no impact on insect pests, depending on specific location of each region or period. Temperature affects the larval developmental time, larval survival and adult reproduction depending on the combination of mean temperature and magnitude of fluctuations. Therefore, there is a need to generate information on the likely effects of climate change on insect pests to develop robust technologies that will be effective in future under global warming and climate change.