Life tables and intrinsic rate of natural increase of Cotesia flavipes (Cam.) (Hymen., Braconidae) population on Chilo partellus (Swin.) (Lep., Pyralidae)

Abstract

The present studies deal with life tables and intrinsic rate of increase of Cotesia flavipes (Cam.), an internal larval parasitoid of Chilo partellus (Swin.). The mated female had an average of 5.8 days ovipositional period and produced an average of 70.5 adult progeny with sex ratio 1.28: 1 (m: f). The maximum mean progeny production per day, mx was 15.6. The innate capacity of increase was 0.176 per female per day and population multiplied to 30.72 times in mean generation time of 19.45 days. Zusammenfassung Lebenstafeln und innere Vermehrungsrate von Cotesia flavipes (Cam.) (Hymen., Braconidae), eines Larven‐Parasitoiden bei Chilo partellus (Swin.) (Lep., Pyralidae) Die befruchteten Weibchen von C. flavipes hatten eine Eiablegezahl von 5,8 Tagen und produzierten i.M. 70,5 adulte Nachkommen mit einem Männchen:Weibchen‐Verhältnis von 1,28: 1. Die maximale mittlere Nachkommenerzeugung pro Tag betrug 15,6. Die Vermehrungskapazität pro Weibchen pro Tag betrug 0,176. Die Population vermehrte sich um das 30,7fache in einer mittleren Generationszeit von 19,5 Tagen.

Life Table and Intrinsic Rate of Increase in Apanteles Agilis Ashmead, a Larval Parasitoid of Diaphania Pulverulentalis (Hampson).

“…The intrinsic rate of increase per female per day was 0.180 (Fig. 1 In Agathis unicolorata (Shenefelt) (Chundurwar, 1977), Cotesia flavipes (Cameron) (Nikam and Sathe, 1983) and in Cotesia orientalis C. & N. and Cotesia diurnii R. & N., (Sathe and Nikam, 1984;Sathe, 1986) the intrinsic rates of increase were 0.144, 0.176, 0.188 and 0.158 respectively. The populations multiplied by 34.56, 30.72, 41.93 and 25.99 times in mean generation time of 24.60, 19.45, 19.87 and 20.61 days respectively.…”

“…Therefore, for hoping ecofriendly control (biological control) of D. pulverulentalis the present work will add great relevance. Review of literature indicates that life tables and intrinsic rate of increase have been studied in different insects by several workers to understand the population ecology (Bilapate and Pawar, 1980) but, very little attention has been paid on Hymenopterous parasitoids (Chundurwar, 1977;Nikam and Sathe, 1983;Sathe and Nikam, 1984;Sathe, 1986, Sathe and Ingawale, 1993. Keeping in view all above facts, the present work was carried out.…”

A Horizontally Transferred Autonomous Helitron Became a Full Polydnavirus Segment in Cotesia vestalis

“…As the T values are given in number of generations, and we were interested in estimate the HT dates in millions of years ago (MYA), two averages for the number of generations per year (gen/yr) were used: one for the D. rhopaloa – C. vestalis (14 gen/yr) and another for the C. vestalis – B. mori (11 gen/yr) HT event. They were based on the known estimates for each taxon: ∼10 gen/yr for the D. melanogaster species group ( Cutter 2008 ; McDonald and Kreitman 1991 ; Tochen et al 2014 ; Asplen et al 2015 ), ∼18 gen/yr for Braconidae ( Nikam and Sathe 1983 ; Nikam and Pawar 1993 ), and ∼4 gen/yr for B. mori ( Maekawa et al 1988 ; Reddy et al 1999 ).…”

A horizontally transferred autonomous Helitron became a full polydnavirus segment inCotesia vestalis

“…As the T values are given in number of generations, and we were interested in estimate the HT dates in millions of years (mya), two averages for the number of generations per year (gen/y) were used: one for the D. rhopaloa -C. vestalis (14 gen/y) and another for the C. vestalis -B. mori (11 gen/y) HT event. They were based on the known estimates for each taxon: ~ 10 gen/y for the D. melanogaster species group (Cutter 2008, McDonald and Kreitman 1991, Tochen et al 2014, Asplen et al 2015, ~ 18 gen/y for Braconidae Sathe 1983, Nikam andPawar 1993), and ~ 4 gen/y for B. mori (Maekawa et al 1988, Reddy et al 1999).…”