Abstract
Life table studies of three mango hopper species in field conditions
Highlights
Life table studies revealed that the surviving fraction (Sx) in the egg stage of Amritodus atkinsoni, Idioscopus clypealis, and Idioscopus niveosparsus, was calculated as 0.94, 0.95, and 0.97; Mortality survival ratio (MSR) were 0.07, 0.05, and 0.04 and Indispensable mortality (IM) were 65, 49 and 35
It is concluded that mortality, apparent mortality, mortality, survival ratio, and indispensable mortality were highest in egg, 3rd, and 4th instars of I. clypealis
The life table was constructed according to the formula described by [12]. x = Stage of the insect lx= Number surviving at the beginning of the stage x dx= Mortality during the stage indicated in the column x 100qx= Apparent mortality Sx= Survival fraction MSR= Mortality survival ratio IM= Indispensable mortality Lx= Log K-value= Killing value The data calculated through the above assumptions were used for computing various life parameters as given below: Apparent mortality (100q) It gives the information on x number dying as a percentage of number entering that stage and was calculated by using the formula; Apparent Mortality = [d / l]×100Survival Fraction (Sx)
Summary
The results presented in (Table 1). indicated the stage-specific life table experiments of mango hopper species, under field conditions. The 3rd instar observation revealed that maximum survival fraction recorded I. neviosparsus 0.96 A. atkinsoni 0.94 and I. clypealis 0.93 after the completion of 3rd instar insect stepped in 4th instar in this instar the peak survival fraction recorded for mango hopper species was I. neviosparsus 0.94 A. atkinsoni 0.93 and I. clypealis 0.93. It was observed that the maximum survival fraction was noted for mango hopper species I. neviosparsus during 1st, 3rd, 4th, and 5th instar while the highest survival fraction during 2nd instar was recorded in A. atkinsoni. Highest mortality in the 5th instar was calculated in 5.73 % I. clypealis followed by A. atkinsoni 5.63 % and I. neviosparsus 5.10 % These results revealed that the highest mortality percentage throughout the observation was in I. clypealis, which happened in all instars. The lowest mortality percentage during 1st, 3rd, 4th and 5th instar was counted in I. neviosparsus whereas the minimum mortality percentage for 2nd instar was recorded in A. atkinsoni
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
