This book is useful for plant protection scientists by knowing behavioural pattern and peak period of citrus leaf miner and managing the pest accordingly. Because, in the situation of global climate change, living organisms like insects has capacity to change their behaviour and habitat with the changing of the environment and so, it is necessary to see the impact of changing pattern in abiotic factors on sweet orange leaf miner. To avoid the yield losses caused by this pest at primary stage of crop and encourage cultivation as well as to increase the production and productivity of citrus, our efforts are needed to tackle this pest by knowing the biology, peak period of infestation in relation to the weather parameters and effective insecticides against this pest in field condition. Looking to the above facts in view, a research theme was undertaken as biology, population dynamics and management of leaf miner infesting sweet orange.