Biology and feeding potential of Coccinella septempunctata (Linn.) against Lipaphis erysimi (Kalt) at different temperature regimes

Abstract

Biology and feeding potential of Coccinella septempunctata (Linn.) were studied in laboratory on 3rd instar nymphs of mustard aphid (Lipaphis erysimi Kalt.) at two different temperature regimes. At 30± 20C, fecundity, oviposition period, hatchability of eggs, male and female longevity (232±70.46, 12.8±3.91, 82.87±6.66, 22.70 ± 2.21and 26.60 ± 4.45, respectively) were higher and incubation period, pre-oviposition period, total grub duration and pupal duration (2.6±0.51, 6.5±3.53, 8.7 ± 1.63 and 5.1 ± 1.10, respectively) were lesser in comparison to 25± 20C where fecundity, oviposition period, hatchability of eggs, male and female longevity, incubation period, preoviposition period, total grub duration and pupal duration were 169.8±61.12, 7.9±1.37, 71.68±4.08, 16.2 ± 1.31 and 21.50 ± 1.95, 2.9±0.73, 7.7±2.49, 11.1 ± 1.52 and 5.8 ± 0.918, respectively . At 27± 2 0C, total mustard aphid consumption by a grub of C. septempunctata during the whole life span, was 424.4±2.78 mustard aphids in comparison to 272.64±1.79 mustard aphid at 23± 20C. Similarly an adult male and female consumed 103.2±1.52 and 116.6 ±1.46 aphids per day respectively at 27± 2 0C in comparison to 65.6 ± 1.02 and 71.8 ± 1.60 at 23± 20C. Thus, at both temperatures aphid consumption increased gradually till 4th instar and 30±20C was found to be most suitable temperature as compared to 25±20C for the life history of C. septempunctata. Hence, it could be concluded that C. septempunctata might play a suitable role in biointensive Integrated Pest Management programme because of better longevity and high predatory potential against the mustard aphid.

Biology and Predatory Potential of <i>Coccinella septempunctata</i> And <i>C. Transversalis</i> feeding on<i> Lipaphis erysimi</i>

“…Pareek et al (2014) observed similar results of 237.37± 88.37 aphids as average consumption by fourth instar grub of C. septempunctata when reared on coriander aphid, Hyadaphis corriandri. The total number of aphids consumed during larval period was found to be 424.4± 2.78 aphids which is in agreement with the findings of Varshney et al, (2016) who reported total number of aphids consumed during larval period was 424.4± 2.78 aphids at 27± 2 0 C and in contrary when same was recorded at 23± 2 0 C, which was recorded to be 272.64± 1.19 aphids (Table 2).…”

“…The pre-oviposition period of C. septempunctata on mustard aphid, L. erysimi under laboratory conditions was varied from 4 to 13 with an average 7.92± 2.45 days. Varshney et al, (2016) reported pre-oviposition period to be 6.5± 3.53 days. The present studies revealed that oviposition of C. septempunctata on mustard aphid, L. erysimi under laboratory conditions was 13 to 26 days with an average of 21.6± 3.39 days and also reported oviposition period of C. septempunctata on mustard aphid, L. erysimi to be 12.8± 3.91 days.…”

Comparative biology and predatory potential of ladybird beetle, Coccinella septempunctata at different temperature regimes

“…The maximum number of aphids consumed by an adult was found in the treatment T 3 (556.33±2.84) and minimum in the treatment T (493.33±15.28), 5 while consumption by an adult in the remaining treatments were 510.33±7.18, 544.50±10.33 and 546.00±10.15 at temperature 20±2ºC, 25±2ºC and 35±2ºC and relative humidity 65-70%. The result is in conformity with the findings ofVarshney et al (2016) th who reported 4 grub and total grub instar consumption was 238.82±1.11 and 424.4±2.78 at 27± 2°C, 65±5% relative humidity. While the result is in partial conformity similar findings asMishra and Kanwat (2017) who reported that adult consumption…”

“…Su Wang et al (2013) also reported that variables temperature significantly affects the biological parameters of C. sexmaculata. Varshney et al (2016) also stated that the mean fecundity, incubation and hatchability percentage was 232±70.46, 2.6±0.51 and 82.87±6.66, respectively at 30 ± 2°C.…”

Feeding potential of Coccinella septempunctata Linn. on mustard aphid, Lipaphis erysimi Kalt.

“…Similarly, (Singh et al, 2011) reported that the grub of C. septempunctata consumed 549.11 aphids in its total developmental period. (Varshney, Rachana and Bisht, 2016) reported that C. septempunctata feeds 424.4±2.78 aphids during its entire larval period. (Mishra and Kanwat, 2017) observed that the grub of C. septempunctata required 610.25 aphids for completion of larval development.…”