Eggs exposure to low temperature reasons dwindled viability and impeded biology in green lacewing (Chrysoperla carnea Stephen)

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Research Paper 01/05/2018
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Eggs exposure to low temperature reasons dwindled viability and impeded biology in green lacewing (Chrysoperla carnea Stephen)

Mubasshir Sohail, Qadeer Ahmed Soomro, Raza Muhammad, Muhammad Usman Asif, Waseem Akbar, Muhammad Ismail
Int. J. Biosci.12( 5), 204-212, May 2018.
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Green lacewing, Chrysoperla carnea Stephens (Neuroptera: Chrysopidae) is a well-known generalist predator. Integrated pest management (IPM) strategies for various crops belongs to its predatory performance. The possibility of storing Chrysoperla eggs at low temperature and the effects of storage on viability, emergence, quality of predator and its progeny were tested. Eggs were stored in full darkness up to a month at 10 ± 1°C, RH = 40 ± 5%. Percent hatching, incubation period, larval duration, pupal duration, pupal weight and percent adult emergence were evaluated after every 24 hours. Hatching were endured only 51.25% just after seven days of cold storage. However, 100 % eggs viability were lost after 18th day. In incubation period, 20.7 and 41.4% increase was observed at 7th and 18th day of cold storage respectively. Larval duration was increased six hours at 7th day. However, this increase extended up to 24 hours. Big upsurge was found in pupal period during last 7 days, which raised up to 42 hours as compared to control. Considerable reduction was found in pupal weight as cold storage increased and on average it recorded up to two milligrams/pupae. Percent emergence was significantly reduced as cold storage days increased. However, 2-18% reduction was recorded during the studies. No significant effects were found on hatching of F1 and F2 progenies. The results of this study reveal that for more efficient biological control, there is an urgent need to improve the method of storing eggs of C. carnea.


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