During the last few decades, cole crops production are severely affected by diamondback moth (DBM), Plutella xylostella infestation as this insect developed multiple resistance to commonly used insecticides resulting in population outbreak, causing devastation and complete crop loss throughout the world. The use of manipulating integrated methodologies are reducing the host plant resistant and natural enemies and also increasing the production cost. The failure of all management strategies forced to study thermo regulatory, tritrophic relationship of development of DBM with host plant and environmental condition. The present monographs deals with the population dynamics and life table studies of DBM, estimation of thermal threshold level, and calculation of degree days at different temperature and host plants in laboratory and field conditions.
