Population Dynamics and Feeding Potential of Cheilomenes sexmaculata (F.) (Coleoptera: Coccinellidae) on Certain Citrus Insect Pests
A study was carried out on the population dynamics and predatory potential of Cheilomenes sexmaculata (F.) on various citrus insect pests at National Research Centre for Citrus, Nagpur, during 2006-10. Visual observation of 3-5 minutes/tree during 2006-08 showed that the population of C. sexmaculata was significicantly higher in February (3.5/tree) and January (2.8/tree) than other month. The population of C. sexmaculata was significantly negatively correlated with wind velocity. Predatory potential studies revealed that each larva of C. sexmaculata consumed a total of 186.1 blackfly (Aleurocanthus woglumi Ashby) nymphs; 208.9 psylla (Diaphosis citri Kuwayama) nymphs and 252.8 aphids (Aphis spiraecola Patch) during 2008; a total of 189.0 blackfly nymphs/206.7. citri nymphs and 242.0 aphids during 2009 and a total of 184.8 A. nymphs/ 198.5 psylla nymphs and 260.2 aphids during 2010. Similarly, each adult of C. sexmaculata consumed a total of 540.5 blackfly nymphs: 660.2 psylla nymphs; 720.6 aphids and 210.3 leaf miner (Phyllocnistis citrella Stainton) pupae during 2008; a total of 538.3 blackfly nymphs, 651.8 psylla nymphs, 708.4 aphids and 216.1 leaf miner pupae during 2009 and a total of 519.5 blackfly numphs, 634.1 psylla nymphs, 695.7 aphids and 201.2 leaf miner pupae during preference of C. sexmaculata larvae and adults to A. spiraecola to other insect pests.
Cheilomenes sexmaculata, Coccinellidae, Predatory Potential and Citrus Insect Pests.
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