University Department of Zoology, Ranchi University, Ranchi, Jharkhand, India
Received : 25th June, 2021 ; Revised : 02nd August, 2021
Abstract– Degree-days constancy is mathematical representation of product of variable temp. Lifecycle completed in different seasons of a year surprisingly, the product value exhibits feature of constancy with negligible variation in any insect. As a matter of fact, the life cycle of insect is greatly governed by the prevailing temperature which is measure of heat energy expressed in either degree C or F. Coccinella septumpunctata, lady bird beetles are basically of visible size with brilliant colours and less motility. Starting from agriculture field to the economic crops of vegetables and cereals, varieties of lady bird beetle populations can be easily found thriving on the wide range of floristic leaves & twigs having aphid pest infestation. In the present research work it has been observed by closed monitoring of the life cycle duration of Coccinella septumpunctata, reared in the lab throughout the year 2019 & 2020 that the value of degree days constancy is 580±5.
Key words: Seasonal temperature, RH, Lifespan, Degree days product