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| Functional Response of Green Lacewing, Chrysoperla carnea (Neuroptera: Chrysopidae) Larvae on Different Insects Pests |
Ameer Uddin, Shafique Ahmed, Arif Ali, Abdul Ghaffar Khoso, Mansab Khan, Farrukh Asghar, Khalil Asghar
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Abstract:
The study was carried out on Functional response of Green lacewing, Chrysoperla carnea (Neuroptera: Chrysopidae) larvae on different insects pests in Department of Entomology at Lasbela University of Agriculture, Water and Marine Sciences, Uthal, Pakistan. Observations on search rate (a'), Handling time (Th), Maximum predation rate (pr) and R2 of Green lacewing on the various densities of different aphids species i.e., cotton aphid (A. gossypii), black bean aphid (A. fabae), wheat aphid (S. graminum), corn leaf aphid (R. maidis) and papaya mealybug (P. marginatus) were recorded under laboratory conditions of 25±2ºC. The larvae of Chysoperla carnea showed type II functional response to different aphids species and papaya mealybug. The highest search rates (á) of first larval instar were of 0.653 and 0.625 on wheat aphid and cotton aphid, while followed by 0.580, 0.480 and 0.231 on corn leaf aphid, black bean aphid and papaya mealybug respectively. The highest search rates (á) of second larval instar were of 0.715 and 0.683 on cotton aphid and wheat aphid, while followed by 0.620, 0.559 and 0.270 on corn leaf aphid, black bean aphid and papaya mealybug respectively. The highest search rates (á) of third larval instar were of 0.834 and 0.727 on cotton aphid and wheat aphid, while followed by 0.711, 0.700 and 0.407 on black bean aphid, corn leaf aphid and papaya mealybug respectively. The C. carnea first larval instar showed maximum handling time on cotton aphid (0.368) and minimum handling time showed on papaya mealybug (0.215). The C. carnea second larval instar showed maximum handling time on corn leaf aphid (0.419) and minimum handling time showed on papaya mealybug (0.240). The C. carnea third larval instar showed maximum handling time on corn leaf aphid (0.462) and minimum handling time showed on papaya mealybug (0.147). The maximum predation rate of C. carnea first larval instar was recorded on cotton aphid (32.86) and minimum predation rate was recorded on papaya mealybug (9.50) respectively. The maximum predation rate of C. carnea second larval instar was recorded on cotton aphid (38.13) and minimum predation rate was recorded on papaya mealybug (11.53) respectively. The maximum predation rate of C. carnea third larval instar was recorded on cotton aphid (46.23) and minimum predation rate was recorded on papaya mealybug (14.43) respectively. The results clearly indicated that C. carnea could be a better biological control agent against different aphid species which are major sucking insect pests of different crops in Pakistan.
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