Skip to main content

Table 1 Developmental biology of S. pyrastri on cabbage aphid, B. brassicae

From: Biology, predatory potential and growth parameters of the syrphid fly, Scaeva pyrastri (L.) (Diptera: Syrphidae) feeding on the cabbage aphid, Brevicoryne brassicae (L.)

Parameters

Stages (days)

Mean ± SE

(n = 10)

Developmental period

Egg duration

2.70 ± 0.11

First-instar larvae

2.10 ± 0.06

Second-instar larvae

2.45 ± 0.11

Third-instar larvae

3.76 ± 0.11

Pupal period

8.65 ± 0.15

Pre-adult period

19.82 ± 0.25

Adult longevity

Female longevity

18.57 ± 0.37

Male longevity

15.50 ± 0.17

Oviposition and fecundity

Pre-oviposition period (days)

4.25 ± 0.25

Oviposition period (days)

8.50 ± 0.46

Post-oviposition period (days)

3.25 ± 0.31

Fecundity (eggs/female)

37.75 ± 1.16

Sex ratio (M:F)

1: 0.8